Binder for micro-powder injection molding and application method thereof
An application method and binder technology, applied in the field of metal powder micro-injection molding, can solve the problems of inability to meet the field of metal powder micro-injection molding, poor dimensional accuracy of sintered products, uneven green density, etc. Mold filling ability, the effect of improving compatibility
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Embodiment 1
[0023] The weight percent of the components according to the mass percent content is: 20 percent of industrial paraffin, 25 percent of Brazilian wax, 24 percent of high-density polyethylene, 15 percent of low-density polyethylene, 13 percent of vegetable oil, and 3 percent of stearic acid. The binder and the raw material powder are prepared in a volume ratio of 54:46.
[0024] 1) Mixing: Put the binder in a blade mixer and mix for 1 hour at 150°C; add metal powder and mix in the mixer for 2 hours at 160°C;
[0025] 2) Injection molding: place the above-mentioned mixture in a plunger-type micro-injection molding machine, and perform injection molding at an injection temperature of 150°C and a mold temperature of 60°C;
[0026] 3) Degreasing: first place the injection-molded blank in dichloromethane to dissolve the paraffin and vegetable oil components; then in an argon atmosphere, heat it to 300°C at a speed of 10°C / min, and then heat it at a speed of 15°C / min Heat to 720°C fo...
Embodiment 2
[0029] The weight percentages of the components according to the mass percentage content are: 15% of industrial paraffin, 30% of Brazilian wax, 15% of high-density polyethylene, 20% of low-density polyethylene, 15% of vegetable oil, and 5% of stearic acid. The binder and the raw material powder are prepared in a volume ratio of 50:50.
[0030] 1) Mixing: Put the binder in a blade mixer and mix for 1 hour at 160°C; add metal powder and mix in the mixer for 2 hours at 170°C;
[0031] 2) Injection molding: place the above-mentioned mixture in a plunger-type micro-injection molding machine, and perform injection molding at an injection temperature of 160°C and a mold temperature of 50°C;
[0032] 3) Degreasing: first place the injection-molded blank in dichloromethane to dissolve the paraffin and vegetable oil components; then in an argon atmosphere, heat it to 300°C at a speed of 10°C / min, and then heat it at a speed of 15°C / min Heat to 720°C for thermal degreasing;
[0033] 4)...
Embodiment 3
[0035] The weight percentages of the components according to the mass percentage content are: 25% of industrial paraffin, 20% of Brazilian wax, 32% of high-density polyethylene, 10% of low-density polyethylene, 15% of vegetable oil, and 5% of stearic acid. The binder and the raw material powder are prepared in a volume ratio of 58:42.
[0036] 1) Mixing: Put the binder in a blade mixer and mix for 1 hour at 160°C; add metal powder and mix in the mixer for 2 hours at 170°C;
[0037] 2) Injection molding: place the above-mentioned mixture in a plunger-type micro-injection molding machine, and perform injection molding at an injection temperature of 170°C and a mold temperature of 70°C;
[0038] 3) Degreasing: first place the injection-molded blank in dichloromethane to dissolve the paraffin and vegetable oil components; then in an argon atmosphere, heat it to 300°C at a speed of 10°C / min, and then heat it at a speed of 15°C / min Heat to 720°C for thermal degreasing;
[0039] 4)...
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