C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1, 25/133
C04B 35/58 (2006.01) C04B 35/591 (2006.01)
Patent
CA 1142970
ABSTRACT OF THE DISCLOSURE A composite sinter of silicon nitride/boron nitride, which consists essentially of, in weight percentage, silicon nitride within the range of from 60 to 97% and boron nitride within the range of from 3 to 40% and wherein said boron nitride is present as a dispersed phase in the network of said silicon nitride; said composite sinter of silicon nitride/boron nitride being manufactured by the steps of: kneading a silicon powder within the range of from 47.3 to 95.1 wt.% and a boron nitride powder within the range of from 4.9 to 52.7 wt.% as raw materials, with the use cf an organic solvent solution containing a dispersant and a binder; press-forming the resultant kneaded mixture to pre- pare a green compact; sintering said green compact in a non- oxidizing atmosphere at a temperature within the range of from 1,100 to 1,300°C to prepare a sinter having a strength permitting machining; machining said sinter into prescribed dimensions; and sintering again the resultant machined sinter in a nitrogen atmosphere at a temperature within the range of from 1,250 to 1,450°C to nitrify the same, thereby improving strength and thermal shock resistance of said sinter.
370889
Ishikawa Masaru
Ishizawa Kenki
Miyamoto Akira
Nishi Masaaki
Shiranita Akira
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
Shinagawa Shirorenga Kabushiki Kaisha
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