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:
Sep. 13, 1988
Filed:
May. 22, 1986
Koichi Yamada, Niihama, JP;
Masahide Mouri, Niihama, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A method for producing wear-resistant sintered silicon carbide products as provided herein in which 90 to 50 wt. % of .beta.-SiC having an average particle diameter of not more than one micron is mixed with 10 to 50 wt. % of .alpha.-SiC having an average particle size which is not more than one micron but not less than 1.15 times as large as that of the .beta.-SiC, and wherein tar pitch and a boron compound are added as densification aids to the powdery SiC mixture; the amount of the tar pitch being present in an amount necessary to provide the total carbon content of the powdery SiC mixture, and in a range of 4 wt. % to less than 8 wt. %; and wherein the boron compound is present in an amount of 0.03 wt. % to less than 0.15 wt. % as boron, based upon the powdery SiC mixture and wherein the resulting mixture is molded and sintered at a temperature of from 2050.degree. to 2300.degree. C. in an inert atmosphere. The molded products are superior in mechanical strength and wear resistance as opposed to conventional sintered silicon carbide products.