An enhanced phase gradient distribution infiltration silver-based electrical contact material and its preparation method
A technology of electrical contact materials and gradient distribution, which is applied in the directions of contacts, circuits, electric switches, etc., can solve the problems of increased contact resistance, etc., and achieve the effects of stable temperature rise, convenient operation, and low cost
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Embodiment 1
[0060] Taking the preparation of AgW40 / AgW35 electrical contact materials as an example
[0061] The first step, high-energy ball milling: take silver powder (D90=100nm) 0.5% (wt), W powder (D90=50nm) 10% (wt); W powder (D90=10μm) 84.5%, Ni powder (D90=100nm) 5% (wt), after mixing, the high-energy ball milling speed is 180 rpm, the ball milling time is 6 hours, the ball-to-material ratio is 10:1, and the composite powder prepared as W powder coated with silver and Ni is obtained.
[0062] In the second step, the composite powder obtained in the first step is mixed with silver powder, the total silver content is 50% (D90=100nm silver powder 10%; D90=100μm silver powder 40%); the rotating speed is 150 rpm, and the time is 2 hours .
[0063] In the third step, the mixed powder is sieved at 30 mesh.
[0064] The fourth step is to add silver powder to the sieved powder for wet mixing, and add 0.5% polyethylene glycol colloid; the wet mixing solution medium is acetone, and the rat...
Embodiment 2
[0077] Taking the preparation of AgW75 / AgW60 / Ag45 electrical contact materials as an example
[0078] The first step, high-energy ball milling: get silver powder (D90=100 μm) 5% (wt), W powder (D90=50nm) 94.5% (wt), Co powder (D90=100 μm) 0.5% (wt), carry out high-energy ball milling, The rotation speed was 300 rpm, the ball milling time was 2 hours, and the ball-to-material ratio was 5:1 to obtain a composite powder prepared as W powder coated with silver and Co on the surface.
[0079] In the second step, the composite powder obtained in the first step is mixed with silver powder, the total silver content is 15% (D90=20 μm), the rotating speed is 10 rpm, and the time is 30 hours.
[0080] In the third step, the mixed powder is sieved to 200 mesh.
[0081] The fourth step is to add silver powder to the sieved powder for wet mixing, and add 0.5% polyvinylpyrrolidone colloid; the rotation speed is 300 rpm; the time is 12 hours.
[0082] In this step, the medium used for wet m...
Embodiment 3
[0095] Taking the preparation of AgWC65 / AgWC60 / AgWC55 electrical contact materials as an example
[0096] The first step, high-energy ball milling: take silver powder (D90=100nm) 2% (wt), WC powder (D90=10μm) 93% (wt); additive Co powder (D90=100μm) 0.5% (wt), additive Ni powder (D90=100nm) 4.5% (wt), carries out high-energy ball milling, and rotating speed is 300 rev / mins, and ball milling time is 2 hours, and ball material ratio is 10:1, is prepared into WC powder surface coating silver and Co, Ni Composite powder.
[0097] In the second step, the composite powder obtained in the first step is mixed with silver powder, the total silver content is 30% (D90=100 μm); the rotating speed is 100 rpm, and the time is 15 hours.
[0098]In the third step, the mixed powder is sieved to 100 mesh.
[0099] The fourth step is to add silver powder to the sieved powder for wet mixing, and add 0.5% polyvinylpyrrolidone colloid; the rotation speed is 300 rpm, and the time is 8 hours.
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