セラミックスパウダープロセシング：粒子構造制御による焼結組織と機能開発

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  • Ceramics Powder Processing: Design of Particle Structure toward Development of Sintered Texture and Functions
  • セラミックスパウダープロセシング : リュウシ コウゾウ セイギョ ニ ヨル ショウケツ ソシキ ト キノウ カイハツ

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<p>Many ceramics are produced by powder processing. Ceramic technologies have been developed on the basis of scientific understanding of powder preparation, molding and sintering. Particle structure is a key factor to predominate the properties of final sintered materials. Although SiC was hardly sinterable, SiC nanopowder significantly enhanced the densification according to the sintering mechanism. The composite particles consisting of multiple components were useful for production of ceramic composites: Si3N4 and SiC-base nanocomposites by vapor phase reaction processes, MoSi2-SiC by carbothermal reduction, Ni-TiC by chemical plating, and Ni-Al2O3 by agglomeration coating, improving the mechanical properties. New sintering technique is another factor to control sintered textures as well as appropriate sintering aids. Spark plasma sintering was effective to produce fine-grained microstructures of SiC and Si3N4 sintered materials. It was notable that translucent Si3N4 ceramics were fabricated using AlN-MgO additive. The translucent Si3N4 ceramics were superior in mechanical and thermal properties to the other oxide translucent materials. Ceramics have various possibilities owing to its diversity in elemental combination and microstructure. The importance is new knowledge and technology to draw their essences and design their functional structures.</p>

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