The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1983
Filed:
Feb. 11, 1981
Akira Miyamoto, Tokyo, JP;
Masaru Ishikawa, Fukuyama, JP;
Masaaki Nishi, Fukuyama, JP;
Kenki Ishizawa, Bizen, JP;
Akira Shiranita, Bizen, JP;
Nippon Kokan Kabushiki Kaisha, Tokyo, JP;
Shinagawa Shiroenga Kabushiki Kaisha, Tokyo, JP;
Abstract
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.