Contact Preparation of Tungsten Copper Contacts (Cu80W / Cu)

1. Selection of raw materials of tungsten copper contacts (Cu80W / Cu)
(1) Selection of tungsten powder. Select tungsten powder with the grade of FW-1 standard, tungsten powder particle size range is: 6-8μm. If the tungsten powder is oxidized, then the reduction of the oxidized tungsten powder is needed at the condition of hydrogen protection, and at a temperature of about 860 ℃, and holding 1h.
(2) Selection of copper powder. Adopting electrolytic copper method to obtain copper, which should be restored firstly, its reducing atmosphere is hydrogen atmosphere, temperature is about 300 ℃, holding time of 1h.

2. Preparation of contact 
Preparation of contact of tungsten copper contacts (Cu80W / Cu) adopts sintering and infiltration process of powder metallurgy.
Process:
Mixing powder (tungsten powder and copper powder, in accordance with an appropriate proportion) → pressing to its shape → sintering and infiltration (tungsten copper blanks) → machining and squeezing.
Sintering and infiltration conditions: the need for introducing hydrogen (hydrogen flow: 1m³ / h), the temperature is about 1500 ℃, sintering time is 2h.
Machining and squeezing: machining the tungsten copper blanks after sintering and infiltration, and then, coating its surface with oil evenly, then squeezing by using four-column hydraulic press machine.



 

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