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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

Inactive Publication Date: 2011-12-28
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the green strength of this binder system is low, and due to the phase transition of PW from the injection temperature to room temperature, the volume shrinkage will be large, resulting in uneven density of the green body, high rejection rate, and poor dimensional accuracy of the sintered product, which cannot meet the requirements. Metal powder micro injection molding field
At present, the binder in this area mainly depends on imports, and the cost is very high

Method used

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  • Binder for micro-powder injection molding and application method thereof
  • Binder for micro-powder injection molding and application method thereof
  • Binder for micro-powder injection molding and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses binder for micro-powder injection molding and an application method thereof. The binder comprises the following components by mass percentage: 15% to 25% of industrial paraffin, 20% to 30% of Brazilian wax, 15% to 32% of high-density polyethylene, 10% to 20% of low-density polyethylene, 5% to 20% of vegetable oil and 1% to 7% of stearic acid. The application method of the binder comprises the following steps: mixing the binder and metal powder by a volume ratio of (50-58):(50-42); injection molding; de-fatting; and sintering to obtain a micro-metal part. The binder of the invention has lower viscosity but enough strength, and the binder has better injection molding capacity and green-pressing stability; the binder, due to the flowability, facilitates the micro-injection molding process and avoids the damage caused by demolding green bodies; the density of injection-molded green bodies is uniform; and the de-bound micro-metal parts resistant to cracks and deformation can be produced through the thermal de-binding process at low temperature and at a low heating rate.

Description

technical field [0001] The invention relates to a binder specially used for powder micro-injection molding in the field of metal powder micro-injection molding and an application method thereof. Background technique [0002] Metal powder micro-injection molding (uMIM) is a new forming technology developed on the basis of metal powder injection molding. The size of injection-molded products is generally submillimeter or even micron, and the weight is generally below 2 grams. The minimum can reach 0.02 grams. At present, the production of metal micro-scale injection molding has the disadvantages of high scrap rate, easy deformation, and unstable dimensional accuracy, which seriously restricts the industrial scale and application range of metal micro-scale injection molding technology. An important reason for this situation It's a problem with the existing binder. The existing binder formulations of wax-based systems commonly used in China are mainly used for metal injection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/115
Inventor 夏卿坤刘煜肖燕芳张昊何浩
Owner CHANGSHA UNIVERSITY
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