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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.112  No.1301 (January) (2004)  >  pp.35-39

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
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Effect of Coarser Grains in Raw Powder on Inhomogeneous Structure in AlN Sintered Body

Hirohiko NAKATA1), Junichi TATAMI2), Masahiro NAMIKI2), Katsutoshi KOMEYA2), Takeshi MEGURO2), Akira KUIBIRA1), Makio NAITO3) and Tadashi HOTTA4)
1) Itami Research Labs., Sumitomo Electric Industry Co., Ltd.
2) Graduate School of Environment and Information Sciences, Yokohama National University
3) Joining and Welding Research Institute, Osaka University
4) Japan Fine Ceramics Center

  The effect of coarser grains in AlN raw material on the inhomogeneous structure in AlN sintered body was investigated. It was confirmed that the fine and homogeneous AlN raw material showed higher densification rate at lower temperature, namely, a high sinterability. On the other hand, the addition of coarser grains to the fine and homogenous raw material restricted densification to bring about lower density. As a result of measurement of local porosity and pore size distribution, it was observed that large pores were unevenly distributed near coarser grains. The reason why large pores were left near coarser grains seems to be that not only the coarser grain disturbed shrinkage but also that oxygen, essential for densification of AlN, was insufficient near the coarser grains.

Aluminum nitride, Liquid phase sintering, Coarser grains, Local porosity, Pore size distribution

Received: August 06, 2003
Accepted: November 27, 2003 , Published online: January 23, 2004
Copyright (c) 2004 The Ceramic Society of Japan



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