Method for improving carbon potential of low-carbon hard alloy
A cemented carbide, carbon potential technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of ineffectiveness, time-consuming, small pits on the surface of the product, etc. Potential homogenization, uniform carbon concentration distribution, and the effect of avoiding product scrap
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[0016] A method for improving the carbon potential of low-carbon hard alloys is to perform gas carburizing treatment on low-carbon hard alloys, and the gas carburizing treatment includes the following steps:
[0017] In the first step, put the low-carbon cemented carbide into the graphite boat and place it in the sintering furnace, raise the temperature from room temperature to 1340-1400°C, and then keep it warm for 30-180 minutes. Access to H 2 with CH 4 The mixed gas, the pulse mode refers to the incoming H 2 with CH 4 The mixed gas is alternately switched between high pressure and low pressure, first high pressure and then low pressure, the high pressure is 200-800mbar, the low pressure is 10-50mbar, the H used in the high pressure stage and the low pressure stage 2 with CH 4 The gas carbon potential of the mixed gas is the same; and, the pulse period is 5-10min, and the time ratio of the high-pressure stage and the low-pressure stage is 2:1 to 4:1;
[0018] The second...
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