Cemented Carbide Special-Shaped Parts Powder Ratio Sintering Program

Tungsten-base alloy has the advantages of high density, high strength and hardness, good thermal conductivity properties, thermal conductivity, low gamma ray absorption ability and high pressure resistance, excellent electrical erosion resistance characteristics of expansion, plays an irreplaceable role in the defense industry, aerospace, electronic information, energy, metallurgy, machinery manufacturing and nuclear industry etc..

The HRC hardness of tungsten based cemented carbide is between 24~32. At present, the market demand the hardness of HRC alloy is greater than or equal to 35. A method of preparing tungsten cobalt nickel alloy with fine grain and high hardness has been put forward by some scholars. This method includes the following steps:

1. Get some tungsten powder, cobalt powder and nickel powder; tungsten powder Fisher particle size is 2.5 μm~ 3.5 μm, cobalt powder Fisher particle size is 1 μm~ 2μm, nickel powder Fisher particle size is 2.6 μm~ 3.6μm.

2. The tungsten powder, cobalt powder and nickel powder are added into the mixing machine to get the mixed powder. The mass percent content of tungsten powder in mixed powder is 85% ~ 98%, the margin cobalt powder, nickel powder quality ratio is 1:1.

3. The cold isostatic pressing machine is used to compact the mixed powder and get the green compact.

4. The green compact was sintered for 30~40min under 1460℃~1640℃, sintered compact was obtained. The sintered compact were annealed for 2h to 5h at temperatures of 1100°C to 1250°C. The fine grain high hardness tungsten cobalt nickel alloy with a grain size of 20μm and a hardness of HRC less than 35 was obtained.

The process is simple and clear. No other trace elements are added to the process. Only by controlling the ratio of cobalt and nickel in the binder, we can prepare tungsten base alloy whose hardness is less than 35 HRC.

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