Preparation method of rapid composite of long silver-graphite electrical contact material and solder strip material

A preparation method of a rapid composite of a long silver-graphite electrical contact material and a solder strip material, comprising the following steps:

• first step, making a silver-graphite spindle into a silver-graphite electrical contact sheet material by an extrusion process;
• second step, performing a sintering to composite a solder strip material with the silver-graphite electrical contact sheet material to obtain a composite blank;
• and
• third step, performing a rolling and a heat treatment on the composite blank for one or more times to complete the rapid composite of the long silver-graphite electrical contact material and the solder strip material;
• wherein in the first step, the extrusion process is a hot extrusion, a sintering temperature of the silver-graphite spindle is 600° C.-800° C., and a sintering time is 1-5 h;
• wherein in the first step, the silver-graphite electrical contact sheet material has a U-shaped structure with a stuck slot, and the stuck slot makes the long silver-graphite sheet material stuck with the solder strip material, so that surfaces of the long silver-graphite sheet material and the solder strip material contact with each other closely;
• and during the sintering in the second step, the solder strip material covers the stuck slot to form a good solder layer;
• wherein in the second step, a temperature of the sintering is 600° C.-800° C., and a protective atmosphere for the sintering is hydrogen:
• wherein in the third step, the rolling is a cold rolling, so that the silver-graphite sheet material and the solder strip material are bonded densely after being composited, and the composite silver-graphite is rolled to a desired thickness of a finished product:
• wherein the heat treatment is a diffusion annealing;
• a temperature of the diffusion annealing is 400° C.-600° C., and a time of the diffusion annealing is 0.5-3 h.