A kind of surface carburized gradient cemented carbide preparation method
A cemented carbide and surface carburizing technology, which is applied in metal processing equipment, metal material coating technology, solid-state diffusion coating, etc., can solve the problems of long carburizing time, low efficiency, and grain growth, and achieve improvement The effect of carburizing efficiency, simple process and small particle size
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example 1
[0018] Example 1: Prepare the surface carburized gradient cemented carbide according to the following steps:
[0019] (1) Preparation of the release agent cemented carbide green body: Weigh various raw material powder ingredients according to weight percentage, among which Co accounts for 8wt%, TiC accounts for 5wt%, TaC accounts for 1wt%, and WC is the balance; the weighed powder Mixed and ball milled for 48 hours, filtered with a 400-mesh screen, dried at 90°C, mixed with butadiene rubber molding agent according to 60% of the weight of the cemented carbide powder, and pressed under a pressure of 320MPa to obtain a cemented carbide green body; cemented carbide raw The blank is kept in a vacuum sintering furnace at 620°C for 2 hours, the heating rate is 2°C / min, and the vacuum degree is 12Pa, forming a cemented carbide green body with a porosity of 28% and the removal of the forming agent;
[0020] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with...
example 2
[0023] Example 2: Prepare the surface carburized gradient cemented carbide according to the following steps:
[0024] (1) Preparation of the release agent cemented carbide green body: Weigh various raw material powder ingredients according to weight percentage, among which Co accounts for 15wt%, and WC is the balance; mix the weighed powder and pass through 72h ball milling, 400 mesh screen Filtrate, dry at 100°C, mix 100% of the weight of the cemented carbide powder into a butadiene rubber molding agent, press and form under a pressure of 380MPa to obtain a cemented carbide green body; keep the cemented carbide green body at 750°C for 3 hours in a vacuum sintering furnace , the heating rate is 4°C / min, the vacuum degree is 15Pa, and the cemented carbide green body with a porosity of 28% and the removal of the molding agent is formed;
[0025] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.8 μm 2 The powder is added to abs...
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