Additive (Co, Ni and Zr) effect on Ag-WC-C contacts experimental procedure is shown as below:
Experimental Materials:
(1) Silver powder, 51g
(2) A plate-like WC powder, 7.2g, its average length is 2-5um, its length-thickness ratio is 3-5
(3) Graphite powder, 1.44g, its average particle size is 2 ~ 50μm, its density is 2.2 ~ 2.3g / cm³
Experimental procedure:
Sample 1
1. Weigh the above materials and sieve them (100 mesh stainless steel mesh screen), then add WC powder, graphite powder to the blender, mix and stir to get mixing powder;
2. Prepare silver nitrate solution (dissolve silver powder fully in concentrated nitric acid);
3. Pour the silver nitrate solution into the reaction vessel, complex with ammonia until its PH = 10; add the mixing powder to the reaction vessel and stir it, to obtain a composite powder;
4. Keep stirring and pour reductant hydrazine hydrate in a way of liquid spraying through an atomization device into the reaction vessel, until it response adequately;
5. Clean composite powders with distilled water to neutral, dry then (in the dryer, at the temperature below 90 ℃), to obtain dry coating silver (plate- shape grain tungsten carbide, graphite) complex powder;
6. Cold-press the coating composite powder, and then under H2 atmosphere, sintering 3 hours (in the sintering furnace, at a temperature of 840 ℃), and finally re-press at a pressure of 15T / Cm2 for AgWC12C3 contacts .
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