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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.120  No.1400 (April) (2012)  >  pp.123-130

Journal of the Ceramic Society of Japan
<<Previous article Vol.120  No.1400 (April) (2012)   pp.123 - 130 Next article>>

Microstructural control for ultrafine-grained non-oxide structural ceramics

Mikinori HOTTA1)
1) Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

  Ultrafine-grained non-oxide ceramics were prepared by combining the synthesis technology for fine-grained starting powders and the rapid sintering technology for spark plasma sintering (SPS); the two technologies were combined for obtaining ceramics with improved heat and corrosion resistance and improved mechanical properties. Hollow spherical Ca-α SiAlON powders composed of nanosized particles were synthesized by carbothermal reduction–nitridation of a SiO2–Al2O3–CaCO3 powder mixture. Using the Ca-α SiAlON powder, dense Ca-α SiAlON nanoceramics and porous Ca-α SiAlON ceramics with excellent mechanical properties and high heat and corrosion resistance were fabricated by the SPS technique. Ultrafine-grained Si3N4 and SiC ceramics were prepared from fine-grained Si3N4 and SiC powders by SPS. The densification of cubic-BN-dispersed ceramics composites was achieved without the phase transformation of cubic BN to low-hardness hexagonal BN, at a moderate pressure by the SPS technique.


Keyword:
Microstructural control, Ultrafine grain, Powder synthesis, Spark plasma sintering, SiAlON, Silicon nitride, Silicon carbide, Cubic boron nitride

Received: October 28, 2011
Accepted: February 27, 2012 , Published online: March 28, 2012
Copyright (c) 2012 The Ceramic Society of Japan

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