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Relevant bibliographies by topics / Ceramic cores

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Academic literature on the topic 'Ceramic cores'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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Journal articles on the topic "Ceramic cores"

1

Chiang, Ting-Yi, Chun-Chuan Yang, Yi-Hsuan Chen, Min Yan, and Shinn-Jyh Ding. "Shear Bond Strength of Ceramic Veneers to Zirconia–Calcium Silicate Cores." Coatings 11, no. 11 (October 29, 2021): 1326. http://dx.doi.org/10.3390/coatings11111326.

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Improving the bond strength of veneering ceramics to ZrO2-based cores remains a challenge. The purpose of this study was to evaluate the shear bond strength of different ZrO2 cores containing calcium silicate (CaSi) to veneering ceramics. Five types of ZrO2-based cores (n = 230) were divided into two groups: with or without oxygen plasma treatment. These were bound to two veneering ceramics (IPS e.max Ceram or VITA VM9). Shear bond strength of veneering ceramics to various cores was measured (n = 10), in addition to phase composition, surface morphology and contact angle of the cores. The results indicated that the plasma treatment had a significant effect on the water contact angle of the ZrO2-based cores, but had little effect on the bond strength. Regardless of plasma treatment, the highest strength value was recorded in the ZrO2 core specimen containing 20 wt % CaSi, when all cores were adhered to VITA VM 9 veneer. When using IPS e.max Ceram veneer, the shear bond strength of the plasma-treated 20 wt % CaSi-containing ZrO2 core was 16.6 ± 0.9 MPa higher than that of VITA In-Ceram YZ core control (13.4 ± 1.0 MPa) (p < 0.05). We conclude that the presence of 20 wt % CaSi in ZrO2 can improve the shear bond strength of zirconia-based cores to veneering ceramic.

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Yu, Jian Bo, Zhi Gang Yang, Chuan Jun Li, Kang Deng, and Zhong Ming Ren. "Investigation on Properties of the Silica Ceramic Cores for the Hollow Blades Prepared by the Conversion of the Silicon Resin." Key Engineering Materials 680 (February 2016): 267–71. http://dx.doi.org/10.4028/www.scientific.net/kem.680.267.

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The working conditions of the ceramic cores are extremely harsh with the development of the preparation technology and improvement of the use conditions in the hollow blades, which brings forward high request for the preparation and properties of the ceramic cores. In this paper, silica ceramic powders were firstly coated by the silicon resin. The obtained composite powders were used to prepare the ceramic cores by the dry pressing method. And the phase compositions, microstructure and properties of the ceramic cores with the sintering temperatures were investigated. The results showed that the composite powders prepared by the coating showed good formability. The sintering temperature promoted the formation of the cristobalite. With the increase of the sintering temperature, the porosity of ceramic cores gradually decreased, the shrinkage rate and bulk-density increased. The prepared ceramic cores at 1250°C had highest bend strength of 19.25Mpa.

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Li, Xin, Shuxin Niu, Dongsheng Wang, Jie Li, Qi Jiao, Xinlong Guo, and Xiqing Xu. "Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property." Materials 16, no. 2 (January 8, 2023): 606. http://dx.doi.org/10.3390/ma16020606.

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Silica-based ceramic cores play key roles in the casting of aeroengine blades, but they are highly limited by the poor high-temperature mechanical property. Here, fused mullite (FM) and sintered mullite (SM) powders were modified in silica-based ceramic cores, and the microstructure evolution and crystallization kinetics of ceramic cores depending on mullite types were studied. The ceramic cores with FM showed a dense microstructure and superior mechanical properties compared to those with SM. The ceramic cores with 10 wt.% of FM showed a crystallization activation energy of 1119.5 kJ/mol and a crystallization exponent of 1.74, and the values of 938.4 kJ/mol and 1.86 as SM were employed; the decreased crystallization activation energy and the elevated crystallization exponent by SM suggested that the excess impurities of alkali oxides and alkaline-earth oxides significantly promoted the crystallization of cristobalite. Even though the ceramic cores with mullite powders decreased slightly in the room-temperature mechanical property, their high-temperature flexure strength and creep deformation resistance were enhanced. The ceramic cores with 10 wt.% of FM showed excellent comprehensive performance, with linear shrinkage of 0.69%, room-temperature strength of 18.9 MPa, and high-temperature strength of 15.5 MPa, which satisfied the demands for hollow-blade casting.

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Liu, Xiao-fu, Xin-li Guo, Guo-yan Shui, Chang-chun Li, Gui-qiao Su, Xun Sun, Yang Guan, and Lei Jin. "Properties of alumina-based ceramic cores." China Foundry 18, no. 6 (November 2021): 593–98. http://dx.doi.org/10.1007/s41230-021-1125-4.

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Zheng, Wen, Jia-Min Wu, Shuang Chen, Chang-Shun Wang, Chun-Lei Liu, Shuai-Bin Hua, Kang-Bo Yu, Jie Zhang, Jing-Xian Zhang, and Yu-Sheng Shi. "Influence of Al2O3 content on mechanical properties of silica-based ceramic cores prepared by stereolithography." Journal of Advanced Ceramics 10, no. 6 (September 28, 2021): 1381–88. http://dx.doi.org/10.1007/s40145-021-0513-y.

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AbstractSilica ceramic cores have played an important part in the manufacture of hollow blades due to their excellent chemical stability and moderate high-temperature mechanical properties. In this study, silica-based ceramics were prepared with Al2O3 addition by stereolithography, and the influence of Al2O3 content on mechanical properties of the silica-based ceramics was investigated. The Al2O3 in silica-based ceramics can improve the mechanical properties by playing a role as a seed for the crystallization of fused silica into cristobalite. As a result, with the increase of Al2O3 content, the linear shrinkage of the silica-based ceramics first decreased and then increased, while the room-temperature flexural strength and the high-temperature flexural strength first increased and then decreased. As the Al2O3 content increased to 1.0 vol%, the linear shrinkage was reduced to 1.64% because of the blocked viscous flow caused by Al2O3. Meanwhile, the room-temperature flexural strength and the high-temperature flexural strength were improved to 20.38 and 21.43 MPa with 1.0 vol% Al2O3, respectively, due to the increased α-cristobalite and β-cristobalite content. Therefore, using the optimal content of Al2O3 in silica-based ceramics can provide excellent mechanical properties, which are suitable for the application of ceramic cores in the manufacturing of hollow blades.

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Ozcan, Nihal, and Erdal Sahin. "In vitro evaluation of the fracture strength of all-ceramic core materials on zirconium posts." European Journal of Dentistry 07, no. 04 (October 2013): 455–60. http://dx.doi.org/10.4103/1305-7456.120671.

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ABSTRACT Objective: For most endodontically treated teeth, tooth-colored post-core systems are preferable for esthetic reasons. Therefore, improvements in material strength must also consider tooth colored post-core complexes. The objective of this study was to evaluate the difference in tooth colored post-core complex strengths. Materials and Methods: A total of 33 human maxillary central incisor teeth were used for this study, with three groups of 11 teeth. Three different methods were used to fabricate all-ceramic post-core restorations: zirconia blanks, Cerec 3D-milled to one-piece post-core restorations (Test Group 1); feldspathic cores (from feldspathic prefabricated CAD/CAM blocks) adhesively luted to CosmoPost zirconia posts (Test Group 2); and IPS Empress cores directly pressed to CosmoPost zirconia posts (Test Group 3). All-ceramic crowns from feldspathic ceramic were constructed using a CAD/CAM system (Cerec 3D) for all specimens. The post-core complexes were tested to failure with the load applied at 45° angled relative to the tooth long axis. The load at fracture was recorded. Results: The maximum fracture strength of the milled zirconia cores (Test Group 1) was 577 N; corresponding values for the milled feldspathic cores (Test Group 2) and the pressed cores (Test Group 3) were 586 and 585 N, respectively. Differences were not statistically significant at P < 0.05 (P = 0.669). Conclusions: All-ceramic cores adhesively luted on zirconia posts and one-piece all-ceramic zirconium post-core structures offer a viable alternative to conventional pressing.

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Zhou, Pengpeng, Guoqing Wu, Faheem K. Butt, Ye Tao, Jiaqi Zhao, and Hai Nan. "Preparation of Y2O3 Coated CaO Ceramic Cores with Anti-Hydration Performance and High-Interface Stability Against Interface Reaction of Ti–6Al–4V Alloys." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3420–28. http://dx.doi.org/10.1166/jnn.2019.16034.

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In this study, we describe a novel method for preparing Y2O3@CaO ceramic cores with anti-hydration performance and high-interface stability against interface reaction of Ti–6Al–4V alloys. The effect of Y2O3 coating on microstructure, mechanical, anti-hydration properties of ceramic cores and interface reaction with Ti–6Al–4V alloys was studied. The results show that the surface charge of Y2O3 and CaO are opposite at the pH value of 13, which might result in an electrostatic force and become the main driving force of Y2O3 particles absorb on the surface of CaO particles. The Y2O3 coating improved the anti-hydration properties of the CaO-based ceramic cores after sintering at 1450 °C. Meanwhile, the flexural strength improved from 11.2 to 18.8 MPa. At last, the interaction between the ceramic cores and Ti–6Al–4V metal were studied by centrifugal investment casting. Y2O3 coating can effectively reduce the interface reaction and the thickness of the interaction layer in the casting was less than 10 μm. The results suggest that the Y2O3@CaO ceramic with anti-hydration performance provide excellent mechanical and high-interface stability against interface reaction of Ti–6Al–4V alloys.

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Rassokhina, L. I., O. N. Bityutskaya, M. V. Gamazina, and V. V. Avdeev. "FEATURES OF THE DEVELOPMENT OF TECHNOLOGIES FOR THE MANUFACTURE AND REMOVAL OF CERAMIC CORES BASED ON FUSED QUARTZ FOR CASTING TURBINE BLADES FROM SUPERALLOYS." Proceedings of VIAM, no. 2 (2022): 3–12. http://dx.doi.org/10.18577/2307-6046-2022-0-2-3-12.

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Technological parameters of removal of ceramic cores based on fused quartz from the inner cavity of turbine blade castings are selected and investigated. The results of studies of technological parameters of removal of ceramic cores based on fused quartz are presented, according to the results of which optimal technological parameters are selected and a technology for removing ceramic rods from fused quartz from the inner cavity of turbine blade castings is developed.

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Qin, Ye Xia, Ai Bing Du, Rui Zhang, and Wei Pan. "Properties of In Situ Synthesized Alumina Ceramic Core Composites." Key Engineering Materials 368-372 (February 2008): 724–25. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.724.

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A series of alumina-based ceramic cores were in situ prepared. Effect of kyanite on the properties of ceramic core was discussed. The results indicated that the microstructure of the core is characterized by the presence of unreacted Al2O3 particles having a polycrystalline composition consisting essentially of in-situ synthesized 3Al2O3 .2SiO2 on the surface of the Al2O3 particles. The ceramic cores of kyanite contents sintered at 1500oC for 3 h have almost no creep deformation.

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Vavřičková, Lenka, T. Dostálová, J. Charvát, and M. Bartoňová. "Evaluation of the Three-year Experience with All-ceramic Crowns with Polycrystalline Ceramic Cores." Prague Medical Report 114, no. 1 (2013): 22–34. http://dx.doi.org/10.14712/23362936.2014.35.

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The objective of the study was to evaluate the clinical outcomes of all-ceramic crowns three years after placement of the restoration in the oral cavity. The aim of the present clinical study were surveyed the Procera®, Cercon® and LAVA™ systems. In total, 121 crowns were followed in 33 patients (7 men and 26 women) with an average age of 53.5 years. The eighty crowns were placed in anterior and forty one crowns in posterior teeth. The crowns were fabricated in two dental laboratories and delivered in two private dental practices. The clinical trial was conducted according to American Dental Association guidelines. The patients were requested to provide their consent to the regular clinical examination including radiographic and photographic records. A total of 102 crowns were made of zirconium oxide ceramic cores – 58 Cercon®; 43 LAVA™, while 19 crowns were made of aluminum oxide cores Procera®. The veneering ceramic LAVA™ Ceram was used. The success rate was analyzed using Kaplan-Meier statistics and, in our case, the overall three-year success rate reached 96.7%. All-ceramic crowns with polycrystalline ceramic cores have low susceptibility to fracture, in this study just 3.3%.

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Dissertations / Theses on the topic "Ceramic cores"

1

Zandian, Vahid. "Factors affecting the rate of devitrification of fused silica powder." Thesis, Staffordshire University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238383.

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Passos, Sheila Pestana. "Adesão e grau de conversão: efeito das cores da cerâmica e do agente de fixação resinoso /." São José dos Campos : [s.n.], 2010. http://hdl.handle.net/11449/105544.

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Resumo: O objetivo deste trabalho foi avaliar a translucidez de diferentes cores da cerâmica, o grau de conversão de diferentes cores do agente de fixação resinoso e a resistência de união entre a cerâmica e a dentina, variando as cores da cerâmica e do agente de fixação e o tempo de fotoativação. A hipótese é que quanto mais escuros o agente de fixação resinoso e a cerâmica, menor translucidez, menor conversão dos monômeros, mais baixa será a resistência adesiva, portanto maior tempo necessário para fotoativação. Três discos da cerâmica Vita VM7 com dimensão de 20 x 2 mm nas cores Base Dentine 0M1, Base Dentine 2M2 e Base Dentine 5M3 e dois discos com 20 x 2,5 mm da mesma cerâmica nas cores Base Dentine 0M1 e Base Dentine 5M3 foram usados para determinar a percentagem de translucidez através do espectrofotômetro MiniScan. Para se obter o grau de conversão (GC), os cp do agente de fixação (Variolink II; A3 Amarelo e transparente; espessura: 100 μm) foram fotoativados sob um bloco cerâmico (espessura: 2 mm; Base Dentine 0M1, Base Dentine 2M2 e Base Dentine 5M3) por 20 ou 40 s. Cp fotoativados sem o bloco cerâmico foram usados como controle. Dezesseis grupos (n=3) foram avaliados. Espectrometria de Micro- ATR/FTIR foi utilizada para avaliar a extensão da polimerização de todos os cp depois de 24 h. A %GC foi calculada e os dados foram analisados através de ANOVA 1-fator e teste de Tukey ( =0,05). Para avaliar adesão, a dentina da superfície oclusal de 80 molares humanos hígidos foi exposta e condicionada com ácido fosfórico 37% e adesivo (Excite DSC). Oitenta blocos (7,2 x 7,2 x 2,5 mm) da mesma cerâmica, nas cores Base Dentine 0M1 e Base Dentine 5M3, foram confeccionados de acordo com as instruções do fabricante. A superfície cerâmica foi tratada com ácido fluorídrico 10% por 60 s e silanizada. Os blocos cerâmicos de cada cor foram cimentados... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The aim of this study was to evaluate the translucency of different ceramic shades, degree of conversion of different resin cement and the bond strength between a feldspathic ceramic and dentin using different resin cement and ceramic shades, and the activation time. The hypothesis is the darker the resin cement and ceramic, lower the translucency; the lower the degree of monomers conversion, lower the bond strength, then the activation time should be higher. Three discs of Vita VM7 ceramic with 20 x 2 mm and shades: Base Dentine 0M1, Base Dentine 2M2 and Base Dentine 5M3, and two discs with 20 x 2.5 mm of the same ceramic and shades: Base Dentine 0M1 and Base Dentine 5M3 were used to determine the translucency percentage of each sp using the MiniScan espectrophotometer. For measure the degree of conversion (DC), the resin cement (Variolink II; A3 Yellow and transparent) specimens (thickness: 100 μm) were photocured under a ceramic block (2mm-thick; Base Dentine 0M1, Base Dentine 2M2 and Base Dentine 5M3) for 20 or 40 s. Specimen photocured without the ceramic block were used as control. Sixteen groups (n=3) were evaluated. Micro-ATR/FTIR spectrometry was used to evaluate the extent of polymerization of all sp after 24 h. The %DC was calculated and the data were analyzed using ANOVA 1-way and Tukey test ( =0,05). For the microtensile bond strength test, the occlusal dentin surface of eighty molars were exposed and etched with 37% phosphoric acid and an adhesive (Excite DSC) was applied. Eighty blocks (7.2 x 7.2 x 2.5 mm) of Base Dentine 0M1 and Base Dentine 5M3 of Vita VM7 ceramic were produced according to the manufacturers. The ceramic surface was etched with 10% hydrofluoric acid for 60 s, followed by the application of a silane agent and a dualcured resin cement (Variolink II; base and catalyst: A3 Yellow; base and catalyst: transparent), according to the manufacturers' ...(Complete abstract click electronic access below)
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3

Passos, Sheila Pestana [UNESP]. "Adesão e grau de conversão: efeito das cores da cerâmica e do agente de fixação resinoso." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105544.

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Made available in DSpace on 2014-06-11T19:35:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-10-18Bitstream added on 2014-06-13T20:45:49Z : No. of bitstreams: 1 passos_sp_dr_sjc.pdf: 3848792 bytes, checksum: 3fb1f1393e2dc87d50d66555ecfbb5ae (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho foi avaliar a translucidez de diferentes cores da cerâmica, o grau de conversão de diferentes cores do agente de fixação resinoso e a resistência de união entre a cerâmica e a dentina, variando as cores da cerâmica e do agente de fixação e o tempo de fotoativação. A hipótese é que quanto mais escuros o agente de fixação resinoso e a cerâmica, menor translucidez, menor conversão dos monômeros, mais baixa será a resistência adesiva, portanto maior tempo necessário para fotoativação. Três discos da cerâmica Vita VM7 com dimensão de 20 x 2 mm nas cores Base Dentine 0M1, Base Dentine 2M2 e Base Dentine 5M3 e dois discos com 20 x 2,5 mm da mesma cerâmica nas cores Base Dentine 0M1 e Base Dentine 5M3 foram usados para determinar a percentagem de translucidez através do espectrofotômetro MiniScan. Para se obter o grau de conversão (GC), os cp do agente de fixação (Variolink II; A3 Amarelo e transparente; espessura: 100 μm) foram fotoativados sob um bloco cerâmico (espessura: 2 mm; Base Dentine 0M1, Base Dentine 2M2 e Base Dentine 5M3) por 20 ou 40 s. Cp fotoativados sem o bloco cerâmico foram usados como controle. Dezesseis grupos (n=3) foram avaliados. Espectrometria de Micro- ATR/FTIR foi utilizada para avaliar a extensão da polimerização de todos os cp depois de 24 h. A %GC foi calculada e os dados foram analisados através de ANOVA 1-fator e teste de Tukey ( =0,05). Para avaliar adesão, a dentina da superfície oclusal de 80 molares humanos hígidos foi exposta e condicionada com ácido fosfórico 37% e adesivo (Excite DSC). Oitenta blocos (7,2 x 7,2 x 2,5 mm) da mesma cerâmica, nas cores Base Dentine 0M1 e Base Dentine 5M3, foram confeccionados de acordo com as instruções do fabricante. A superfície cerâmica foi tratada com ácido fluorídrico 10% por 60 s e silanizada. Os blocos cerâmicos de cada cor foram cimentados...
The aim of this study was to evaluate the translucency of different ceramic shades, degree of conversion of different resin cement and the bond strength between a feldspathic ceramic and dentin using different resin cement and ceramic shades, and the activation time. The hypothesis is the darker the resin cement and ceramic, lower the translucency; the lower the degree of monomers conversion, lower the bond strength, then the activation time should be higher. Three discs of Vita VM7 ceramic with 20 x 2 mm and shades: Base Dentine 0M1, Base Dentine 2M2 and Base Dentine 5M3, and two discs with 20 x 2.5 mm of the same ceramic and shades: Base Dentine 0M1 and Base Dentine 5M3 were used to determine the translucency percentage of each sp using the MiniScan espectrophotometer. For measure the degree of conversion (DC), the resin cement (Variolink II; A3 Yellow and transparent) specimens (thickness: 100 μm) were photocured under a ceramic block (2mm-thick; Base Dentine 0M1, Base Dentine 2M2 and Base Dentine 5M3) for 20 or 40 s. Specimen photocured without the ceramic block were used as control. Sixteen groups (n=3) were evaluated. Micro-ATR/FTIR spectrometry was used to evaluate the extent of polymerization of all sp after 24 h. The %DC was calculated and the data were analyzed using ANOVA 1-way and Tukey test ( =0,05). For the microtensile bond strength test, the occlusal dentin surface of eighty molars were exposed and etched with 37% phosphoric acid and an adhesive (Excite DSC) was applied. Eighty blocks (7.2 x 7.2 x 2.5 mm) of Base Dentine 0M1 and Base Dentine 5M3 of Vita VM7 ceramic were produced according to the manufacturers. The ceramic surface was etched with 10% hydrofluoric acid for 60 s, followed by the application of a silane agent and a dualcured resin cement (Variolink II; base and catalyst: A3 Yellow; base and catalyst: transparent), according to the manufacturers’ ...(Complete abstract click electronic access below)

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4

Tirala, David. "Testování a hodnocení vlastností keramických jader pro technologii vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445169.

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Production of top quality castings for applications in energy, aerospace and medical industries by the addition of ceramic cores to investment casting presents many metallurgical and technological problems. Ceramic cores applied in investment casting are subjects to many requirements in terms of their inertness to the casted alloy and at the same time to their final removal from the casting cavity in such a way that does not damage the casting. Both of these assumptions can be achieved by applying a thin layer of inert oxide ceramic coating to the surface of a ceramic core, made out of a chemically removable – leachable oxide ceramic.

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5

Kinc, Marek. "Numerická simulace výroby keramických jader pro technologii lití na vytavitelný model." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231964.

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The aim of this diploma thesis is validation of numerical simulation of the ceramic core manufacturing in the investment casting proces. The first part submit the theoretical description of the manufacturing of the ceramic cores and a description of the basic principles of numerical simulations. The second part compares the video recording of filling the wax-ceramic mixture to the die-casting mold and simulation of the same process created in a simulation software Cadmould 3D-F.

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6

Rajala, Jonathan Watsell. "ELECTROSPINNING FABRICATION OF CERAMIC FIBERS FOR TRANSPARENT CONDUCTING AND HOLLOW TUBE MEMBRANE APPLICATIONS." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1480909959851349.

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Bořil, Petr. "Výroba a vlastnosti litých keramických jader na bázi etylsilikátu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319254.

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The aim of this diploma thesis is experimental verification of the influence of ceramics composition on the manipulation strength of the cores in the Shaw method. The work deals mainly with influence of the amount of acid in the composition of the binding fluid on the handling strength of the cores and the strength of the cores after annealing. The thesis further examines the possibility of increasing the handling strength of the cores by adding phosphoric acid to the binding fluid.

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Recchia, Johanna. "Le vase et le corps : archéologie du caractère anthropomorphe des poteries du Néolithique en Méditerranée nord-occidentale." Thesis, Montpellier 3, 2018. http://www.theses.fr/2018MON30081/document.

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L’étude du mobilier céramique des peuples de la Préhistoire récente permet aux archéologues de distinguer différents groupes culturels ou cultures matérielles. Ces variétés culturelles reposent sur l’adoption par des groupes humains d’un type particulier de vases qui varie dans le temps et dans l’espace dans les limites d’aires culturelles. Les décors, les éléments de préhension, la morphologie des vases, les techniques de fabrication déterminent ces styles. L’archéologue ou le céramologue perçoit dans l’abondance de caractères ou l’absence de ceux-ci, la marque, le signe, d’un fait culturel. Ces différents critères servent à établir une typologie qui permet d’attribuer une série céramique à un groupe culturel. À travers cette typologie, l’archéologue croit percevoir une intention culturelle. Cependant, un regard porté sur l’ensemble de la céramique du Néolithique affirmé voit, dans la poterie en elle-même, le marqueur d’une nouvelle représentation du fait social et culturel, qui accompagne le nouveau rapport entre l’homme et son environnement à partir du passage à l’économie de production. C’est au travers de la perception de l’identification du vase au corps humain, tel que l’on peut le percevoir dans les sociétés traditionnelles et dans quelques cultures archéologiques, que nous désirons dépasser les limites intrinsèques à l’analyse typologique. Les cultures matérielles sont multiples, séparées, divisées, et leur diversité ne matérialise pas seulement les variétés culturelles. La poterie est avant tout le marqueur d’un nouveau fait culturel qui concerne l’ensemble des cultures néolithiques. Elle est un des vecteurs qui cristallisent l’ancrage du Néolithique et avec lui, une nouvelle perception par l’homme de lui-même, de sa société, de l’univers réel qu’il habite, mais aussi de l’univers spirituel, mythologique, imaginé, symbolisé qui l’habitent. En choisissant comme point de départ les différentes démarches analytiques sur la céramique du Languedoc-Roussillon depuis le Néolithique ancien au Néolithique final, nous voulons considérer la poterie, au-delà de son intérêt matériel, dans son intérêt symbolique et culturel
This thesis proposes to study the question of the relations between the body and the Neolithic pottery through the case of so-called anthropomorphous vases in the north-western Mediterranean.The first part presents the problematic of this thesis and presents the chronological and geographical framework. We make a brief review of the knowledge of the presence of this type of artefacts and commonly proposed interpretations, and we expose the methods by which we intend to analyze anthropomorphic vases.The second part presents the corpus of vases collected in the catalog (volume 2) by chrono-cultural area. It proposes a typological classification of these pottery and it discusses more particularly the modalities of their emergence in the North-Western Mediterranean, their diffusion or their evolution.The last part questions the choice of pottery as a medium of Neolithic body representation. The creation of a repository of data from ethnology, ethnoarchaeology or narratives allows us to situate our object of study in the field of metaphor and to approach it as a sign. We draw inspiration from theories from semiology and more generally from cultural anthropology in order to get out of the usual accepted archaeological interpretations.The results lead us to propose a definition of anthropomorphic vases and to discuss the phenomenon of the anthropomorphization of vases in the Neolithic context and the effects of agro-pastoral lifestyles on the production of the body's imaginary

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Viat, Ariane. "Troisième corps à l'interface céramique métal sous chargement de fretting usure à hautes températures." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC054.

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Dans un turboréacteur civil, le contact aube/disque de la turbine basse pression est soumis à un cyclage thermomécanique dû aux dilatations et déplacements différentiels des pièces pendant les phases de vol. Ce cyclage implique des micro-mouvements alternés relatifs, c’est-à-dire du fretting, à l’interface aube/disque. Le fretting à l’étude ici concerne un contact céramique-métal, en vue de comprendre le comportement tribologique des futures aubes revêtues de céramique en remplacement des pièces métalliques traditionnelles. Dans un premier temps, différents revêtements sont comparés vis-à-vis de leur tenue à l’usure par fretting à la température de fonctionnement des pièces (700°C). L’alliage métallique du contrecorps est celui du clinquant protégeant le disque, à savoir l’alliage base cobalt HS25. Pour le contact HS25/céramique le plus prometteur, le taux d’usure très bas ainsi que le faible frottement observés sont associés à la formation d’une glaze layer. La glaze layer est un troisième corps formé à partir des débris d’usure qui apparaît dans des contacts frottant à haute température. Traditionnellement observée pour des contacts métal/métal, sa formation pour un contact métal/céramique est nouvelle. La glaze layer est alors étudiée en détail. D’un point de vue tribologique, on établit sa cinétique et ses conditions de formation en température et en fonction des paramètres tribologiques, afin de garantir une usure faible en conditions de vol. D’un point de vue morphologique, la glaze layer est caractérisée comme étant un matériau nanostructuré amorphe et cristallin, formé à partir de débris à la fois métalliques et oxydés. Enfin, la glaze layer nanostructurée est associée à un comportement mécanique ductile dans son domaine de stabilité, alors que les débris sont fragiles en conditions d’usure forte. La corrélation des angles d’étude de la glaze layer permet alors de connaître les modalités de sa formation, en vue d’anticiper la protection d’un contact vis-à-vis de l’usure grâce à la création d’une glaze layer
In a civil turbojet motor, the blade/disk contact in the low pressure turbine undergoes thermomechanical cycling due to relative displacements between parts during the different flight phases. This cycling results in reciprocating micro-movements named “fretting” at the blade/disk interface. This study focuses on a ceramic versus metallic contact under fretting, aimed at describing the tribological behavior of developing ceramic-coated blades to replace phased-out metallic parts. Firstly, different ceramic coatings are compared regarding their wear resistance under fretting at in-flight temperature (700°C). The counterbody is the HS25 (cobalt-based alloy) protecting foil of the disk. The most favorable ceramic/metallic tribocouple evidences a very low wear rate as well as low friction that match the formation of a glaze layer. The glaze layer is a third body formed from wear debris in high temperature rubbed contacts. Such tribofilm has been commonly observed in metallic/metallic interfaces but its occurrence in a ceramic/metallic contact is new. Then the glaze layer is precisely characterized. Tribologically speaking, its kinetics and formation conditions are determined over temperature and tribological parameters, in order to ensure low wear under flight conditions. Morphologically, the glaze layer is a nanostructured amorphous and crystalline sintered from both metallic and oxidized worn debris. Finally, the nanostructured glaze layer is mechanically described as a ductile material in its stability domain, whereas debris from severe wear are brittle. The correlation of morphological, physico-chemical and mechanical studies enlighten the glaze layer formation criteria, with the aim of predicting glaze layer occurrence, hence wear protection for a given contact

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PORTELLA, KLEBER F. "Projeto, montagem e caracterizacao de um sensor de fluor com eletrolito solido ceramico de PbFsub2." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10645.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Books on the topic "Ceramic cores"

1

E, Carden A., Thomas Susan P, and American Foundrymen's Society, eds. Electrohydraulic removal of ceramic shell and cores from investment castings: Research report. [Des Plaines, Ill.]: American Foundrymen's Society, 1994.

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The complete guide to mid-range glazes: Glazing & firing at cones 4-7. Union Square & Co., 2014.

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Workshop, Bloomsbury, ed. Christmas comes to Bloomsbury: An exhibition of paintings and drawings and ceramics, woodcuts, photographs and others. London: The Bloomsbury Workshop, 1994.

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Book chapters on the topic "Ceramic cores"

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Arin, M., S. Sevik, and A. B. Kayihan. "Preparation and Characterization of Fused Silica Based Ceramic Cores Used in Superalloy Casting." In Ceramic Transactions Series, 131–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470522189.ch12.

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Yang, Zhigang, Zhijia Zhao, Qian Li, Jianbo Yu, Zhongming Ren, Zhi Wang, and Shuxia Ren. "Preparation of Al2O3 Ceramic Cores by Dry-Pressing Assisted of Precursor-Derived Ceramic Technology." In Springer Proceedings in Physics, 1–8. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5947-7_1.

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Yu, Jianbo, Zhigang Yang, Zongcheng Song, Zhongming Ren, and Kang Deng. "Influence of Compaction Pressure on the Properties of Silica Ceramic Cores." In Advanced Functional Materials, 515–21. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_56.

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Moritz, Tassilo, and Hans Jürgen Richter. "Freeze Casting of Ceramic Components Using Ice Cores and Ice Moulds." In Advances in Science and Technology, 391–96. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.391.

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Park, Il Seok, Se Young Choi, Myung Hyun Lee, Dae Joon Kim, and Jung Suk Han. "All-Ceramic Fixed Partial Denture Cores Prepared Using Water-Based Alumina Tapes." In Bioceramics 17, 929–32. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-961-x.929.

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Song, Qiang, Hong Fei Sun, and Can Ming Wang. "Study of New Metal/Ceramic Cored Wires." In Key Engineering Materials, 1769–72. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1769.

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Roberson, C., and P. J. Hazell. "Resistance of Silicon Carbide to Penetration by a Tungsten Carbide Cored Projectile." In Ceramic Transactions Series, 165–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406793.ch14.

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Roberson, C., and P. J. Hazell. "Resistance of Different Ceramic Materials to Penetration by a Tungsten Carbide Cored Projectile." In Ceramic Transactions Series, 153–63. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406793.ch13.

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Hartley, Craig S., Paul R. Dawson, Donald E. Boyce, Surya R. Kalidindi, Marko Knezevic, Carlos Tomé, Ricardo Lebensohn, S. Lee Semiatin, Todd J. Turner, and Ayman A. Salem. "A Comparison of Deformation Textures and Mechanical Properties Predicted by Different Crystal Plasticity Codes." In Ceramic Transactions Series, 701–12. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470444191.ch79.

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Jenkins, Michael G. "Next Generation Nuclear Power and the Need for Test Standards, Design Codes, and Data Bases for Ceramic Matrix Composites." In Ceramic Transactions Series, 251–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144091.ch24.

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Conference papers on the topic "Ceramic cores"

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Dou, Yangliu, Fengjun Yan, and Kun Bu. "Reversing Design Methodology of Ceramic Core for Hollow Turbine Blade Based on Measured Data." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38284.

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The precision of complex ceramic core is one of the essential factors for hollow turbine blade manufacturing, which has a significant impact on the development of the modern aircraft engine. In terms of the low precision of ceramic core formation, this paper proposes an approach through measuring the data from a group of ceramic cores, to study the computational methods for displacement field, deformational feature decoupling, and structural shrinkage ratio. Based on modeling and analysis of decoupled deformational features and the uneven structural shrinkage ratio, this paper proposes an inverse design method and optimizes the design of the die profile for ceramic core. The applicability of this method is validated using numerical simulation data and experimental results.

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Kamruzzaman, Asm, Hossein Kazemi, Timothy J. Kneafsey, and Matthew T. Reagan. "Enhanced Oil Recovery Experiments in Wolfcamp Outcrop Cores and Synthetic Cores to Assess Contribution of Pore-Scale Processes." In SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209455-ms.

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Abstract This paper assesses the pore- and field-scale enhanced oil recovery (EOR) mechanisms by gas injection for low permeability shale reservoirs. We performed compression-decompression laboratory experiments in ultratight outcrop cores of the Permian Basin as well as in ceramic cores using n-dodecane for oil. The EOR assessment strategy involved determining the quantity of oil produced after injection of helium (He), nitrogen (N2), methane (CH4), and methane/carbon dioxide (CH4/CO2) gas mixtures into unfractured and fractured cores followed by depressurization. Using the oil recovery volumes from cores with different number of fractures, we quantified the effect of fractures on oil recovery—both for Wolfcamp outcrop cores and several ceramic cores. We observed that the amount of oil recovered was significantly affected by the pore-network complexity and pore-size distribution. We conducted laboratory EOR tests at pore pressure of 1500 psia and temperature of 160°F using a unique coreflooding apparatus capable of measuring small volumes of the effluent oil less than 1 cm3. The laboratory procedure consisted of (1) injecting pure n-dodecane (n-C12H26) into a vessel containing a core which had been moistened hygroscopically and vacuumed, and raising and maintaining pressure at 1500 psia for several days or weeks to saturate the core with n-dodecane; (2) dropping the vessel pressure and temperature to laboratory ambient conditions to determine how much oil had entered the core; (3) injecting gas into the n-dodecane saturated core at 1500 psia for several days or weeks; (4) shutting in the core flooding system for several days or weeks to allow gas in the fractures to interact with the matrix oil; (5) finally, producing the EOR oil by depressurization to room pressure and temperature. Thus, the gas injection EOR is a ‘huff-and-puff’ process. The primary expansion-drive oil production with no dissolved gas from fractured Wolfcamp cores was 5% of the initial oil in place (IOIP) and 3.6% of IOIP in stacked synthetic cores. After injecting CH4/CO2 gas mixtures, the EOR oil recovery by expansion-drive in Wolfcamp core was 12% of IOIP and 8.2% of IOIP in stacked synthetic cores. It is to be noted that the volume of the produced oil from Wolfcamp cores was 0.27 cm3 while it was 6.98 cm3 in stacked synthetic cores. Thus, while synthetic cores do not necessarily represent shale reservoir cores under expansion drive and gas-injection EOR, these experiments provide a means to quantify the oil recovery mechanism of expansion-drive in shale reservoirs. The gas injection EOR oil recovery in Wolfcamp cores with no fractures yielded 7.1% of IOIP compared to the case of one fracture and two fractures which produced 11.9% and 17.6% of OIP, respectively. Furthermore, in the no-fracture, one-fracture, and two-fracture cores, more EOR oil was produced by increasing the CO2fraction in the injection gas mixture. This research provides a basis for interpreting core flooding oil recovery results under expansion drive and gas injection EOR—both in presence and absence of interconnected micro- and macro-fractures in the flow path. Finally, the CO2 injection results quantify the CCUS efficacy in regard to the amount of sequestered CO2 from pore trapping in the early reservoir life. For the long-term CO2 trapping, one needs to include the chemical interaction of CO2 with the formation brine and rock matrix.

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Beck, Douglas Stephen. "Optimization of Regenerated Gas Turbines." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-231.

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An algorithm for the optimization of regenerated gas turbines is given. For sets of inputs that are typical for automotive applications, the optimum cycle pressure ratio and a set of optimized regenerator parameters that maximize thermal efficiency are given. A second algorithm, an algorithm for sizing regenerators based on outputs of the optimization algorithm, is given. With this sizing algorithm, unique regenerator designs can be determined for many applications based on the presented optimization data. Results of example sizings are given. The data indicate that one core (instead of two cores) should be used to maximize thermal efficiency. The data also indicate that thermal efficiencies of over 50% should be achievable for automotive applications if ceramic turbines are used.

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Poette, Christian, Vale´rie Brun-Magaud, Franck Morin, Jean-Franc¸ois Pignatel, Richard Stainsby, and Konstantin Mikityuk. "Allegro: The European Gas Fast Reactor Demonstrator Project." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75326.

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In the Gas Fast Reactor development plan, ALLEGRO is the first necessary step towards the electricity generating prototype GFR. The ALLEGRO start of operation is planned by 2020. This needs to define all design options in 2010 and to start detailed design studies in 2013. ALLEGRO is a low power Gas Cooled Fast Reactor studied in the European framework. It is a loop type, non electricity generating reactor. Its power is about 80 MW. Several objectives are assigned to ALLEGRO. At first, it will demonstrate the viability of the GFR reactor system, no reactor of this type having been built in the past. Most of the GFR architecture, materials and components features are considered at reduced scale in ALLEGRO, excluding the energy conversion system. ALLEGRO will rely on the same safety options as the reactor system. In addition, the ALLEGRO core will allow the progressive qualification of the GFR ceramic fuel, with the possibility to load some ceramic carbide or nitride sub-assemblies in a first MOX core, with SiC/SiCf cladding and wrappers. When such unit test will be considered convincing enough, the diagrid and circuits are designed to accept full high temperature ceramic cores. The core neutrons can also be used to irradiate structural materials with fast neutron spectrum and in a large temperature range. The core can also include innovative irradiation fuel devices (samples or full bundles) for other reactor systems. Finally, branches on the main intermediate heat exchanger will allow the testing and validation of high temperature components and processes. The pre-conceptual design of ALLEGRO is shared between European partners through the GCFR 6th R&D Framework Program. After recalling the role of the European partners in the different design and safety tasks, the paper will give an overview of the current design with recent progresses in various areas like: • Core design and neutron performances, • The design of experimental advanced ceramic GFR fuel sub-assemblies included in several locations of the MOX core, • Fuel handling principles and solutions, • System design and global reactor architecture which is largely influenced by the Decay Heat Removal strategy (DHR) for depressurized accidents.

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Terrani, Kurt A., Lance L. Snead, and Jess C. Gehin. "FCM Fuel Development for SMR Applications." In ASME 2011 Small Modular Reactors Symposium. ASMEDC, 2011. http://dx.doi.org/10.1115/smr2011-6608.

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Fully ceramic microencapsulated (FCM) fuels are identified as suitable fuel forms for development and deployment of SMR technologies. High thermal conductivity of the composite fuel coupled with its exceptional radiation and environmental stability enable monolithic compact cores for SMR applications. Meanwhile the built-in redundancy of multiple layers for fission-product retention alleviates the need for structurally demanding pressure vessels and containment buildings. All of the above will enable the reactor designer to achieve a compact and passively safe SMR through utilization of a flexible fuel technology that is currently under active development.

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Song, Xiao-Fei, Jianhui Peng, Ling Yin, and Bin Lin. "In Vitro Dental Cutting of Feldspar and Leucite Glass Ceramics Using an Electric Handpiece." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7290.

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Glass ceramics are important restorative materials in dentistry. They are used as veneer-core bilayer all-ceramic or metal-fused ceramic restorations or monolithic inlays/onlays/crowns to replace missing or damaged tooth structures for aesthetic and functional purposes. However, glass ceramic materials, such as feldspar and leucite glass ceramics, which are subject to this investigation, are brittle and easily induced microfractures in abrasive cutting using dental handpieces and coarse burs. In this paper, we investigated the dental abrasive cutting characteristics of feldspar and leucite glass ceramics using a high-speed electric handpiece and coarse diamond burs. Cutting forces, specific removal energy, surface roughness and morphology were investigated as functions of specific material removal rate and maximum undeformed chip thickness. The results indicate that increasing the specific material removal rate or the maximum undeformed chip thickness resulted in increases in both tangential and normal forces, but a decrease in specific removal energy for both ceramics. Tangential, normal forces and specific removal energy were significantly larger in up cutting than those in down cutting. Surface roughness for the two ceramics was not affected by the specific removal rate or the maximum undeformed chip thickness. Both microfrature and ductile microcutting morphology were observed in the machined surfaces for both ceramics. There existed a brittle to ductile transition trend when decreasing the specific material removal rate or the maximum undeformed chip thickness for the two ceramics. In comparison with feldspar glass ceramic, leucite glass ceramic generated better surfaces due to its more ductile deformation occurring in dental cutting.

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Aktaş, Latif Tibet, and Mehmet Çevik. "Diameter and Pattern Effects of Al2O3 Balls on Ballistic Strength of Metal–Ceramic Composites." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.034.

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In composite materials made from metals and ceramics, a metallic substrate material is reinforced with ceramic hardened particles. This combination makes it possible to combine the low weightiness of the metal with the resistance of ceramics. Used metals in those types of composites have greater density than the ceramics, so relatively, metals are heavier than ceramics, but in metal-ceramic composite applications, the metal parts are used in small quantities as in thin slices. These types of composites can combine attractive properties of both a ceramic, such as high temperature resistance and hardness, and those of a metal, such as the ability to undergo plastic deformation. Metal-ceramic armors are used in the fields where the weight factor is not crucial yet important for mobilization. Metal-ceramic composites show their unique values in armor technologies especially in vehicle protection applications. Ceramic balls offer advantages such as being lightweight, lower friction resistance, high temperature resistance, higher rigidity, higher hardness, and higher corrosion resistance than metallic composite core, but these properties belong to the material nature. In ballistic applications like high velocity impact situations, spherical shape, theoretically must influence bullet trajectory. Because of the curved surface of a sphere, chances are a projectile hits any spherical surface obliquely. That means the projectile loses some of its kinetic energy by transferring it into the sphere and changing course into another trajectory axis. Shao et al. showed this trajectory deflection effect vividly [1].

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8

Aung, Tint Htoo, Romain Djenani, Aaron Byrd, Matt Beavers, Cedric Manzoleloua, Sarah Green, and Balkrishna Gadiyar. "Novel Approach in Deploying Filter Cake Breaker Post Open Hole Gravel Pack with Non-Aqueous Gravel Pack Carrier Fluid in Reservoir with Reactive Shales." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208827-ms.

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Abstract Non-aqueous gravel pack carrier fluids (GPCF) have been introduced into the industry to eliminate the risks associated with the water-based carrier fluids in the presence of reactive shale interbeds in the reservoir. However, non-aqueous GPCF pose a significant barrier to the effective deployment of post-gravel pack filter cake breaker (FCB) application because all FCB systems are water-based. Therefore, a novel approach was developed for FCB application in non-aqueous GPCF environment to improve the efficiency of the FCB and the overall well performance. The non-aqueous GPCF was redesigned from ground up to promote the better diffusion of the FCB. This was accomplished by introducing a reversible emulsifier package into the non-aqueous GPCF design which allows the gravel to change wettability from an oil-wet state to a water-wet state when a low pH solution i.e., breaker is spotted inside the sand screens after the open hoel gravel pack (OHGP). To complement this, the FCB design was deconstructed, and the in-situ breaker component was blended with the gravel. The concept was to incorporate the in-situ breaker component into the gravel pore space which would promote better diffusion of FCB through the reversible non-aqueous GPCP. The in-situ breaker component is inert to the carrier fluid until it is activated by the temperature and water posing no threat to the stability of the carrier fluid while pumping. The innovative approach was tested in the laboratory setting using ceramic disks and return to flow method to prove the concept before conducting an elaborate return permeability testing with the reservoir core plugs for the final validation. Return to flow method indicated that the novel approach could improve the results by at least 10% compared to the baseline test with no breaker application. In the return permeability tests with reservoir core plugs, the novel approach resulted in 76% of the initial permeability whereas the baseline test was only 50%. Both the tests with ceramic disks and full-sequence formation damage tests with actual reservoir cores highlighted the benefits of the novel approach for gravel packing with non-aqueous GPCF and post-gravel pack FCB scenario. Non-aqueous GPCFs are relatively new to the industry and no record of the filter cake breaker application in such environment exists. This novel approach makes the filter cake breaker application possible in non-aqueous environment and pushes the existing boundaries of filter cake breaker chemistries.

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Ieronymidis, Ioannis, David R. H. Gillespie, Peter T. Ireland, and Robert Kingston. "Detailed Heat Transfer Measurements in a Model of an Integrally Cast Cooling Passage." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91231.

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Detailed measurements of the heat transfer coefficient distributions on the internal surfaces of a novel gas turbine blade cooling configuration were carried out using a transient liquid crystal technique. The cooling geometry, in which a series of racetrack passages are connected to a central plenum, provides high heat transfer coefficients in regions of the blade in good thermal contact with the outer blade surface. The Reynolds number changes along its length because of the ejection of fluid through a series of 19 transfer holes in a staggered arrangement, which are used to connect ceramic cores during the casting process. Heat transfer coefficient distributions on this holes surface are particularly important in the prediction of blade life, as are heat transfer coefficients within the hole. Results at passage inlet Reynolds numbers of 21667, 45596 and 69959 are presented along with in-hole htc distributions at Rehole = 5930, 12479, 19147 and suction ratios of 0.98, 1.31, 2.08, 18.67. All values are engine representative. The results were compared to predictions made using the commercial CFD package Fluent. Characteristic regions of high heat transfer downstream of the transfer holes were observed with enhancement of up to 92% over the Dittus-Boelter level. Within the transfer holes, the average htc level was strongly affected by the crossflow at the hole entrance. Htc levels were low in these short (l/d = 1.5) holes fed from regions of developed boundary layer.

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10

Yan, Xuesong, Xunchao Zhang, Yaling Zhang, Lei Yang, and Wenshan Duan. "Preliminary Neutron Simulation of Ceramic Fast Reactor." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81474.

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In this paper, preliminary neutron physical properties of ceramic fast reactor (CFR) are simulated and analyzed. The CFR core consists of ceramic materials, including nuclear fuels, coolants, structural materials, reflective and absorption materials. These ceramics improve inherent safety levels substantially, increase breeding performance, and enhance the power-generation efficiency. The CFR has the potential to operate and breed more than 30 years. The performance of the CFR was simulated focusing on neutron-related effects. The parameters discussed contain fast neutron energy spectrum, the ideal effective multiplication-factor, nuclides mass changes, breeding performance, operation mode, etc. Furthermore, the strengths of the proposed reactor system are discussed. In the future nuclear energy system, CFR may be one of the existing alternative novel reactor type.

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Reports on the topic "Ceramic cores"

1

BATTELLE COLUMBUS DIV OH. Core Operations of the Metals and Ceramics Information Center (A DoD information Analysis Center). Fort Belvoir, VA: Defense Technical Information Center, August 1990. http://dx.doi.org/10.21236/ada229682.

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