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:
Jun. 17, 2003
Filed:
Mar. 02, 2001
Naoto Hirosaki, Ibaraki, JP;
Toshiyuki Nishimura, Ibaraki, JP;
Yoshinobu Yamamoto, Ibaraki, JP;
Mamoru Mitomo, Ibaraki, JP;
National Institute for Research in Inorganic Materials, Tsukuba, JP;
Abstract
A silicon nitride sintered product comprising silicon nitride grains and a grain boundary phase, wherein the grain boundary phase consists essentially of a single phase of a Lu Si O N crystal phase, and the composition of the silicon nitride sintered product is a composition in or around a triangle ABC having point A: Si N , point B: 28 mol % SiO -72 mol % Lu O and point C: 16 mol % SiO -84 mol % Lu O , as three apexes, in a ternary system phase diagram of a Si N —SiO —Lu O system. Also disclosed is a silicon nitride sintered product comprising silicon nitride grains and a grain boundary phase of an oxynitride, wherein the composition of the sintered product is a composition in a triangle having point A: Si N , point B: 40 mol % SiO -60 mol % Lu O and point C: 60 mol % SiO -40 mol % Lu O , as three apexes, in a ternary system phase diagram of a Si N —SiO —Lu O system.