Powder processing for fabricating Si{sub 3}N{sub 4} ceramics

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · American Ceramic Society Bulletin

OSTI ID:554099

Kamiya, Hidehiro ^[1]; Naito, Makio; Hotta, Tadashi ^[2]; Isomura, Kenji; Tsubaki, Junichiro ^[3]; Uematsu, Keizo ^[4]

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1. Tokyo Univ. of Agriculture and Technology (Japan)
2. Japan Fine Ceramics Center, Nagoya (Japan)
3. Nagoya Univ. (Japan)
4. Nagaoka Univ. of Technology (Japan)

Usually, the densification of silicon nitride ceramics requires a sintering aid, e.g., alumina and yttria fine powders. Many types of dispersants have been used to obtain a uniform mixture of silicon nitride and sintering aid. These dispersants affect the microstructure and strength of the spray-dried granules. However, few studies have been made of the effects of the microstructure and strength of spray-dried granules. However, few studies have been made of the effects of the microstructure and strength of spray-dried granules on the sintered and mechanical properties of non-oxide ceramics. This article shows the effect of such intergranular porosity--controlled by the strength and structure of spray-dried granules--on the densification of green compacts during sintering. Furthermore, relationships between the fracture strength distribution of spray-dried granules and bending strength distributions of sintered bodies are discussed.

• OSTI ID: 554099
• Journal Information: American Ceramic Society Bulletin, Journal Name: American Ceramic Society Bulletin Journal Issue: 10 Vol. 76; ISSN 0002-7812; ISSN ACSBA7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BULK DENSITY
COMPACTING
CORRELATIONS
EXPERIMENTAL DATA
FABRICATION
FLEXURAL STRENGTH
POWDERS
SILICON NITRIDES
SINTERING
SLURRIES
SPRAY DRYING
YTTRIUM OXIDES