Development of novel ceramic processing

Biswas, D.R.

doi:10.1007/bf02385772

Cited by 13 publications

(4 citation statements)

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“…Early accounts of research opportunities for materials processing in space have been provided by the National Research Council (1978) of the USA (see also Elwell, 1978 ;Biswas, 1989 ). Hence, it is desirable to prepare powders with a spherical shape and a uniformly small size that will possess superior space -fi lling properties.…”

Section: Powder Preparation Under Reduced Gravitymentioning

confidence: 99%

Advanced Ceramic Processing and Future Development Trends

Heimann

2010

Classic and Advanced Ceramics

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Many of the current limitations to the performance of ceramics in high -technology areas are a direct consequence of non -optimum physico -chemical properties of the powders used in their fabrication. The average particle size, particle size distribution, degree of agglomeration, and dispersion characteristics of the precursor powders combine to limit the macroscopic homogeneity of the ceramics in the green and fi nal sintered states. The microstructural homogeneity of the ceramics can be optimized by processing powders with tightly controlled characteristics. Monodisperse metal oxide powders derived from sol -gel processes are prime examples of these materials. Such powders offer many processing advantages over conventional ceramic powders, since their spherical shape and narrow particle size distribution allow for a tight control over the packing density of the powder particles in the green ceramic. Since there are very few agglomerates, the particles pack very uniformly, with residual pore sizes in the green ceramic often being on the order of just two particle diameters -that is, less than 1 µ m. While dispersions of those powders settle only slowly, very high green densities are attainable due to statistical ordering of the particles with residual pore size that often are on the order of one particle diameter. This is a crucial advantage, since residual porosity or agglomerates in a fi red structural ceramic will act as crack initiation sites or create defects in the material, hence lowering its overall performance and strength. In processing conventional ceramic powders, it is very diffi cult to eliminate any residual porosity and fl aws that might result from poor powder packing and the presence of agglomerates. Densifi cation is typically accomplished by applying pressure and/or adding sintering aids to control grain growth (see Chapter 2 ). Processing by hot isostatic pressing ( " HIPing " ) is extremely costly and therefore undesirable, and is also limited to simple geometric shapes. The addition of sintering aids can adversely affect the hightemperature properties of the material by lowering the melting point, and therefore is also undesirable. With monosized powders, such processing steps are not necessary to achieve good densities, microstructural uniformity, and superior sinterability.

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Section: Powder Preparation Under Reduced Gravitymentioning

confidence: 99%

Advanced Ceramic Processing and Future Development Trends

Heimann

2010

Classic and Advanced Ceramics

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“…Generally, ceramics can be defined as a kind of hardened material, which are made by shaping and then firing at a high temperature in a furnace, using inorganic-nonmetallic powders as raw materials [29][30]. The fabrication process of ceramics is shown in Conventionally, most ceramics are opaque or translucent because they are laden with internal flaws that act as scattering centers in the body shown in Fig.…”

Section: Chapter 2 Yag Transparent Laser Ceramics 21 Transparent Cermentioning

confidence: 99%

“…29 shows SEM images of the YAG powders by modified co-precipitation calcined at different temperatures. The crystallites inFig.…”

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confidence: 99%

Nano-crystalline ceramic laser materials and lasers

Gong¹

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This work could not have been completed without the generous help from several people. First, I would like to express my sincere gratitude and respect to my supervisor, A/P Tang Dingyuan and my co-supervisor Prof. Ma Jan, for their patience, valuable guidance and strong support for my project. Their suggestion and full support constitute the crucial factor of the progress of this project. I would like most sincerely to thank them for all that they have done for me, and for what I have learned from them. I am especially grateful for their consistent efforts in maintaining a highly flexible situation for research.

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“…Dentre a classe de materiais disponíveis, os materiais cerâmicos destacam-se por suas propriedades particulares, como elevada temperatura de fusão, resistência a corrosão e ao desgaste [53] . Na tecnologia de queimadores de gás para aquecimento, os materiais cerâmicos geralmente são os denominados refratários como: alumina (Al 2 O 3 ) [54][55][56] , carbeto de silício (SiC) [57][58][59] e zircônia estabilizada com os seguintes aditivos: ítria-magnésia (PSZ) [60][61][62] , ítria-alumina (YZA) [63,64] , mulita (ZTM) [65] e alumina (ZTA) [66] .…”

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Desenvolvimento de queimadores para iluminação a gás à base de silicato de terras raras

Santos¹

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AGRADECIMENTOSEm primeiro lugar gostaria de agradecer a Deus pela sabedoria e saúde para o desenvolvimento deste trabalho. A São Jerônimo pela orientação, força e discernimento na elaboração desta tese. A minha orientadora Dra. Sonia R.H.M. Castanho pela oportunidade de realizar este doutorado, orientação, confiança e consideração durante toda esta minha caminhada. A Dra. Chieko Yamagata pelo comprometimento, paciência e apoio durante todo o desenvolvimento desta tese. A Dra. Emília S. M. Seo pelo respeito e atenção durante todo trabalho.

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Development of novel ceramic processing

Abstract: Ceramic materials processing consists of powder preparation and fabrication of components by using these powders. Conventional powder preparation and fabrication of ceramic components along with novel methods are reviewed.

Cited by 13 publications

References 48 publications

Advanced Ceramic Processing and Future Development Trends

Advanced Ceramic Processing and Future Development Trends

Nano-crystalline ceramic laser materials and lasers

Desenvolvimento de queimadores para iluminação a gás à base de silicato de terras raras

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