| 摘要 |
1,145,387. Electric switch contacts. MALLORY METALLURGIGAL PRODUCTS Ltd. 16 Sept., 1966 [4 Oct., 1965], No. 41416/66. Heading H1N. [Also in Division C7] A sintered material with a minimum electrical conductivity of 95% I.A.C.S. and consisting of 20-70% by weight Cu, 30-80% by weight Ag and a maximum of 10% by weight of a barrier material such as Fe, Ni and Co which prevents diffusion between the Cu and Ag, is made by coating either the Cu or Ag powder, granules or fibres with the barrier material, mixing the powders, pressing the mixture to form a billet which is then either cold extruded or hot extruded at a maximum temperature of 760‹ C. and annealed at 400-700‹ C. Graphite, metal oxides and metal halides may also be added to the powder mixture. The material may be used as electrical contacts, e.g. make and break contacts or sliding contacts. |
