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Characterization and Processing of CVD Powders for Fabrication of Composite and Compound Ceramics

Published online by Cambridge University Press:  21 February 2011

Saburo Hori ,
Yoshiki Shigaki ,
Yoshihiro Hirata ,
Masahiro Yoshimura  and
Shigeyuki Sōmiya
Saburo Hori
Affiliation:
Kureha Chemical Industry Co., Ltd., 3-25-1 Hyakunincho. Shinjuku-Ku. Tokyo 169, Japan
Yoshiki Shigaki
Affiliation:
Kureha Chemical Industry Co., Ltd., 3-25-1 Hyakunincho. Shinjuku-Ku. Tokyo 169, Japan
Yoshihiro Hirata
Affiliation:
Kagoshima University, 1-21-40 Korimoto. Kagoshima 890, Japan
Masahiro Yoshimura
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology.4259 Nagatsuta, Midori-Ku, Yokohama 227, Japan
Shigeyuki Sōmiya
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology.4259 Nagatsuta, Midori-Ku, Yokohama 227, Japan
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Abstract

Two-component oxide powders were prepared in the systems Al2O3-ZrO2. Al2O3-TiO2. and Al2O3-SiO2 by a CVD (chemical vapor deposition) technique using a combustion flame for the purpose of fabricating respective composite or compound ceramics. The CVD powders were spherical and ultrafine (av. 30–70 nm) with log-normal size distribution, and exhibited either very homogeneous or nanoheterogeneous structure and crystallographic metastability in phases and solid solutions. By starting from these CVD powders, not only uniform and excellent microstructure was achieved in the sintered products, but also better sinterability and novel microstructure became possible owing to the metastability which reflected the formation mechanism of two-component powders at high temperatures. CVD powders, which were previously considered difficult to sinter, proved to be excellent starting materials for fabrication of composite and compound ceramics when improved processing techniques were applied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 155: Symposium L – Processing Science of Advanced Ceramics , 1989 , 3
Copyright
Copyright © Materials Research Society 1989

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References

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