Back to results
US 4,204,863 AGranted
Sintered contact material of silver and embedded metal oxides
AssigneeSiemens Aktiengesellschaft
InventorHorst Schreiner
Life of this patent
Estimating the term…
Abstract
A sintered contact material of silver and at least two embedded metal oxides for use in electrical contacts in which the metal oxides are distributed alternatingly in the silver in different microscopic zones of the sintered contact material.
Claims11
A sintered contact material of silver and at least two embedded metal oxides made by steps comprising:
- (a) preparing a first composite powder of silver and at least one metal oxide;
- (b) preparing at least one further composite powder of silver, and at least one metal oxide using at least one metal oxide different from the metal oxides in the first composite powder;
- (c) intimately mixing said first composite powder and said at least one further composite powder together;
- (d) pressing the resulting mixture to form a shaped body;
- and
- (e) sintering the shaped body, whereby in the sintered shaped body, at least two of said metal oxides will be distributed in different zones of a mean size between 0.05 and 0.5 mm, and the differrent zones will be uniformly distributed throughout the sintered shaped body.
3 more elements
A method for manufacturing a sintered contact material of silver and at least two embedded oxides comprising:
- (a) preparing a first composite powder of silver and at least one metal oxide;
- (b) preparing at least one further composite powder of silver, and at least one metal oxide using at least one metal oxide different from the metal oxides in the first composite powder;
- (c) intimately mixing said first composite powder and said at least one further composite powder together;
- (d) pressing the resulting mixture to form a shaped body;
- and
- (e) sintering the shaped body, whereby in the sintered shaped body, at least two of said metal oxides will be distributed in different zones of a mean size between 0.005 amd 0.5 mm, and the different zones will be uniformly distributed throughout the sintered shaped body.
3 more elements
Dependencies are inferred from the claim text.