Academic literature on the topic 'NbC composite'

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Journal articles on the topic "NbC composite"

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Akhtar, Farid. "High Volume Fraction Carbide Reinforced Copper Matrix Composites for Sliding Contact Applications." Materials Science Forum 561-565 (October 2007): 627–30. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.627.

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This study deals with the processing, microstructure and properties of the carbide reinforced copper matrix composites. Powder technology was used to successfully fabricate the composites. NbC particulates were used as reinforcements for copper matrix. The microstructure of the composite was characterized by scanning electron microscopy. The microstructural study revealed that the NbC particles were distributed uniformly in the matrix phase. No interface debonding and micro- cracks were observed in the composite. NbC particles were found in round shape in copper matrix composite. The composite hardness of 78 HRA was found with 60vol% NbC content. Electrical conductivity as high as 7%IACS was achieved. The wear performance and conductivity value predicts that NbC reinforced copper matrix composites can be used as sliding contact applications.
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Long, B. D., R. Othman, Hussain Zuhailawati, and M. Umemoto. "Comparison of Two Powder Processing Techniques on the Properties of Cu-NbC Composites." Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/160580.

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Anin situCu-NbC composite was successfully synthesized from Cu, Nb, and C powders using ball milling and high pressure torsion (HPT) techniques. The novelty of the new approach, HPT, is the combination of high compaction pressure and large shear strain to simultaneously refine, synthesize, and consolidate composite powders at room temperature. The HPTed Cu-NbC composite was formed within a short duration of 20 min without Fe contamination from the HPT’s die. High porosity of 3–9%, Fe and niobium oxidations, from grinding media and ethanol during ball milling led to low electrical conductivity of the milled Cu-NbC composite. The electrical conductivity of the HPTed Cu-NbC composite showed a value 50% higher than that of milled Cu-NbC composite of the same composition.
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Muralimanokar, M., Vignesh R. Vaira, R. Padmanaban, and Priyadharshini G. Suganya. "Characterization of AZ31-NbC surface composite fabricated by friction stir processing." Koroze a ochrana materialu 64, no. 1 (March 1, 2020): 29–37. http://dx.doi.org/10.2478/kom-2020-0005.

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AbstractAZ31D magnesium alloy is widely used in automotive, aircraft, and aerospace applications because of its high strength to weight ratio. However, the softness of the alloy results in higher wear rate and the high activity results in higher corrosion rate. With an aim of reducing the wear rate and corrosion rate of AZ31 alloy, surface composite of AZ31 alloy is fabricated by reinforcing niobium carbide (NbC) by friction stir processing. The microstructure and dispersion of the reinforcements in AZ31-NbC surface composite is analysed by optical microscopy. In addition, the microhardness and tribological characteristics of the developed AZ31-NbC surface composite are investigated. The results demonstrated an increase in microhardness (23.2 %) and the decrease in wear rate (15.6 % for a normal load of 2 kg) in the developed AZ31-NbC surface composite with respect to the base material. The immersion corrosion test was performed to analyse the corrosion rate of the developed AZ31-NbC surface composite in simulated sea water environment (3.5 wt % NaCl solution). The results indicate that the corrosion rate of the developed AZ31-NbC surface composite is higher than that of base material. A comprehensive analysis on the wear and corrosion mechanism of the developed AZ31-NbC surface composite is presented.
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Scheffler, M., O. Dernovsek, D. Schwarze, A. H. A. Bressiani, J. C. Bressiani, W. Acchar, and P. Greil. "Polymer/filler derived NbC composite ceramics." Journal of Materials Science 38, no. 24 (December 2003): 4925–31. http://dx.doi.org/10.1023/b:jmsc.0000004415.23316.b0.

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Shi, Baoming, Shiming Huang, Ping Zhu, Changen Xu, and Tengfei Zhang. "Microstructure and Wear Behavior of In-Situ NbC Reinforced Composite Coatings." Materials 13, no. 16 (August 5, 2020): 3459. http://dx.doi.org/10.3390/ma13163459.

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In the present study, plasma spray welding was used to prepare an in-situ niobium carbide (NbC) reinforced Ni-based composite coating on the low carbon steel, and the phase composition and the microstructure of the composite coatings were studied. The wear resistance and the wear mechanism of the composite coatings were also researched by the wear tests. The results showed that the main phases of the composite coating were NbC, γ-Ni, Cr23C6, Ni3Si, CrB, Cr5B3, Cr7C3 and FeNi3. A number of fine in-situ NbC particles and numerous chromium carbide particles were distributed in the γ-Ni matrix. The increase in the mass fraction of Nb and NiCr-Cr3C2 could lead to the increase in NbC particles in the composite coatings. Due to the high hardness of NbC and chromium carbides, the micro-hardness and the wear resistance of the composite coatings were advanced. The composite coating with the powder mixtures of 20% (Nb + NiCr-Cr3C2) and 80% NiCrBSi had the highest micro-hardness and the best wear resistance in this study. The average micro-hardness reached the maximum value 1025HV0.5. The volume loss was 39.2 mm3, which was merely 37% of that of the NiCrBSi coating and 6% of that of the substrate under the identical conditions.
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Öveçoğlu, M. Lütfi, Emre Tekoğlu, Sıddıka Mertdinç, and Duygu Ağaoğulları. "Characterization Investigations of a Al-5 wt.% Si/2 wt% (NbB2, NbC) Hybrid Composite Fabricated via Mechanically Alloying and Sequentially Milling (Mechanical Alloying + Cryomilling)." Key Engineering Materials 759 (January 2018): 35–39. http://dx.doi.org/10.4028/www.scientific.net/kem.759.35.

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In this study, microstructural and mechanical properties of a Al-5 wt.% Si/2 wt% (NbB2, NbC) composite synthesized by sequentially milling (mechanical alloying (MA) and/or cryogenic milling (CM)) were investigated. Nb2O5, B2O3 and C powder blends were milled using high energy milling for 5 h and annealed at 1400 oC for 12 h to produce NbB2-NbC hybrid powders. The NbB2-NbC hybrid powders were mixed with the matrix Al-5 wt.% Si powders to constitute the Al-5 wt.% Si/2 wt.% (NbB2-NbC) powders blends which were mechanically alloyed (MA'd) for 4 h using SpexTM Mixer/Mill, cryo-milled for 10 min in a SpexTM 6870 Freezer/Mill and finally MA’d for 1h in SpexTM Mixer/Mill again. As-blended, MA’d and cryomilled powders were compacted in a hydraulic press with a uniaxial pressure of 450 MPa. Compacted samples were sintered at 570°C for 2 h under Ar gas atmosphere. Microstructural characterizations of the as-blended/MA'd powders and the sintered composites were performed using X-ray diffractometry (XRD) and scanning electron microscopy (SEM) techniques. Density and microhardness measurements and sliding wear tests were performed on the sintered composite samples. Sequentially milled and sintered Al-5 wt.% Si-2 wt.% (NbB2-NbC) samples had the highest mean microhardness value (2.29 ± 24.98 GPa) and the lowest wear volume loss (0.038 mm3).
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Voitovich, Elena Valerievna, Alla Vasilievna Cherevatova, Igor Vladimirovich Zhernovsky, Hans Bertram Fischer, Valeria Valerievna Strokova, Natalya Valentinovna Makarova, and Elena Nikolaevna Chikileva. "Influence of Nanosized Silica Component on Physical and Mechanical Properties of a Composite Gypsum Binder." Applied Mechanics and Materials 584-586 (July 2014): 1756–60. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1756.

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The work presents the results of development of the composite gypsum binder (GB) with nanostructured binder on the basis of silica component (NBC). Introduction of NBC changes the kinetics of hardening, as well as improves physical and mechanical properties of gypsum system. Analysis of the microstructure of the GB has demonstrated in the presence of the NB the size and morphology of crystals are changed, promoting the formation of fine-crystalline structure and increase the contact area between new formations, compared to NBC – free gypsum system. Experimental studies have shown that the mechanical properties of the composite gypsum application of NBC increased, reduced water absorption, density increases, and increases the setting time.
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Rasib, Siti Zalifah Md, and Zuhailawati Hussain. "Mechanical Alloying of Fe-Nb-N with Different Ball to Powder Weight Ratio for the Formation of Fe-NbC Composite." Advanced Materials Research 620 (December 2012): 94–98. http://dx.doi.org/10.4028/www.scientific.net/amr.620.94.

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Milling process through mechanical alloying method was performed on a powder mixture of Fe-80.11 wt%, Nb-17.62 wt% and C-2.26 wt% to produce Fe-NbC composite by in situ reaction. Ball to powder weight ratio parameter was selected since formation of phase and microstructure characteristics of this composite were expected to depend on ball collision event during milling. The as-milled and sintered Fe-NbC was characterized by X-ray diffraction (XRD) and Scanning Electron Microscopic (SEM). We found that formation of Fe-NbC by in situ required mechanical alloying of the mixture using 10:1 of ball to powder weight ratio to achieve small crystallite size and more homogeneous of NbC phase.
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Sun, Yao Ning, Ding Fan, Yu Feng Zheng, Min Zheng, and Jian Bin Zhang. "In Situ Formation of NbC Reinforced Ni3Si Intermetallic Compounds by Laser Cladding." Key Engineering Materials 368-372 (February 2008): 1351–53. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1351.

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Laser cladding technique was used to form Ni3Si intermetallic composite coating reinforced by in-situ formation NbC particles on Ni-based superalloy substrate. The process parameters were optimized to obtain cladding. The effect of Nb-C addition to the microstructure of the coating was investigated. The morphology of reinforcement particles was discussed. The experimental results showed that an excellent bonding between the coating and the substrate was ensured by a strong metallurgical interface. The clad coating was very good and free from cracks and pores. The microstructure of the coating was mainly composed of Ni(Si), Ni3(Si, Nb) and NbC. The NbC particles were formed by in-situ reaction between Nb and C during laser cladding process. NbC particles were homogeneously distributed in the composite material. Moreover, the maximum size of NbC particles was more than 4 μm.
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Dong, Gang, Biao Yan, Qi Lin Deng, Ting Yu, Yu Xin Wang, and Yin Hui Yang. "Fabrication of Ni-Based Composite Coating Reinforced with NbC Particles by Laser Cladding." Materials Science Forum 686 (June 2011): 553–60. http://dx.doi.org/10.4028/www.scientific.net/msf.686.553.

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The in situ synthesized NbC particles reinforced Ni-based alloy composite coating has been successfully prepared on 1045 steel substrate by laser cladding a precursor mixture of Ni-based alloy, graphite and niobium powders. The microstructure, phase composition and wear property of the composite coating are investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and dry sliding wear test. The experiment results show that the coating is uniform, continuous and free of pores and cracks with excellent bonding between the coating and the substrate. The microstructure of the coating is mainly composed of γ-Ni dendrite, a large amount of interdendritic eutectics of M23(CB)6, N3B with γ-Ni, M23(CB)6type carbides and dispersed NbC particles. The growth mechanism of the NbC particles with cores is nucleation-growth and the un-melted niobium may act as the nucleation core for NbC, Compared to the pure Ni-based alloy coating, the hardness of the composite coating is increased about 36 %, giving a high average hardness of approximate HV0.2750. Moreover, the wear volume and wear rate of the composite coating are decreased about 50 % and 42 %, respectively. This is attributed to the presence of in situ synthesized NbC particles and their well distribution in the coating.
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Dissertations / Theses on the topic "NbC composite"

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SANTOS, THAIS da S. "Micro-nanocompósitos de Al2O3/ NbC/ WC e Al2O3/ NbC/ TaC." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23599.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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FERREIRA, VANDERLEI. "Processamento, caracterizacao mecanica e tribologica do composito Alsub(2)Osub(3)-Nbc." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10894.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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TONELLO, KAROLINA P. dos S. "Compositos a base de Alsub(2)Osub(3) com adicoes de NbC e de MgO." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11780.

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PANELLI, RENATO. "Processamento do aco AISI M2 com adicao de 10 porcento vol. NbC utilizando a tecnica de mechanical alloying." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10748.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:96/08958-1
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Salem, Raphael Euclides Prestes. "Desenvolvimento de ZrO2/Al2O3 e ZrO2/Al2O3-NbC usando sinterização convencional e não convencional." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-26022018-094441/.

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Os compósitos cerâmicos de alto desempenho têm sido objeto de frequentes estudos nas últimas décadas, visando à melhora das propriedades mecânicas e ao aumento da sua gama de aplicações em produtos tecnológicos. Este trabalho consistiu em estudar a preparação, a sinterização convencional e não convencional e as propriedades mecânicas e tribológicas resultantes de dois sistemas compósitos: t-ZrO2/Al2O3 e t-ZrO2/Al2O3-NbC. No sistema t-ZrO2/Al2O3 foram estudadas as composições de 0, 5 e 15% em volume de Al2O3 usando pós comerciais. No sistema t-ZrO2/Al2O3-NbC, foi usado um pó nanocristalino de Al2O3-NbC, obtido por moagem reativa de alta energia e adicionado na proporção de 5% em volume à matriz de t-ZrO2. Os pós foram prensados uniaxial e isostaticamente e sinterizados em forno convencional e pelas técnicas de flash sintering (FS) (t-ZrO2/Al2O3) e spark plasma sintering (SPS) (t-ZrO2/Al2O3-NbC). Os compósitos t-ZrO2/Al2O3 sinterizados convencionalmente e t-ZrO2/Al2O3-NbC sinterizados convencionalmente e por SPS foram caracterizados por medidas de densidade aparente, dilatometria, microscopia eletrônica de varredura (MEV), e medidas de propriedades mecânicas: dureza, módulo de Young e tenacidade à fratura. Os compósitos t-ZrO2/Al2O3 sinterizados por FS foram caracterizados por medidas de densidade aparente, dilatometria in situ e MEV. Os nanocompósitos de t-ZrO2/Al2O3-NbC foram também caracterizados quanto à resistência ao desgaste pelo método esfera-no-disco, utilizando esferas de Al2O3 e WC-6%Co como contramateriais. Os resultados mostraram que a moagem reativa de alta energia foi completa e efetiva na obtenção de pós nanométricos de Al2O3-NbC, com tamanhos de cristalito de 9,1 nm para Al2O3 e 9,7 nm para o NbC. A desaglomeração posterior à moagem de alta energia foi eficaz na redução do tamanho de aglomerados. Os compósitos t-ZrO2/Al2O3 e t-ZrO2/Al2O3-NbC sinterizados convencionalmente e ZrO2/Al2O3-NbC sinterizados por SPS mostraram alta densificação (>97% DT e boas propriedades mecânicas. Os nanocompósitos de t-ZrO2/Al2O3 sinterizados por FS apresentaram uma densificação ultrarrápida (< 1 min) com retração linear superior às amostras sinterizadas em forno convencional, ocorrente a temperaturas inferiores a 1000°C, com densidades relativas superiores a 90% DT em algumas composições. Os nanocompósitos de t-ZrO2/Al2O3-NbC apresentaram propriedades competitivas entre os compósitos sinterizados convencionalmente e por SPS, com dureza e tenacidade à fratura superiores às da t-ZrO2 monolítica. A resistência ao desgaste desses nanocompósitos sinterizados convencionalmente, no entanto, foi notadamente superior à dos sinterizados por SPS. A oxidação do NbC nos compósitos sinterizados convencionalmente influiu negativamente nas propriedades, levando à sugestão de uma \"janela\" de temperaturas em que a sinterização do nanocompósito de t-ZrO2/Al2O3-NbC seja interessante sem a degradação das propriedades mecânicas. Os resultados permitiram concluir que os materiais estudados apresentam potencial para aplicações industriais que requerem cerâmicas de alto desempenho mecânico e de resistência ao desgaste.
High performance ceramic composites have been the subject of frequent studies in recent decades, aiming at improving mechanical properties and increasing their range of applications in technological products. This work consisted in studying the preparation, the conventional and non-conventional sintering and the mechanical properties resulting from two t-ZrO2 matrix composites: the t-ZrO2/Al2O3 system and the t-ZrO2/Al2O3-NbC system. In the t-ZrO2/Al2O3 system, the compositions of 0, 5 and 15% by volume of Al2O3 using commercial powders were studied, while in the t-ZrO2/Al2O3-NbC system, an Al2O3-NbC nanocrystalline powder obtained by high energy reactive milling, deagglomerated, leached in HCl and added in the proportion of 5% by volume to the t-ZrO2 matrix. The obtained powders were uniaxially and isostatically pressed and sintered in conventional furnace and using flash sintering (t-ZrO2/Al2O3) and spark plasma sintering (SPS) (t-ZrO2/Al2O3-NbC). Conventionally sintered t-ZrO2/Al2O3 and conventionally sintered t-ZrO2/Al2O3-NbC composites were characterized by measurements of apparent density, dilatometry, SEM, and mechanical properties: hardness, Young\'s modulus and fracture toughness. The t-ZrO2/Al2O3 composites sintered by FS were characterized by measurements of apparent density, in situ dilatometry and SEM. t-ZrO2/Al2O3-NbC nanocomposites were also characterized for wear strength by the ball-in-disc method, using Al2O3 and WC-6%Co beads as countermaterials. The results showed that the high energy reactive milling was complete and effective in obtaining nanometric powders of Al2O3-NbC, with crystallite sizes equal to 9.1 and 9.7 nm, for Al2O3 and NbC, respectively. The deagglomeration after high energy reactive milling was effective in reducing the size of agglomerates. Conventionally sintered t-ZrO2/Al2O3 and t-ZrO2/Al2O3-NbC composites and SPS-sintered t-ZrO2/Al2O3-NbC showed high densification (> 97% TD), good dispersion of the inclusions in the matrix and good mechanical properties. The t-ZrO2/Al2O3 nanocomposites sintered by FS presented an ultrafast densification (<1 min) with linear shrinkage superior to the sintered samples in conventional furnace, occurring at temperatures lower than 1000°C, with relative densities higher than 90% TD in some compositions. The t-ZrO2/Al2O3-NbC nanocomposites presented competitive properties between conventionally sintered and SPS-sintered composites with higher hardness and fracture toughness than monolithic t-ZrO2. The wear resistance of these conventionally sintered nanocomposites, however, was markedly higher than those of SPS-sintered ones. The oxidation of NbC in the composites sintered conventionally influenced negatively the properties, leading to the suggestion of a \"window\" of temperatures in which the sintering of the t-ZrO2/Al2O3-NbC nanocomposite is interesting without the degradation of the mechanical properties. The results allowed concluding that the studied materials present potential for industrial applications that require high mechanical performance and wear resistance ceramics.
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COUTINHO, ANA C. de S. "Influência da adição de carbetos (NbC,TaC, SiC e TiC) na sinterização de cerâmicas à base de Sisub(3)Nsub(4)." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11351.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:01/01889-4
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PASOTTI, ROSA M. da R. "Obtencao e caracterizacao do composito Alsub2 Osub3-NbC e o efeito da adicao de Ysub2 Osub3 na sua sinterizacao." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10745.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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TONELLO, KAROLINA P. dos S. "Compósitos de alumina com adições de NbC, TaC e TiC para aplicação em ferramentas de corte." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10206.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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RUMBAO, ALEXANDRE H. "Influência da ítria nas propriedades mecânicas e térmicas do compósito Al sub(2) O sub(3) - 20 porcento NbC." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11032.

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Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:00/03079-7
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Silva, J?nior Jos? Ferreira da. "Comportamento da adi??o do carbeto de ni?bio (nBC) na matriz met?lica do a?o ferr?tico 15kH2mfa." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12804.

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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
The 15Kh2MFA steel is a kind of Cr-Mo-V family steels and can be used in turbines for energy generation, pressure vessels, nuclear reactors or applications where the range of temperature that the material works is between 250 to 450?C. To improve the properties of these steels increasing the service temperature and the thermal stability is add a second particle phase. These particles can be oxides, carbides, nitrites or even solid solution of some chemical elements. On this way, this work aim to study the effect of addition of 3wt% of niobium carbide in the metallic matrix of 15Kh2MFA steel. Powder metallurgy was the route employed to produce this metallic matrix composite. Two different milling conditions were performed. Condition 1: milling of pure 15Kh2MFA steel and condition 2: milling of 15Kh2MFA steel with addition of niobium carbide. A high energy milling was carried out during 5 hours. Then, these two powders were sintered in a vacuum furnace (10-4torr) at 1150 and 1250?C during 60 minutes. After sintering the samples were normalized at 950?C per 3 minutes followed by air cooling to obtain a desired microstructure. Results show that the addition of niobium carbide helps to mill faster the particles during the milling when compared with that steel without carbide. At the sintering, the niobium carbide helps to sinter increasing the density of the samples reaching a maximum density of 7.86g/cm?, better than the melted steel as received that was 7,81g/cm?. In spite this good densification, after normalizing, the niobium carbide don t contributed to increase the microhardness. The best microhardness obtained to the steel with niobium carbide was 156HV and to pure 15Kh2MFA steel was 212HV. It happened due when the niobium carbide is added to the steel a pearlitic structure was formed, and the steel without niobium carbide submitted to the same conditions reached a bainitic structure
O a?o 15Kh2MFA, da fam?lia dos a?os CrMoV, pode ser utilizado em turbinas para gera??o de energia, vasos de press?o, reatores nuclear ou aplica??es, onde o material ? submetido a temperaturas de servi?o entre 250 e 450?C. Uma forma de melhorar as propriedades do a?o, para que ele trabalhe a temperaturas mais altas ou que se torne mais est?vel ? adicionar part?culas de segunda fase na sua matriz. Estas part?culas podem estar na forma de ?xidos, carbetos, nitretos ou at? mesmo em solu??o s?lida quando alguns elementos qu?micos s?o adicionados ao material. Neste contexto, este trabalho objetiva estudar o efeito da adi??o de 3% de carbeto de ni?bio na matriz met?lica do a?o 15Kh2MFA. Para isto a metalurgia do p? foi a rota empregada para a produ??o deste comp?sito de matriz met?lica. Para tal, duas moagens distintas foram realizadas. A primeira com o a?o 15Kh2MFA e a segunda com o a?o 15Kh2MFA com adi??o de 3% de carbeto de ni?bio. A moagem de alta energia foi realizada durante 5 horas. Em seguida, os dois p?s produzidos foram sinterizados em um forno a v?cuo (10-4torr) a temperaturas de 1150?C e 1250?C durante 60 minutos. Ap?s a sinteriza??o as amostras foram submetidas ao tratamento t?rmico de normaliza??o a 950?C. Os resultados mostraram que a adi??o do carbeto de ni?bio ajuda o processo de cominui??o das part?culas, quando comparado com o a?o sem o carbeto de ni?bio. O carbeto de ni?bio tem um papel fundamental na densifica??o das amostras durante a sinteriza??o, levando a densidade 7,86g/cm?, que ? maior do que a densidade do a?o fundido recebido que era de 7,81g/cm?. Apesar desta boa densifica??o, ap?s a normaliza??o, o NbC n?o contribuiu de forma significativa para aumento da dureza, onde a melhor dureza obtida para o a?o com NbC foi de 156HV e para o a?o puro foi de 212HV. Isto se deve ao fato de que, quando o NbC foi adicionado ao a?o, formou-se uma estrutura perl?tica, enquanto que, com o a?o sem adi??o de NbC, submetido as mesmas condi??es, obteve-se uma estrutura bain?tica
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Books on the topic "NbC composite"

1

Duffy, Stephen F. Design protocols and analytical strategies that incorporate structural reliability models: Final report; reporting period: January 19, 1996 - January 18, 1997; grant number: NASA cooperative agreement NCC 3-448. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Murakami, Ri-Ichi, Pankaj M. Koinkar, Tomoyuki Fujii, Tae-Gyu Kim, and Hairus Abdullah. NAC 2019: Proceedings of the 2nd International Conference ​on Nanomaterials and ​Advanced Composites. Springer, 2020.

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United States. National Aeronautics and Space Administration., ed. "Composites research in support of the NASP Institute for composites (NIC)": NCC3-218 period covered, June 1, 1991 through August 31, 1994. [Washington, DC: National Aeronautics and Space Administration, 1994.

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"Composites research in support of the NASP Institute for composites (NIC)": NCC3-218 period covered, June 1, 1991 through August 31, 1994. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Caps, John. Big Screen, Little Screen. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252036736.003.0005.

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This chapter details the start of Mancini's successful television career. Although Mancini was no longer a staff composer at Universal, he still retained his studio pass, with which he could enter the movie lot, use the cafeteria, and mingle informally with producers There in mid-1958 he would meet, Blake Edwards, who had just come from a meeting at which plans were solidified for a new TV series slated for September at NBC. When Edwards asked Mancini if he would be interested in composing the music for the new show, to be called Peter Gunn, he had in mind Mancini's arranging and producing the club music that would be needed in the series, because one of the recurring settings of the show would be a small jazz cafe. Mancini proposed that every thirty-minute episode of Peter Gunn should begin with the same chromatic walking bass figure to cover the one-minute teaser in which some robbery, killing, or con was depicted to set up that night's show. A deal was struck; Mancini once again had a job. Music from Peter Gunn later became the number one album in the country on Billboard magazine's charts and stayed there for 10 weeks, remaining charted for 117 weeks in all.
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United States. National Aeronautics and Space Administration., ed. "Creep of refractory fibers and modeling of metal and ceramic matrix composite creep behavior": (NCC-3-119), project closing report. [Washington, DC: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "NbC composite"

1

Zhu, Caihong, Chengwei Wang, Ruihua Chen, and Changhai Ru. "A Novel Composite and Suspended Nanofibrous Scaffold for Skin Tissue Engineering." In EMBEC & NBC 2017, 1–4. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5122-7_1.

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Xiao, Zhi Yu, Tung Wai Leo Ngai, Li Pin Wen, and Yuan Yuan Li. "Preparation of Warm Compacted NbC Reinforced Iron-Based Composite and Its Tribological Behavior." In Progress in Powder Metallurgy, 913–16. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.913.

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Subramanian, S. V., Ma Xiaoping, Nie Wenjin, and Zhang Xiaobing. "Application Of Nano-Scale Precipitate Engineering Of Tin-Nbc Composite In 32Mm K60-E2 Grade Plate Rolling." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 211–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch21.

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Subramanian, S. V., Ma Xiaoping, Nie Wenjin, and Zhang Xiaobing. "Application of Nano-Scale Precipitate Engineering of TiN-NbC Composite in 32mm K60-E2 Grade Plate Rolling." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 211–21. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_21.

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Subramanian, S. V., Ma Xiaoping, and Kashif Rehman. "Austenite Grain Size Control in Upstream Processing of Niobium Microalloyed Steels by Nano-Scale Precipitate Engineering of TiN-NbC Composite." In Energy Materials 2014, 639–50. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48765-6_77.

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Subramanian, S. V., Ma Xiaoping, and Kashif Rehman. "Austenite Grain Size Control in Upstream Processing of Niobium Microalloyed Steels by Nano-Scale Precipitate Engineering of TiN-NbC Composite." In Energy Materials 2014, 639–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119027973.ch77.

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Subramanian, S. V., Ma Xiaoping, Kashif Rehman, and Hatem Zurob. "On Control of Grain Coarsening of Austenite by Nano-Scale Precipitate Engineering of TiN-NbC Composite in Ti-Nb Microalloyed Steel." In Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016), 119–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119328827.ch17.

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Subramanian, S. V., Ma Xiaoping, Kashif Rehman, and Hatem Zurob. "On Control of Grain Coarsening of Austenite by Nano-Scale Precipitate Engineering of TiN-NbC Composite in Ti-Nb Microalloyed Steel." In Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016), 119–24. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48770-0_17.

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Woydt, Mathias, and Hardy Mohrbacher. "Hardmetals Based on Niobium Carbide (NBC) Versus Casted NBC Bearing MMCS." In Mechanical Properties and Performance of Engineering Ceramics and Composites X, 87–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119211310.ch10.

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Gordo, Elena, B. Gómez, Roberto González, and E. M. Ruiz-Navas. "Study for the Development of Fe-NbC Composites by Advanced PM Techniques." In Progress in Powder Metallurgy, 637–40. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.637.

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Conference papers on the topic "NbC composite"

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Subramanian, S. V., Xiaoping Ma, Chengliang Miao, Xiaobing Zhang, and Laurie Collins. "Microstructure Engineering of Thicker Gage Niobium Microalloyed Line Pipe Steel With Enhanced Toughness by High Temperature Processing Using TiN-NbC Composite Precipitate." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64052.

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Prediction of crack arrestability of higher grade line pipe steel microalloyed with niobium in full scale burst tests based on laboratory simulation tests including Charpy impact, DWTT and CTOD is rendered difficult, as the full scale burst test is found to be far more sensitive to microstructure variables than current laboratory tests. This paper deals with nano-scale TiN-NbC composite precipitate engineering as an alternative approach to strain-induced precipitation of NbC to produce thicker gage plate or coil with enhanced toughness and resistance to ductile fracture propagation of line pipe steel. Microstructure engineering is based on identification of key microstructural parameters to which target properties can be related, and engineer the target microstructure through design of base chemistry and optimization of processing schedules. Nano-scale precipitate engineering based on control of spacing and size of TiN-NbC composite precipitate offers a new approach to achieve excellent strength and toughness (300J at −60C) of line pipe steels through control of target microstructure consisting of: (i) refinement of austenite grain size (under 30 microns) of transfer bar before pancaking, (ii) high volume fraction of acicular ferrite with adequate plasticity to increase resistance to ductile fracture propagation, (iii) high density and uniform dispersion of high angle grain boundaries that arrest micro-cracks to suppress brittle fracture initiation, (iv) less intensity of unfavorable {100}<011> texture component that facilitate the propagation of brittle fracture, (v) suppression of ultra-fine precipitates in the matrix, thereby enlarging plastic zone ahead of the crack tip to blunt the tip of the crack, and (vi) suppression of coarse brittle constituents (carbides or MA products) that initiate brittle fracture. Experimental results are presented on thermo-mechanically rolled X-90 and K-60 that validate the concept of microstructure engineering using TiN-NbC composite precipitate engineering to enhance strength and fracture toughness.
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Lopes, M., A. Ramalho, R. Anandkumar, A. Almeida, R. Vilar, and C. Figueiredo-Pina. "WEAR RESISTANCE OF Al–12 WT.% Si REINFORCED WITH NbC PARTICLES BY LASER CLADDING." In BALTTRIB. Aleksandras Stulginskis University, 2017. http://dx.doi.org/10.15544/balttrib.2017.06.

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Al12Si–NbC composite coatings were deposited by laser cladding on a substrate of Al–7Si alloy. The microstructure and wear resistance of the coatings were evaluated in comparison to the properties of the substrate and the matrix alloy. The wear resistance was evaluated using ball-on-plate reciprocating sliding tests using an AISI 52100 steel sphere as counterbody. The coatings microstructure consists of NbC particles dispersed in a matrix of α–Al and α–Al/Si eutectic. The reinforcement with NbC particles induces a considerable increase in the average hardness of the matrix material from 85±1 HV to 147±40 HV and in the respective wear resistance. The wear mechanisms involve oxidation, adhesion with plastic deformation and delamination.
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Subramanian, Sundaresa, Xiaoping Ma, Xuelin Wang, Chengjia Shang, Xiaobing Zhang, Chengliang Miao, and Laurie Collins. "Control of %age Shear Area in DWTT at Low Temperature in Niobium Microalloyed Line Pipe Steel." In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78100.

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Microstructural engineering to obtain 100% shear area in DWTT at low temperature requires target parameters to suppress brittle fracture. In-depth characterization of benchmarked steels has confirmed that %age shear area is decreased by high number density of ultra-fine precipitates (<10nm) that contribute to precipitation strengthening, high intensity of rotated cube texture and coarse brittle constituents like M/A or carbides. The control of these parameters by nano-scale precipitate engineering of TiN-NbC was covered in a previous presentation in IPC 2016 [1]. The present paper focuses on crystallographic variants selection that controls the density and dispersion of high angle boundaries, which arrest microcracks to suppress brittle fracture, thereby increasing %age shear area in DWTT at low temperature. Studies on crystallographic variants selection in single undeformed austenite grain have clarified crystallographic variants configuration which gives rise to high angle boundaries is influenced by hardenability parameters, i.e., alloying, cooling rate and austenite grain size. The profound effect of carbon and solute niobium on density and dispersion of high angle boundaries in CGHAZ is demonstrated by analyzing EBSD data to reconstruct the shear transformation of undeformed austenite using K-S relationship. Moreover, pancaking of austenite influences crystallographic variants through Sv factor and dislocation density. Experimental results on nano-scale TiN-NbC composite precipitate engineered steel confirm that adequate solute niobium (>0.03wt%) is retained in the matrix, which is aided by the suppression of delayed strain induced precipitation of ultra-fine precipitates of NbC. The hardenability from solute niobium is found to be adequate to give high density of high angle boundaries to give about 95% shear area in DWTT at −40°C in 32 mm gage K-60 plate and 100% shear area in 16.3 mm X-90 strip. Both steels were processed by nano-scale precipitate engineering of TiN-NbC composite to control size and uniformity of distribution of austenite grains before pancaking.
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Stone, David, and Melanie Violette. "Composites Workforce, The Next Generation Outreach Through the Composite Materials Merit Badge." In SAMPE 2019 - Charlotte, NC. SAMPE, 2019. http://dx.doi.org/10.33599/nasampe/s.19.1567.

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Lee, Young Seok, Hyun Soo Ryu, Myung-Ha Lee, Jong Cheol Lee, and Ki Ryong Ha. "Modification and Characterization of Silica Nanoparticles for NBR Composite." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_654.

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Ukoba, Kingsley, Samuel Popoola, Olatunde Israel, Patrick Imoisili, and Tien-Chien Jen. "Development and Characterization of Fly Ash Nanoparticles Reinforced Epoxy Resin Composite for Acoustic Applications." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23708.

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Abstract Noise is an unwanted sound; requires reduction and control through the use of absorptive materials. This is imperative due to the adverse effect noise poses to human health, knowledge dissemination, and tranquility which is increasing daily due to industrialization and heightened allied activities. The use of natural and synthetic reinforced composites in noise pollution control is an emerging area of research. This study aims to develop and characterize fly ash nanoparticles reinforced epoxy resin composite for acoustic applications. Samples were prepared with fly ash nanoparticles reinforcement at 5%, 10%, 15%, 20%, and 25% and investigation of noise reduction coefficient (NRC), porosity and mechanical properties (hardness, impact, flexural strength) of samples were done. Cenospheres were obtained when fly ash particles were characterized separately with the aid of sieve analysis and x-ray fluorescence analysis. The cenospheres are hollow spherical and lightweight, inertfiller material. Correlation between porosity of the samples and their sound absorption properties was observed and showed that as porosity increased, the NRC values increased and as the porosity decreased the NRC values decreased. It was also observed that heat of polymerization, fly ash nanoparticles structure and air bubbles during sample preparation (mixing) influenced the porosity values which in turn influenced the NRC values of the composite. There was also a steady decrease in mechanical properties, as reinforcements were added (5%, 10%, 15%, 20%, and 25%), this was attributed to the high surface areas and shape of reinforcement added.
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Musho, T. D., and D. G. Walker. "Quantum Simulation of Nanocrystalline Composite Thermoelectric Properties." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89332.

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For the past few years, nanoscale structures have been proposed and investigated experimentally for their enhanced thermoelectric properties over bulk materials. These structures offer several advantages: 1) increased local density of states, which can improve the Seebeck coefficient and 2) reduced thermal transport due to phonon confinement and increased scattering. Recently, nanocrystalline composites (NCC) have been examined for their ability to outperform the alloy limit in terms of reduced thermal conductivity. However, the electrical performance has not been examined from a quantum point of view. This work provides quantum simulations of a two-dimensional composite system meant to model certain geometric features of NCC’s. While the results cannot be quantitatively compared to actual measurements, they show how their electrical behavior differs from well-known superlattice devices. This work will aid in the design of the next generation of NCC devices for thermoelectric performance.
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Yarlagadda, Shridhar, Suresh Advani, Joseph Deitzel, Dirk Heider, Dan Molligan, David Roseman, Pavel Simacek, John Tierney, and John Gillespie, Jr. "Formability of TUFF Composite Blanks." In SAMPE 2019 - Charlotte, NC. SAMPE, 2019. http://dx.doi.org/10.33599/nasampe/s.19.1606.

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Agrawal, Animesh, and Paul Calvert. "Fiber reinforced hydrogel composite assembly." In 2009 IEEE 35th Annual Northeast Bioengineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/nebc.2009.4967744.

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Haque, Ejaz, Joyanta Goswami, Robert Moon, Douglas Fox, and Kyriaki Kalaitzidou. "Fiberglass Composite Reinforcement with Nanocellulose Fiber Sizing." In SAMPE 2019 - Charlotte, NC. SAMPE, 2019. http://dx.doi.org/10.33599/nasampe/s.19.1385.

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Reports on the topic "NbC composite"

1

Shailendra Varma. Super-High Temperature Alloys and Composites from NbW-Cr Systems. Office of Scientific and Technical Information (OSTI), December 2008. http://dx.doi.org/10.2172/952944.

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M. G. Jenkins, E. Lara-Curzio, and W. Windes. Roadmap to NRC Approval of Ceramic Matrix Composites in Generation IV Reactors. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/911712.

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Carus, Michael, Asta Eder, Lara Dammer, Hans Korte, Lena Scholz, Roland Essel, Elke Breitmayer, and Martha Barth. Wood-Plastic Composites (WPC) and Natural Fibre Composites (NFC): European and Global Markets 2012 and Future Trends in Automotive and Construction. Nova-Institut GmbH, June 2015. http://dx.doi.org/10.52548/thsz9515.

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Lampo, Richard G., Barry K. Myers, Karl Palutke, and Darryl M. Butler. Remote Performance Monitoring of a Thermoplastic Composite Bridge at Camp Mackall, NC. Fort Belvoir, VA: Defense Technical Information Center, November 2011. http://dx.doi.org/10.21236/ada576173.

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Henshall, G. A., M. J. Strum, P. R. Subramanian, and M. G. Mendiratta. Simulations of creep in ductile-phase toughened Nb{sub 5}Si{sub 3}/Nb in-situ composites. Office of Scientific and Technical Information (OSTI), November 1994. http://dx.doi.org/10.2172/161524.

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Lampo, Richard, Thomas Nosker, George Nagle, Sarah Nemeth, Karl Palutke, and Lawrence Clark. Demonstration of thermoplastic composite I-beam design bridge at Camp Mackall, NC : final report on Projects FY08-16 and FY09-31. Construction Engineering Research Laboratory (U.S.), January 2018. http://dx.doi.org/10.21079/11681/26030.

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