Academic literature on the topic 'MFA thesis in Ceramics'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'MFA thesis in Ceramics.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "MFA thesis in Ceramics"
1
Akins, Jennifer. "Establishing an Open-Access MFA Thesis Collection." Art Documentation: Journal of the Art Libraries Society of North America 37, no. 1 (2018): 44–54. http://dx.doi.org/10.1086/697271.
Full text
2
Vasconcelos, J. S., N. S. L. S. Vasconcelos, S. M. Zanetti, et al. "Filmes finos de SrBi2Ta2O9 processados em forno microondas." Cerâmica 49, no. 309 (2003): 61–65. http://dx.doi.org/10.1590/s0366-69132003000100013.
Full textAbstract:
Filmes finos de SrBi2Ta2O9 foram depositados em substratos de Pt/Ti/SiO2/Si e, pela primeira vez, sinterizados em forno microondas doméstico. Os padrões de difração de raios X mostraram que os filmes são policristalinos. O processamento por microondas permite utilizar baixa temperatura na síntese e obter filmes com boas propriedades elétricas. Ensaios de microscopia eletrônica de varredura (MEV) e de Força Atômica (MFA) revelam boa aderência entre filme e substrato, com microestrutura de superfície apresentando grãos finos e esféricos e rugosidade de 4,7 nm. A constante dielétrica e o fator de dissipação, para freqüência de 100 KHz, à temperatura ambiente, foram de 77 e 0,04, respectivamente. A polarização remanescente (2Pr) e o campo coercitivo (Ec) foram 1,04 miC/cm² e 33 kV/cm. O comportamento da densidade de corrente de fuga revela três mecanismos de condução: linear, ôhmico e outro mecanismo que pode ser atribuído à corrente de Schottky. Dos padrões de DRX, análises das imagens por MEV e topografia de superfície por MFA observa-se que 10 min de tratamento térmico a 550 ºC, em forno microondas, é tempo suficiente para se obter a cristalização do filme.
3
Motiram-Corral, Kumar, Míriam Pérez-Trujillo, Pau Nolis, and Teodor Parella. "Implementing one-shot multiple-FID acquisition into homonuclear and heteronuclear NMR experiments." Chemical Communications 54, no. 96 (2018): 13507–10. http://dx.doi.org/10.1039/c8cc08065h.
Full textAbstract:
The concept of multiple-FID acquisition (MFA) within the same scan is applied to acquire simultaneously multiple 2D spectra from a single NMR experiment. A discussion on the incorporation of the MFA strategy in homonuclear and heteronuclear pulse sequences is presented. Several novel COSY- and HMBC-type experiments are reported as a time-efficient solution in small-molecule NMR spectroscopy.
4
Rangel, J. H. G., F. M. L. Pontes, E. R. Leite, and J. A. Varela. "Filmes finos de Titanato de Chumbo e Lantânio - PLT: influência do pH." Cerâmica 46, no. 300 (2000): 181–85. http://dx.doi.org/10.1590/s0366-69132000000400003.
Full textAbstract:
Filmes finos de PbTiO3 dopados com 27% de lantânio, depositados em substratros MgO (100), foram preparados pelo método dos precursores poliméricos (Pechini). As resinas, das quais são obtidos os filmes, ao término do processo apresentam pH entre 2-3. Este fato promove o aparecimento de cristais de citrato de Pb (favorecido pelo meio ácido). Para evitar tal problema, o pH da resina foi mantido entre 7-8 pela adição de hidróxido de amônio. O surgimento de regiões mais ricas em chumbo pode ser visto por intermédio de Microscópio Eletrônico de Varredura (MEV) e confirmada pela análise de EDS. A Microscopia de Força Atômica (MFA) também foi utilizada na observação da superfície dos filmes.
5
Correoso Ródenas, José Manuel. "“Something Awful”: fronteras difusas y conexiones místicas entre lo animal, lo humano y lo divino en dos relatos de Flannery O’Connor." Pangeas. Revista Interdisciplinar de Ecocrítica, no. 1 (December 15, 2019): 63. http://dx.doi.org/10.14198/pangeas2019.1.06.
Full textAbstract:
El objetivo de este artículo es poner de relieve dos de los relatos que Flannery O’Connor incluyó en su MFA Thesis en el Iowa Writers’ Workshop (1947): “Wildcat” y “The Turkey”. En ambos, como se puede desprender de los títulos, aparecen animales que tienen una capital importancia para el desenlace de las historias. En ambos, también, aparecen hombres (o niños) cuya vida está ligada a la de estos animales. No obstante, tanto el gato salvaje como el pavo silvestre, bajo la óptica que Flannery O’Connor ofrece, no son sólo representantes del mundo animal, sino que se erigen en modos o vías de unión con la divinidad. A través de ellos, los personajes humanos pueden trascender el mundo terreno y alcanzar lo intangible, descubriendo, muchas veces, que esta otra realidad es más terrible de lo que imaginaban. Ambas bestias son dignas poseedoras de los “mystery and manners” que la escritora de Milledgeville situaba en el centro de su producción: son (y encarnan) un misterio y, a la vez, buscan las costumbres de los hombres para arrastrarlos al otro lado. En estos textos, las fronteras entre lo humano, lo animal y lo divino parecen desaparecer, creando un continuo híbrido a tres bandas del que se torna imposible escapar para los protagonistas. La muerte, como puerta, será la única salida que encuentren.
6
Bonte, Dries, Bart Derynck, Patrick De Baets, Wim De Waele, and Koen Faes. "Friction welding of ceramics to metals." International Journal Sustainable Construction & Design 1, no. 1 (2010): 14–20. http://dx.doi.org/10.21825/scad.v1i1.20390.
Full textAbstract:
This paper discusses the progress in a master thesis about friction welding of ceramics to metals. An existing friction welding machine has to be adapted for the experimental part of this research. The required capabilities of this machine are discussed in this paper. As an introduction, a general explanation about friction welding is given. The results of a literature survey on friction welding of ceramics to metals are discussed. The aim of this survey was to determine the process parameters required to obtain a good weld quality. It became clear that few literature exists on friction welding of these materials and that the cited values for the process parameters vary widely. Based hereon, a range of process parameter values was used to make certain design choices. Because a laboratory machine is aimed at, it has to be able to function at varying settings of the process parameters, including testing at higher rotational speeds. Finally, process windows illustrating sound combinations of friction pressure and specimen diameter are calculated. The design choices entail certain restrictions on the capabilities of the machine. These restrictions define the boundaries of the process window
7
Thanh, Luong Duy, and Rudolf Sprik. "A study on the variation of zeta potential with mineral composition of rocks and types of electrolyte." VIETNAM JOURNAL OF EARTH SCIENCES 40, no. 2 (2018): 109–16. http://dx.doi.org/10.15625/0866-7187/40/2/11091.
Full textAbstract:
Streaming potential in rocks is the electrical potential developing when an ionic fluid flows through the pores of rocks. The zeta potential is a key parameter of streaming potential and it depends on many parameters such as the mineral composition of rocks, fluid properties, temperature etc. Therefore, the zeta potential is different for various rocks and liquids. In this work, streaming potential measurements are performed for five rock samples saturated with six different monovalent electrolytes. From streaming potential coefficients, the zeta potential is deduced. The experimental results are then explained by a theoretical model. From the model, the surface site density for different rocks and the binding constant for different cations are found and they are in good agreement with those reported in literature. The result also shows that (1) the surface site density of Bentheim sandstone mostly composed of silica is the largest of five rock samples; (2) the binding constant is almost the same for a given cation but it increases in the order KMe(Na+) < KMe(K+) < KMe(Cs+) for a given rock.References Corwin R. F., Hoovert D.B., 1979. The self-potential method in geothermal exploration. Geophysics 44, 226-245. Dove P.M., Rimstidt J.D., 1994. Silica-Water Interactions. Reviews in Mineralogy and Geochemistry 29, 259-308. Glover P.W.J., Walker E., Jackson M., 2012. Streaming-potential coefficient of reservoir rock: A theoretical model. Geophysics, 77, D17-D43. Ishido T. and Mizutani H., 1981. Experimental and theoretical basis of electrokinetic phenomena in rock-water systems and its applications to geophysics. Journal of Geophysical Research, 86, 1763-1775. Jackson M., Butler A., Vinogradov J., 2012. Measurements of spontaneous potential in chalk with application to aquifer characterization in the southern UK: Quarterly Journal of Engineering Geology & Hydrogeology, 45, 457-471. Jouniaux L. and T. Ishido, 2012. International Journal of Geophysics. Article ID 286107, 16p. Doi:10.1155/2012/286107. Kim S.S., Kim H.S., Kim S.G., Kim W.S., 2004. Effect of electrolyte additives on sol-precipitated nano silica particles. Ceramics International 30, 171-175. Kirby B.J. and Hasselbrink E.F., 2004. Zeta potential of microfluidic substrates: 1. Theory, experimental techniques, and effects on separations. Electrophoresis, 25, 187-202. Kosmulski M., and Dahlsten D., 2006. High ionic strength electrokinetics of clay minerals. Colloids and Surfaces, A: Physicocemical and Engineering Aspects, 291, 212-218. Lide D.R., 2009, Handbook of chemistry and physics, 90th edition: CRC Press. Luong Duy Thanh, 2014. Electrokinetics in porous media, Ph.D. Thesis, University of Amsterdam, the Netherlands. Luong Duy Thanh and Sprik R., 2016a. Zeta potential in porous rocks in contact with monovalent and divalent electrolyte aqueous solutions, Geophysics, 81, D303-D314. Luong Duy Thanh and Sprik R., 2016b. Permeability dependence of streaming potential coefficient in porous media. Geophysical Prospecting, 64, 714-725. Luong Duy Thanh and Sprik R., 2016c. Laboratory Measurement of Microstructure Parameters of Porous Rocks. VNU Journal of Science: Mathematics-Physics 32, 22-33. Mizutani H., Ishido T., Yokokura T., Ohnishi S., 1976. Electrokinetic phenomena associated with earthquakes. Geophysical Research Letters, 3, 365-368. Ogilvy A.A., Ayed M.A., Bogoslovsky V.A., 1969. Geophysical studies of water leakage from reservoirs. Geophysical Prospecting, 17, 36-62. Onsager L., 1931. Reciprocal relations in irreversible processes. I. Physical Review, 37, 405-426. Revil A. and Glover P.W.J., 1997. Theory of ionic-surface electrical conduction in porous media. Physical Review B, 55, 1757-1773. Scales P.J., 1990. Electrokinetics of the muscovite mica-aqueous solution interface. Langmuir, 6, 582-589. Behrens S.H. and Grier D.G., 2001. The charge of glass and silica surfaces. The Journal of Chemical Physics, 115, 6716-6721. Stern O., 1924. Zurtheorieder electrolytischendoppelschist. Z. Elektrochem, 30, 508-516. Tchistiakov A.A., 2000. Physico-chemical aspects of clay migration and injectivity decrease of geothermal clastic reservoirs: Proceedings World Geothermal Congress, 3087-3095. Wurmstich B., Morgan F.D., 1994. Modeling of streaming potential responses caused by oil well pumping. Geophysics, 59, 46-56.
8
Li, Man, and Wei Ping Hu. "Application Study of Costume Materials in Interior Decoration." Advanced Materials Research 460 (February 2012): 236–39. http://dx.doi.org/10.4028/www.scientific.net/amr.460.236.
Full textAbstract:
Through the successful application of the home improvement materials like ceramics and PVC materials in the costume design, the thesis analyzed costume materials’ adhibition in the interior decoration and introduced the nanofiber materials, milk fiber, phase-change materials as well as high-tech fabrics into the home fabric decorations so as to improve the comfortableness, health and security of home lives; and it also accorded with the green initiative and organic theme of the social development in the future.
9
Fabian, Stanislav, and Luba Bicejova. "Technological Head Tilt Angle Influence Analysis to Generation of Vibration during Ceramics Material Machining by Means of AWJ Technology." Applied Mechanics and Materials 616 (August 2014): 175–82. http://dx.doi.org/10.4028/www.scientific.net/amm.616.175.
Full textAbstract:
The thesis deals with a manufacturing system water jet technological head tilt angle influence analysis. The search is performed for two tilt angles and three speeds of the technological head shift. Frequency envelope comparative graphs are created for the head tilt angles 45o and 90o and for each of three speeds using graphical records which show vibration acceleration amplitude relation to its frequency. For each of the tilt angles summary comparative frequency envelope graphs in all analyzed speeds are created, too. On the base of the comparative frequency envelope graphs a discussion focused on results and formulated conclusion are performed. The paper presents a thematically integrated part of previous research and complements recent knowledge on technological and material parameter impact to water jet technology manufacturing system vibration generation.
10
Liu, Jing, Hui Zhang, Jun Li, Da Chuan Chen, and Yan Kun Tang. "Study on Displacement Measurement for Induced Strain Field Based on Digital Speckle Pattern Interferometry Method." Applied Mechanics and Materials 273 (January 2013): 510–14. http://dx.doi.org/10.4028/www.scientific.net/amm.273.510.
Full textAbstract:
Digital Speckle Pattern Interferometry ( DSPI for short ) method has become one of the most practical worthy techniques for speckle measuring methods with the high-speed development of optic-electronical technique, image processing technology and electronic computer technology. There is a lot of advantages about it, such as uncomplicated operation, non-contacting, advanced automatic level, measurement on-line and extensive using. In this thesis, the displacement variation of the induced strain field for driving by piezoelectric ceramics can be measured by using this method. Thus we can come to a conclusion that digital speckle pattern interferometry is a new measuring method for extracting small-signal. It also provides a powerfully theoretical and experimental platform for study of automated, full-field, high-precision and nondestructive measurement.
Dissertations / Theses on the topic "MFA thesis in Ceramics"
1
Dagam, Sarah A. "The Effects of Life Experiences." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1461679558.
Full text
2
Hulings, Quinn A. "Hugging The Fog." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1333651801.
Full text
3
Porobic, Damir Verona. "MFA thesis exhibition." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4189.
Full textAbstract:
Thesis (M.F.A.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains vi, 30 p. : ill. (some col.). Includes a video file in the QuickTime format. Includes abstract. Includes bibliographical references (p. 30).
4
Wessman, Stina. "MFA thesis Stina Wessman : BäddBoken sängliggande aktiviteter." Thesis, Konstfack, Experience Design, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-3039.
Full text
5
Degges, Douglas Ross. "Master of fine arts thesis." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2854.
Full textAbstract:
In the course of studying painting for the past three years at the University of Iowa, I have found collaborating with other artists to be a great way for me to try on different hats. Two of these collaborations in particular, The Old Man Study Group with Hamlett Dobbins (Memphis, TN) and The Coracle Drawing Club with David Dunlap (Iowa City, IA), have given me the license and opportunity to pretend to be someone else. These collaborative projects have asked me to consider, and at times adopt, even if only for a moment, the interests and concerns of another maker. A few months into these two projects, I noticed that the work I was making on my own, in the isolation of my own studio, was suddenly open to the world's innovations, and not just my own.
6
Sarama, Brian C. "Daydreams." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1343427052.
Full text
7
Cuevas, Santamaría Sergio Axel. "My MFA Experience." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524073680662621.
Full text
8
Strickler, Jason A. "Drift." Claremont Graduate University, 2010. http://ccdl.libraries.claremont.edu/u?/stc,78.
Full text
9
Winchester, Rachel. "Dance as Literary Criticism: Literary Analysis and Dramaturgy in a Dance Theatre Choreographic Process." Thesis, University of Oregon, 2014. http://hdl.handle.net/1794/18356.
Full textAbstract:
In my research into interdisciplinary choreographic processes, I found there to be a lacking representation of recent scholarship dedicated to exploring the relationship between literature and dance. As a dance theatre choreographer who often utilizes textual sources as impetuses for artistic creation, I have employed methods of traditional dramaturgy in my practice and, in seeking scholarship on this subject, have noted a need for clear examples of dance dramaturgy in practice. In this thesis study, I employed methods from literary studies and dramaturgy in the process of adapting a work of short fiction by Kurt Vonnegut for the stage. I documented my process and have structured the information for the benefit of those who may read it. The artistic product of this research was presented to an audience in direct relation to its literary source. At the conclusion of this research, I posit that dance can function as literary criticism.
10
Sines, Benjamin P. "Letters of a Ruined House." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2007.
Full textBooks on the topic "MFA thesis in Ceramics"
1
Junge, Andrew Benedict. Andrew Junge's 1980 Chevrolet van owner's and driver's auxiliary information manual and MFA thesis: (a self-portrait). 2002.
Find full text
2
Rosenberg, Michael, and Aslı Erim-Özdoğan. The Neolithic in Southeastern Anatolia. Edited by Gregory McMahon and Sharon Steadman. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780195376142.013.0006.
Full textAbstract:
This article presents data on Neolithic sites in southeastern Anatolia, where, as elsewhere in southwestern Asia, the changes attendant on the Neolithic, while revolutionary in their consequences for the evolution of human cultural and social systems, were gradual. In the Early Aceramic we see the development of sedentary communities based on important economic changes, but ones that still retain major elements of the earlier hunter-gatherer, egalitarian social system. However, those elements are now buttressed with institutions (e.g., general-purpose public buildings, feasting) that permit the now somewhat larger communities to remain intact on a long-term basis and to act as a whole. In the Mature Aceramic (MA), we see some of those same institutions (public buildings and spaces) evolving to (of necessity) more strongly promote group identity at the community level in the still-larger communities that characterize the MA. Beginning in the MA III and continuing through the early part of the Pottery Neolithic, we see the gradual disintegration of the Aceramic Neolithic lifeway and its replacement by one that is quite different, wherein kinship appears to play a larger, more formal role. These social changes are intertwined with important economic changes (the development of the full southwestern Asia domesticate complex) and technological changes (the widespread adoption of ceramic technology), but the specifics of how they are related remains an open question.
Book chapters on the topic "MFA thesis in Ceramics"
1
Naremore, James. "Killer of Sheep (1977)." In Charles Burnett. University of California Press, 2017. http://dx.doi.org/10.1525/california/9780520285521.003.0003.
Full textAbstract:
This chapter discusses Burnett’s most celebrated film, which was completed as an MFA thesis and became one of the first movies to be designated by the Library of Congress as a national treasure. Shot on weekends using residents of Watts as actors and crew, Killer of Sheep describes the everyday life of a man who works in a sheep slaughterhouse. A film made up of short vignettes, it gives an alternately sad, humorous, and grim account of a black father who struggles for the survival of his family.
2
Orrù, Roberto, and Giacomo Cao. "Self-Propagating High-Temperature Synthesis (SHS) and Spark Plasma Sintering (SPS) of Zr-, Hf-, and Ta-Based Ultra-High Temperature Ceramics." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4066-5.ch009.
Full textAbstract:
The identification of efficient techniques for the fabrication of Ultra High Temperature Ceramics (UHTCs) is very crucial in view of their rapid and wider development. Along these lines, the use of the self-propagating high-temperature synthesis (SHS) technique in combination with the SPS technology is examined in this chapter for the obtainment of fully dense MB2-SiC and MB2-MC-SiC (M=Zr, Hf, Ta) ceramics. The starting reactants are first processed by SHS to successfully form the desired composites. The resulting powders are subsequently consolidated by spark-plasma sintering (SPS). Bulk products with relative densities = 96% can be obtained within 30 minutes, when the dwell temperature is 1800 °C and P=20 MPa. Hardness, fracture toughness, and oxidation resistance of the obtained dense bodies are comparable to, and in some cases superior than, those reported for analogous products synthesized using alternative routes. Possible future developments of this approach with the final purpose of obtaining whiskers/fibers reinforced UHTCs are finally discussed.
3
Zhang, Weigang, Changming Xie, Xi Wei, and Min Ge. "C/C-ZrB2-ZrC-SiC Composite Derived from Polymeric Precursor Infiltration and Pyrolysis." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4066-5.ch014.
Full textAbstract:
Part II. Mechanical and ablation properties of the 2D C/C-ZrB2-ZrC-SiC composites with a fiber volume fraction of 17.6%, fabricated by infiltration and co-pyrolysis of blended polymeric precursors, were studied in this Part II. Flexural strength and fracture toughness of the composites were found to be influenced strongly by the thickness of the deposited pyrolytic carbon interphase, a composite with the pyrolytic carbon volume fraction of 22.3% exhibits improved bending strength and fracture toughness of 127.9 MPa and 6.23 MPa·m1/2, respectively. The pseudo-plastic strain to failure of the composite is ascribed to sliding of the interphase and pulling out of carbon fibers from the brittle ceramics matrix. Ablation properties of the composite were investigated with a plasma torch and arc-heated wind tunnel tests at temperatures above 1800~2200°C. The composite exhibits very low ablation rates of 0.18×10-3 mm/s at 1800°C and 0.37×10-3 mm/s at 2000°C in the plasma torch after 1000s testing, as compared to a similar rate of 0.30×10-3 mm/s in the wind tunnel at 1900°C after 600s testing. Ablation rates increase with increasing of temperatures from 1800 to 2200°C. The maximum ablation rate is only 1.67×10-3 mm/s in a plasma torch at 2200°C for 1000s, decreased by 71.0% as compared with the C/C-SiC composite with the same fiber and interphase contents. The 2D C/C-ZrB2-ZrC-SiC composite simultaneously showed excellent thermal shock resistance, on account of no cracks on the surface and breakage of the material being detected after these abrupt temperature increasing and long time ablations. The heating-up rate at the center of the composite specimen was found as high as above 30K/s in the plasma torch tests. Excellent ablation and thermal shock resistances of the composite can be attributed to its architecture of carbon fiber and interphase, as well as its matrix microstructures characterized by nano sized dispersions of ZrB2-Zr-SiC phases inherent formed by co-pyrolysis of three polymeric precursors. These meso- and microstructures make the composites possess very small and steady coefficients of thermal expansion (CTE) around 1.5~2.5×10-6/K and high thermal conductivities around 10~14 W/mK (which increases with increasing of temperature) from room temperature to 1300°C, respectively. Surface products and cross sectional morphologies of the composite after the ablation tests were also investigated using SEM and XRD, it was found that a homogeneous distributed and continuous glass layer composing of ZrO2-SiO2 with zirconia as a skeleton was in-situ formed. These special features of coating benefits from the merits of matrix microstructures, and inhibits the inward diffusion of oxygen and protects the composite from further oxidation and spalled off by strong gas fluid.
Conference papers on the topic "MFA thesis in Ceramics"
1
Ross, Daniel, Yanming Wang, Hadyan Ramadhan, and Hitomi Yamaguchi. "Polishing Characteristics of Transparent Polycrystalline YAG Ceramics Using Magnetic Field-Assisted Finishing." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8766.
Full textAbstract:
Transparent polycrystalline yttrium aluminum garnet (YAG) ceramics have garnered an increased level of interest for high-power laser applications due to their ability to be manufactured in large sizes, and doped in relatively substantial concentrations when compared to traditional single-crystalline gain media. However, surface characteristics have a direct effect on the lasing ability of these materials, and a lack of a fundamental understanding of the polishing mechanisms of these ceramics remains a challenge for their utilization. The aim of this paper is to study the polishing characteristics of YAG ceramics using magnetic field-assisted finishing (MAF). An experimental setup was developed, through the refinement of the MAF process, for YAG ceramic workpieces. Using this equipment with diamond abrasives, the YAG ceramic surfaces were polished to sub-nanometer scale. Polishing trials with fine diamond abrasive and colloidal silica were then performed on this sub-nanometer surface and the material removal mechanisms were analyzed. Polishing with 0–0.1 μm diameter diamond abrasive caused increasing roughness with polishing time due to the continuous cycle of relatively substantial chipping followed by minor smoothing. Polishing with colloidal silica caused valleys to widen with increased polishing time and the grain structure of the ceramic influenced the material removal.
2
Wenglarz, Richard A., Satish M. Calcuttawala, and J. Edward Pope. "Ceramic Vane Demonstration in an Industrial Turbine." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-155.
Full textAbstract:
A U. S. Department of Energy (DOE) program with the Allison Engine Company will demonstrate ceramic vanes in an industrial turbine. First-stage ceramic vanes and their metallic mounts are to be designed, fabricated, and operated in a relatively short-term engine test (up to 50 hr). The ceramic vanes and mounts will then be retrofitted into an existing turbine for operation at a commercial site for an extended duration test (up to 8000 hr). The ceramic vanes and metallic mounts have been designed. Thermal and stress analyses of the vanes have calculated acceptable fast fracture stress levels and probabilities of survival exceeding 99.99% for turbine continuous power and emergency shutdown (thermal shock) conditions. The maximum calculated steady-state stress is 169 MPa (24.5 ksi) at a material temperature of 1182°C (2160°F). Consequently, currently available ceramics appear to provide acceptable fast fracture strengths for use in industrial turbines. Long-term materials tests will evaluate the life times and retained strength of ceramics at stress and temperature levels in the range calculated from the ceramic vane analyses. The results of these tests will support the decision on which vane material will be used in the long duration turbine demonstration. A successful demonstration could provide a basis for incorporating first-stage ceramic vanes into current generation industrial turbines and also the introduction of ceramic airfoils into downstream rows of future high temperature Advanced Turbine System (ATS) engines.
3
Watanabe, Makoto, and Hiroshi Ogita. "Evaluation of Ceramic Rotor Strength by Cold and Hot Spin Tests." 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-460.
Full textAbstract:
Presently in Japan 100 kW ceramic gas turbines (CGT) for automobiles are under development, parts of which include a turbine rotor, scrolls, a combustor, and other parts made of ceramics and ceramic matrix composites. The rotor is designed to rotate at 110,000 rpm, equal to the maximum stress of 300 MPa and to be exposed to temperatures up to 1350°C. Initially, the strength of ceramic rotors was evaluated by a burst test using a cold spin tester. The burst picture was observed and compared with the 4pt bending strength of the ceramic test specimens. Next, the strength of the rotors was tested by a hot spin test and the burst result of the rotor was evaluated. A high speed camera was used to observe the rotor at the instant of burst under a high temperature condition. Applying the result of the cold and hot spin tests, ceramics for turbine rotor were selected and the shape of the rotor was designed as a practical automotive engine began in 1990 as a project of the Petroleum Energy Center with financial support from the Agency of Natural Resources and Energy, the Ministry of International Trade and Industry. In order to obtain a 40% or higher thermal efficiency, the automotive gas turbine requires the use of a turbine rotor, combustor, shroud and other engine parts that can withstand high temperatures of 1200°C to 1500°C. In addition, since their resistance to thermal stress and impact are primary considerations, it is necessary to develop high heat-resistant materials (ceramic type materials). Fig. 1 shows a sectional model of the automotive ceramic gas turbine now under development. Under this project, a monolithic ceramic rotor was first evaluated as a turbine rotor. Ceramic matrix composites were then studied.
4
Choi, Sung R., D. Calvin Faucett, and Brenna Skelley. "Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading: Commonality of Slow Crack Growth in Advanced Ceramics." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27325.
Full textAbstract:
An extensive experimental work for Pyroceram™ 9606 glass-ceramic was conducted to determine static fatigue at ambient temperature in distilled water. This work was an extension and companion of the previous work conducted in dynamic fatigue. Four different applied stresses ranging from 120 to 170 MPa was incorporated with a total of 20–23 test specimens used at each of four applied stresses. The slow crack growth parameters n and D were found to be n = 19 and D = 45 with a coefficient of correlation of rcoef = 0.9653. The Weibull modulus of time to failure was in a range of msf = 1.6 to 1.9 with an average of msf = 1.7±0.2. A life prediction using the previously-determined dynamic fatigue data was in excellent agreement with the static fatigue data. The life prediction approach was also applied to advanced monolithic ceramics and ceramic matrix composites based on their dynamic and static fatigue data determined at elevated temperatures. All of these results indicated that a SCG mechanism governed by a power-law crack-growth formulation was operative, a commonality of slow crack growth in these materials systems.
5
Mahmoudi, Mohammadreza, Scott R. Burlison, Salvador Moreno, and Majid Minary. "Freeform 3D-Printing of Pure Ceramics." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23429.
Full textAbstract:
Abstract Polymer derived ceramics (PDC’s) offer a unique opportunity to 3D-print ceramics; however, 3D printing of such polymers require it to be combined with specialized light-sensitive agents and layer-by-layer crosslinking using an optical beam due to their low viscosity. Here, three-dimensional printing of ceramics enabled by dispensing the preceramic polymer from a nozzle inside a yield stress fluid is being demonstrated. The printed parts are crosslinked in the same gel. After crosslinking process, the printed parts are taken out of the gel and prepared for high temperature pyrolysis process that converts the cured parts to ceramic. The specially designed gel was three orders of magnitude more viscous than the preceramic polymer at no shear, which provided a stable medium during the whole process for maintaining the shape of the printed material and prevented possible instabilities. The SEM images of the cross section of the specimens showed that the printed material was dense and without any apparent porosity or cracks. Statistical analysis on the mechanical properties of the printed preceramic polymer specimens revealed that the printed specimens had characteristic strength (∼257 MPa).
6
Selverian, J. H., Dave A. ONeil, and Shinhoo Kang. "Performance Testing and Strength Prediction of Ceramic-to-Metal Joints." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-412.
Full textAbstract:
Brazed joints were made between silicon nitride and Ni-based and Fe-based super alloys. Room temperature shear (torsion) strengths ranged from 75–242 MPa for Si3N4-to-Incoloy 909 joints and from 30–127 MPa for the Si3N4-to-Inconel 718 joints. At 500 °C the joint strength was 120 MPa while at 650°C and 950°C the joints strengths were less than 20 MPa. These low strengths at 650°C and 950°C were attributed to a reduction in the shrink-fit and to low braze strength at these high temperatures. Finite element analysis (FEA) and a probabilistic failure theory (CARES) were used to predict the joint strengths. The predicted joint strengths agreed well with measured joint strengths in torsional loading at 20°C. Torsion tests were also performed at 650°C. Aspects of the material systems, residual stresses, mechanical behavior, and strength predictions are presented. Two new braze alloys based on the Au-Ni-Cr-Fe system were used to overcome the poor high temperature strength. Joints made with these brazes had good strength (85 MPa and 35 N-m) at 650°C.
7
McEntire, B. J., R. R. Hengst, W. T. Collins, et al. "Ceramic Component Processing Development for Advanced Gas-Turbine Engines." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-120.
Full textAbstract:
Norton/TRW Ceramics (NTC) is performing ceramic component development as part of the DOE-sponsored Advanced Turbine Technology Applications Project (ATTAP). NTC’s work is directed at developing manufacturing technologies for rotors, stators, vane-seat platforms and scrolls. The first three components are being produced from a HIPed Si3N4, designated NT154. Scrolls were prepared from a series of siliconized silicon-carbide (Si-SiC) materials designated NT235 and NT230. Efforts during the first three years of this five-year program are reported. Developmental work has been conducted on all aspects of the fabrication process using Taguchi experimental design techniques. Appropriate materials and processing conditions were selected for powder beneficiation, densification and heat-treatment operations. Component forming has been conducted using thermal-plastic-based injection molding (IM), pressure slip-casting (PSC), and Quick-Set™ injection molding. An assessment of material properties for various components from each material and process were made. For NT154, characteristic room-temperature strengths and Weibull Moduli were found to be range between ≈920 MPa to ≈1 GPa and ≈10 to ≈19, respectively. Process-induced inclusions proved to be the dominant strength limiting defect regardless of the chosen forming method. Correction of the lower observed values is being addressed through equipment changes and upgrades. For the NT230 and NT235 Si-SiC, characteristic room-temperature strengths and Weibull Moduli ranged from ≈240 to ≈420 MPa, and 8 to 10, respectively. At 1370°C, strength values for both the HIPed Si3N4 and the Si-SiC materials ranged from ≈480 MPa to ≈620 MPa. The durability of these materials as engine components is currently being evaluated.
8
Singh, M., and Edgar Lara-Curzio. "Design, Fabrication, and Testing of Ceramic Joints for High Temperature SiC/SiC Composites." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0069.
Full textAbstract:
Various issues associated with the design and mechanical evaluation of joints of ceramic matrix composites are discussed. The specific case of an affordable, robust ceramic joining technology (ARCJoinT) to join silicon carbide (CG-Nicalon™) fiber-reinforced-chemically vapor infiltrated (CVI) silicon carbide matrix composites is addressed. Experimental results are presented for the time and temperature dependence of the shear strength of these joints in air up to 1200°C. From compression testing of double-notched joint specimens with a notch separation of 4 mm, it was found that the apparent shear strength of the joints decreased from 92 MPa at room temperature to 71 MPa at 1200°C. From shear stress-rupture testing in air at 1200°C it was found that the shear strength of the joints decreased rapidly with time from an initial shear strength of 71 MPa to 17.5 MPa after 14.3 hours. The implications of these results in relation to the expected long-term service life of these joints in applications at elevated temperatures are discussed.
9
Choi, Sung R., and John P. Gyekenyesi. "Elevated-Temperature, ‘Ultra’-Fast Fracture Strength of Advanced Ceramics: An Approach to Elevated-Temperature “Inert” Strength." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-479.
Full textAbstract:
The determination of ‘ultra’-fast fracture strengths of five silicon nitride ceramics at elevated temperatures has been made by using constant stress-rate (“dynamic fatigue”) testing with a series of ‘ultra’-fast test rates. The test materials included four monolithic and one SiC whisker-reinforced composite silicon nitrides. Of the five test materials, four silicon nitrides exhibited the elevated-temperature strengths that approached their respective room-temperature strengths at an ‘ultra’-fast test rate of 33 × 104 MPa/s. This implies that slow crack growth responsible for elevated-temperature failure can be eliminated or minimized by using the ‘ultra’-fast test rate. These ongoing experimental results have shed light on laying a theoretical and practical foundation on the concept and definition of elevated-temperature “inert” strength behavior of advanced ceramics.
10
van Roode, Mark, William D. Brentnall, Kenneth O. Smith, Bryan D. Edwards, Leslie J. Faulder, and Paul F. Norton. "Ceramic Stationary Gas Turbine Development Program: Third Annual Summary." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-460.
Full textAbstract:
The goal of the Ceramic Stationary Gas Turbine (CSGT) Development Program, under the sponsorship of the United States Department of Energy (DOE), Office of Industrial Technologies (OIT), is to improve the performance (fuel efficiency, output power, exhaust emissions) of stationary gas turbines in cogeneration through the selective replacement of hot section components with ceramic parts. The program, currently in Phase II focuses on detailed engine and component design, ceramic component fabrication and testing, establishment of a long term materials property data base, the development of supporting nondestructive evaluation (NDE) technologies, and the application of ceramic component life prediction. A 4000 hr engine field test is planned for Phase III of the program. This paper summarizes progress from January 1995 through January 1996. First generation designs of the primary ceramic components (first stage blades and nozzles, combustor liners) for the program engine, the Solar Centaur 50S, and of the secondary metallic components interfacing with the ceramic parts were completed. The fabrication of several components has been completed as well. These components were evaluated in rigs and the Centaur 50S test engine. NTI64 (Norton Advanced Ceramics) and GN-10 (AlliedSignal Ceramic Components) silicon nitride dovetail blades were cold and hot spin tested and engine tested at the baseline nominal turbine rotor inlet temperature (TRIT) of 1010°C. Full scale SiC/SiC continuous fiber-reinforced ceramic matrix composite (CFCC) liners (B.F. Goodrich Aerospace) were also rig tested and engine tested at the nominal baseline TRIT of 1010°C. One of the engine tests, incorporating both the GN-10 blades and the full scale SiC/SiC CFCC liners, was performed for 21.5 hrs (16 hrs at 100% load) with six start/stop cycles. A cumulative 24.5 hrs of engine testing was performed at the end of January, 1996. The ceramic components were in good condition following completion of the testing. Subscale Hexoloy® SA silicon carbide (Carborundum) and enhanced SiC/SiC CFCC (DuPont Lanxide Composites) and Al2O3/Al2O3 CFCC (Babcock & Wilcox) combustor liners were tested to evaluate mechanical attachment, durability and/or emissions reduction potential. The enhanced SiC/SiC CFCC of DuPont Lanxide Composites demonstrated superior durability in subscale combustor testing and this material was subsequently selected for the fabrication of full scale combustor liners for final engine rig testing in Phase II and field testing in Phase III of the program. Enhanced SiC/SiC CFCC liners also showed significantly reduced emissions of NOx and CO when compared with conventionally cooled subscale metallic liners. This observation is believed to apply generally to “hot wall” combustor substrates. The emissions results for the enhanced SiC/SiC CFCC liners were paralleled by similar emissions levels of NOx and CO monitored during engine testing with B.F. Goodrich Aerospace SiC/SiC CFCC combustor liners. NOx levels below 25 ppmv and CO levels below 10 ppmv were measured during the engine testing. Short term (1,000 hrs) creep testing of candidate ceramic materials under approximate nozzle “hot spot” conditions was completed and long term (5000–10,000 hrs) creep testing is in progress. The selected nozzle material, SN-88 silicon nitride, has survived over 5,500 hrs at 1288°C and 186 MPa stress at the end of January, 1996.