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:
Feb. 28, 1989
Filed:
Jul. 07, 1987
Ryoji Ozaki, Kumagaya, JP;
Hisaji Shinohara, Saitama, JP;
Hironobu Yamamoto, Musashino, JP;
Takashi Nara, Abiko, JP;
Hajime Yoshida, Yokohama, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Tokuriki Honten Co., Ltd., Tokyo, JP;
Abstract
This invention relates to a silver/metal oxide material for electrical contacts containing no Cd which essentially consists of Ag and 5 to 30% by weight of at least one of oxides of Sb, Sn, Zn, In, Cu, Mn, Bi and Pb, and further, if necessary, 0.05 to 2% by weight of at least one of oxides of Mg, Al, Fe, Ni, Co, Si, Ga, Ge, Te, Ca and Li, the total amount of said metal oxides being 5 to 32% by weight, wherein fine particles of said metal oxides are substantially uniformly distributed in a matrix whose main component is Ag in a sintered state, and wherein there are no grain boundaries formed by agglomerations or agglomerated layers of said metal oxides. Further, the method of producing the same is provided including steps of: changing in steps the hydrogen ion concentration in an aqueous solution of Ag ions and at least one of metal ions of Sb, Sn, Zn, In, Cu, Mn, Bi and Pb, and further, if necessary, at least one of metal ions of Mg, Al, Fe, Ni, Co, Si, Ga, Ge, Te, Ca and Li so as to form precipitates of Ag-oxygen compound and oxides and/or hydroxides of said metals; drying and thereafter heat-treating said precipitates to form mixed powder of Ag and oxides of said metals and shaping and sintering said mixed powder; and further, if necessary, heat-treating the sintered material to stabilize.