Influence of slurry flocculation on the character and compaction of spray-dried silicon nitride granules
- Asahi Glass Co. Ltd., Yokohama (Japan)
- Nagaoka Univ. of Technology (Japan)
- Nagoya Univ. (Japan)
- Japan Fine Ceramics Center, Nagoya (Japan)
- Tokyo Univ. of Agriculture and Technology (Japan)
The effect of slurry flocculation on the characteristics of silicon nitride granules prepared by the spray drying process is investigated. The flocculation state of an aqueous silicon nitride slurry is controlled by adding nitric acid and evaluated as a function of pH. Dense and hard silicon nitride granules result from a well-dispersed slurry having a high pH (e.g., 10.8). These hard granules retain their shape in green compacts and form detrimental defects. Lowering the pH of the slurry to a certain value (e.g., pH 7.9) results in slurry flocculation. Granules prepared from this flocculated slurry have low density and low diametral compression strength and contribute to the elimination large pores in green compacts.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 82583
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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