Influence of Slurry Flocculation on the Character and Compaction of Spray-Dried Silicon Nitride Granules |
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| Authors: | Hideo Takahashi Nobuhiro Shinohara Masataro Okumiya Keizo Uematsu Tsubaki JunIchiro Yuji Iwamoto Hidehiro Kamiya |
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| Affiliation: | Research Center, Asahi Glass Company Ltd., Yokohama, Japan;Nagaoka University of Technology, Nagaoka, Japan;Nagoya University, Nagoya, Japan;Japan Fine Ceramics Center, Nagoya, Japan;Tokyo University of Agriculture and Technology, Tokyo, Japan |
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| Abstract: | 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 of large pores in green compacts. |
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