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:
Mar. 07, 1989
Filed:
Nov. 06, 1987
Applicant:
Inventors:
Naoto Hirosaki, Yokohama, JP;
Akira Okada, Yokohama, JP;
Assignee:
Nissan Motor Co., Ltd., Yokohama, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501 97 ; 501 98 ; 501152 ; 264 65 ;
Abstract
A silicon nitride base sintered body having high strength at normal and high temperatures is obtained by a nitrogen gas atmosphere pressure sintering method using a combination of Y.sub.2 O.sub.3 and Nd.sub.2 O.sub.3 and/or Sm.sub.2 O.sub.3 as a sintering aid. The molar ratio of Y.sub.2 O.sub.3 to Nd.sub.2 O.sub.3 and/or Sm.sub.2 O.sub.3 is from 9:1 to 1:9. The pressure of the nitrogen gas atmosphere is not lower than 1 atm and is lower than 500 atm. The sintering temperature is 1750.degree.-2200.degree. C.