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. 13, 1995
Filed:
Oct. 18, 1993
Masashi Yoshimura, Itami, JP;
Takehisa Yamamoto, Itami, JP;
Shinichi Yamagata, Itami, JP;
Jin-Joo Matsui, Itami, JP;
Akira Yamakawa, Itami, JP;
Abstract
Silicon nitride sintered bodies consisting of prismatic crystal grains of Si.sub.3 N.sub.4 and/or sialon, equi-axed crystal grains of Si.sub.3 N.sub.4 and/or sialon, a grain boundary phase existing among the prismatic and equi-axed crystal grains and dispersed particles in the grain boundary phase, in which the prismatic crystal grains have an average grain size of 0.3 .mu.m or less in minor axis and an average grain size of 5 .mu.m or less in major axis, the equi-axed crystal grains have an average grain size of 0.5 .mu.m or less and the dispersed particles have an average size of 0.1 .mu.m or less, the volume of the dispersed particles being 0.05% by volume or more based on the total volume of the rest of the sintered body. The silicon nitride sintered bodies have a strength sufficient for use as structural materials of machine parts or members, with a minimized scattering of the strength as well as high reliability, superior productivity and advantageous production cost.