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. 28, 2008
Filed:
Dec. 29, 2006
Kiyoshi Hirao, Nagoya, JP;
Shuji Sakaguchi, Nagoya, JP;
Yukihiko Yamauchi, Nagoya, JP;
Shuzo Kanzaki, Nagoya, JP;
Suzuya Yamada, Nagoya, JP;
Kiyoshi Hirao, Nagoya, JP;
Shuji Sakaguchi, Nagoya, JP;
Yukihiko Yamauchi, Nagoya, JP;
Shuzo Kanzaki, Nagoya, JP;
Suzuya Yamada, Nagoya, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Denki Kagku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a BC powder, a TiOpowder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 μm. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrBin BC, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 μm, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 μm to boron carbide particles having a particle diameter of at most 5 μm, is from 0.02 to 0.6.