Cemented Carbide Special-Shaped Powder Proportioning Sintering Program

In general, the HRC hardness of tungsten based cemented carbide is between 24~32, and at present the market needs tungsten based alloy products with high hardness special-shaped parts or plates, the hardness of HRC alloy for more than 35, now can only rely on the forging deformation treatment the hardness, but the complexity of the production process, equipment investment, the production cost is high, the profit is very low, the lack of market competitiveness;

The hardness of HRC alloy for more than 35, now can only rely on the forging deformation treatment the hardness, but the complexity of the production process, equipment investment, the production cost is high, the profit is very low, the lack of market competitiveness; At the same time, some products are limited by small size or complex shape. It is not suitable to use deformation strengthening to improve the hardness.

In view of the shortcomings of the above methods, some scholars have proposed a preparation method of fine grain high hardness tungsten cobalt nickel alloy. By selecting tungsten as the alloy matrix and using cobalt and nickel as the binder, and by controlling the ratio of cobalt to nickel, the fine-grained high hardness tungsten based alloy with a grain size of not more than 20 m and a hardness of HRC less than 35 is finally prepared.

1. Weighed tungsten powder, cobalt powder and nickel powder; tungsten powder Fischer-Tropsch particle size of 2.5um ~ 3.5um, cobalt powder Fischer-Tropsch particle size of 1um ~ 2um, nickel powder Fischer-Tropsch particle size of 2.6um ~ 3.6um.

2.The so-called tungsten powder, cobalt powder and nickel powder added to the mixer to obtain a mixed powder. The mass percent content of the tungsten powder in the mixed powder is 85% -98%, the balance is cobalt powder and nickel powder, and the mass ratio of the cobalt powder and the nickel powder is 1: 1.

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

4.Blank at the temperature of 1460 ℃ to 1640 ℃ under the condition of sintering 30min ~ 60min sintered billet, then sintered at the temperature of 1100 to 1250 ℃ under the vacuum annealing of 2h ~ 5h, the grain size of not more than 20 m, the HRC hardness of not less than 35 of fine grain high hardness tungsten cobalt nickel alloy.

Compared with the prior art, the tungsten powder, nickel powder and cobalt powder ratio, compacts after sintering, the process is simple, the process does not need to add other trace elements, not only control the deformation strengthening treatment, the proportion of binder cobalt and nickel, tungsten alloy can be prepared HRC hardness of not less than 35.

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