Gradient cemented carbide and preparation method and application thereof
A cemented carbide, gradient technology, applied to other manufacturing equipment/tools, turbines, engine components, etc., to achieve high hardness and toughness
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[0027] The preparation method of gradient cemented carbide of the present invention comprises the following steps:
[0028] (1) Mix the raw material powders evenly, and add the molding agent to obtain the mixture powder; the raw material powders are: WC powder, Ni 3 Al powder, Ti(C,N) powder, TiC powder, B powder and W powder or graphite powder;
[0029] (2) Compressing the mixture powder at 200-300 MPa to obtain a green compact;
[0030] (3) Put the compact in N 2 Warm up to 1320-1370°C under protection, keep warm for 1-2 hours, and then cool with the furnace to obtain a pre-sintered sample; heat the pre-sintered sample to 1420-1450°C under vacuum, keep it for 1-2 hours, and cool with the furnace to get Gradient carbide.
[0031] The raw material powder is weighed according to the mass percentage of the following elements: C: 5.8-6.1%, Ni: 5.2-10.4%, Al: 0.8-1.6%, Ti: 3-6%, N: 0.1-0.4%, B: 0.04~0.1%, the rest is W. When weighing the raw material powder, use W powder or g...
Embodiment 1
[0039] The preparation method of the gradient cemented carbide of the present embodiment comprises the following steps:
[0040] (1) WC powder, Ni 3 Al powder, Ti(C, N) powder (the quality of N accounts for 30% of the total mass of C and N), TiC powder, B powder and W powder (each raw material powder is batched according to the mass percentage shown in Table 1, after batching The mass percent of each element is: C: 6.1%, Ni: 5.2%, Al: 0.8%, Ti: 3%, N: 0.1%, B: 0.04%, and the rest is W) adding it into a ball mill for ball milling to obtain a mixture, After the ball milling, add paraffin wax with a mass of 1% of the mass of the mixture as a molding agent, and then dry at 90°C for 4 hours to obtain a mixture powder; the ratio of the ball to the total mass of the raw material powder during ball milling is 8:1, The medium is alcohol, the ball milling speed is 220r / min, and the ball milling time is 36h;
[0041] (2) molding the mixture powder under a pressure of 300MPa to obtain a...
Embodiment 2
[0044] The preparation method of the gradient cemented carbide of the present embodiment comprises the following steps:
[0045] (1) WC powder, Ni 3 Al powder, Ti(C, N) powder (the quality of N accounts for 30% of the total mass of C and N), TiC powder, B powder and W powder (each raw material powder is batched according to the mass percentage shown in Table 1, after batching The mass percent of each element is: C: 6.0%, Ni: 6.93%, Al: 1.07%, Ti: 4%, N: 0.2%, B: 0.06%, and the rest is W) adding it into a ball mill for ball milling to obtain a mixture, After the ball milling, add paraffin wax with a mass of 1% of the mass of the mixture as a molding agent, and then dry at 85°C for 6 hours to obtain a mixture powder; the ratio of the ball to the total mass of the raw material powder is 7:1 during ball milling The medium is alcohol, the ball milling speed is 240r / min, and the ball milling time is 32h;
[0046] (2) molding the mixture powder under a pressure of 250MPa to obtain ...
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