Influence of granule character and compaction on the mechanical properties of sintered silicon nitride

Journal Article · Sun Mar 31 23:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08515.x· OSTI ID:247903

Takahashi, Hideo; Shinohara, Nobuhiro ^[1]; Uematsu, Keizo ^[2]; JunIchiro, Tsubaki ^[3]

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1. Asahi Glass Co., Ltd., Yokohama (Japan)
2. Nagaoka Univ. of Technology (Japan)
3. Nagoya Univ. (Japan)

The influence of granule character and compaction on the mechanical properties of sintered silicon nitride was studied as a function of the pH of the spray-dry slurry. The character and the compaction behavior of the spray-dried silicon nitride granules considerably affect the mechanical properties of the sintered body. Dense and hard granules resulting from a well-dispersed slurry retained their shape in green compacts and caused numerous pore defects in sintered body. Decreasing the slurry pH to a certain value (e.g., 7.9) caused slurry flocculation and reduced the granule density as well as the diametral compression strength of the granules. Sintered bodies fabricated with these weak granules contained fewer defects and showed remarkable strength increase.

• Sponsoring Organization: USDOE
• OSTI ID: 247903
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BULK DENSITY
COMPACTING
COMPRESSION STRENGTH
FLEXURAL STRENGTH
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
NITRIC ACID
PH VALUE
POROSITY
POWDERS
SCANNING ELECTRON MICROSCOPY
SILICON NITRIDES
SINTERING
SLURRIES
SPRAY DRYING
YTTRIUM OXIDES