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:
Jul. 28, 1981
Filed:
Sep. 06, 1978
Hiroshi Ito, Dazaifu, JP;
Shigeya Sakaguchi, Fukuoka, JP;
Nippon Tungsten Co., Ltd., Fukuoka, JP;
Abstract
This invention relates to the manufacture of a mechanical seal ring provided with a cemented carbide hardened layer or ring which is firmly bound to a substrate of a mechanical seal ring and is of sufficient hardness. The method is substantially characterized by the use of Ni--P alloy as a binder between the cemented carbide layer and the substrate. In the manufacturing process, after a presintered carbide compact made of hard carbide powder such as tungsten carbide powder is applied to a groove of the substrate, the Ni--P alloy in either paste form or compacted and sintered compact form is applied onto the presintered carbide compact and finally is sintered in a non-oxidizing furnace. In the above sintering process, Ni and P infiltrates and diffuses into the substrate and the presintered carbide compact whereby the cemented carbide hardened layer and the substrate can be firmly bound to each other due to the metallurgical bonding therebetween.