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:
Aug. 13, 2002
Filed:
Nov. 30, 2000
Method for preparing ag-zno electric contact material and electric contact material produced thereby
Tetsuya Nakamura, Kanagawa, JP;
Osamu Sakaguchi, Kanagawa, JP;
Hiroyuki Kusamori, Kanagawa, JP;
Osamu Matsuzawa, Kanagawa, JP;
Masahiro Takahashi, Kanagawa, JP;
Toshiya Yamamoto, Kanagawa, JP;
Tanaka Kikinzoku Kogyo K.K., Tokyo, JP;
Abstract
An object of the present invention is to provide a method of producing an Ag—ZnO electric contact material which can uniformly disperse ZnO micrograms in Ag; which maintains low contact resistance; which exhibits enhanced welding resistance and wear resistance; and which is suitable in view of production costs. The method of producing an Ag—ZnO electrical contact material comprises casting Ag and Zn at predetermined proportions and subjecting the resultant Ag—ZnO alloy to internal oxidation so as to disperse ZnO in Ag, the method being characterized in that an Ag—Zn alloy comprising 5-10 wt. % (as reduced to weight of metal) Zn, the balance being Ag, is formed into chips; the chips are subjected to internal oxidation; the internally oxidized chips are compacted to thereby form billets; the billets are pressed and sintered; and subsequently, the sintered billets are extruded, to thereby yield uniform dispersion, in Ag, of ZnO micrograms.