Nippon Kokan Kabushiki Kaisha

Shinagawa Shirorenga Kabushiki Kaisha

Osaka Oxygen Industries, Ltd.

Shinagawa Shiroenga Kabushiki Kaisha

Kenki Ishizawa

Yutaka Tsuchida

Masaru Ishikawa

Akira Miyamoto

Yutaka Nakano

Masaaki Nishi

Naoaki Sasaki

Mikio Mugita

Hiroshi Kuroshima

Akira Shiranita

Sensor for measuring density of oxygen in molten metal

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 of an organic solvent solution containing a dispersant and a binder; press-forming the resultant kneaded mixture to prepare a green compact; sintering said green compact in a non-oxidizing atmosphere at a temperature within the range of from 1,100.degree. to 1,300.degree. 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.degree. to 1,450.degree. C. to nitrify the same, thereby improving strength and thermal shock resistance of said sinter.

Composite sinter of silicon nitride/boron nitride and method for

Growing community of inventors

Bizen, Japan

Kenki Ishizawa