Electric contact material and its production

Abstract

Abstract PURPOSE:To obtain an electric contact material having low contact resistance and excellent in deposition resistance, by regulating the size of graphite in an alloy prepared by mixing respectively specified amounts of silver powder, borides, and graphite powder to a specific value or below and also by dispersing respective grains uniformly and independently. CONSTITUTION:The electric contact material is composed of an alloy containing, by weight, 97-50% silver powder, 3-50% borides of group IVa, Va, and VIa metals, and 10-0.1% graphite. The size of the graphite grains in the alloy is regulated to <=3mu and respective grains are dispersed uniformly and independently. The above borides are one or >=2 kinds selected from those of W, Ta, Mo, etc. The powders of silver, boride, and graphite are mixed in the above ratio to undergo mechanical alloying, and the resulting perfect powder is compacted and is then sintered in a reducing atmosphere. In this way, the electric contact material reduced in contact resistance and having deposition resistance and arc extinction can be obtained.

Inventors

• 👤 Akira Fukui
• 👤 彰 福井

Bibliographic Details