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Application of micro injection molding technique for preparing tungsten-base alloy product and micro injection molding method of tungsten-base alloy powder

A technology of tungsten-based alloy and forming technology, applied in the application of micro-injection molding technology in the preparation of tungsten-based alloy products, in the field of tungsten-based alloy powder micro-injection molding, it can solve the difficulty of MIM forming, many microstructures and micro-sizes, zero The complex structure of components and other problems can reduce pollution, increase bonding force and improve strength.

Inactive Publication Date: 2010-01-13
厦门博兴纳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the structure of the above-mentioned parts is more complex, the geometric shape is more delicate, the microstructure and micro-size are more, and it is difficult to form by MIM.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 94wt% W, 4wt% Cu, and 2wt% Ni were mixed on a planetary ball mill for 1 hour, and the binders were: 44wt% paraffin, 48wt% polyethylene, and 8wt% surface modifier. On the kneader, knead at 160 degrees for 1 hour, then granulate, and then injection molding, the injection pressure is 100 MPa, the mold temperature is 60 degrees, the injection temperature is 140 degrees, and the mold is demoulded when the mold temperature drops to 35 degrees. Degrease in n-heptane solvent for 4 hours, then heat degrease in degreasing furnace, use H 2 Atmosphere, the heating curve is: heating from room temperature to 400 degrees at a rate of 3 degrees per minute, and holding for 1 hour; then heating at a temperature of 2 degrees to 800 degrees, and holding for 2 hours. The sintering is carried out in a vacuum furnace with an inner pressure of 10Pa, the sintering temperature is 1450° C. and the temperature is kept at the sintering temperature for 80 minutes. Finally, miniature 94wt%W, 4wt%Cu,...

Embodiment 2

[0037] 92wt% WC and 8wt% Co were mixed on a planetary ball mill for 2 hours, and the binders were: 46wt% paraffin, 48wt% polyethylene, and 6wt% surface modifier. On the kneader, knead at 160 degrees for 1 hour, then granulate, injection molding (injection pressure 140MPa, mold temperature 60 degrees, injection temperature is 150 degrees), demoulding when the mold temperature drops to 40 degrees. Degrease in n-heptane solvent for 5 hours, then heat degrease in degreasing furnace, use H 2 Atmosphere, the heating curve is: heating from room temperature to 300 degrees at a rate of 3 degrees per minute, and holding for 1 hour; then heating at a temperature of 2 degrees to 800 degrees, and holding for 2 hours. The sintering is carried out in a vacuum furnace with an inner pressure of 1Pa, the sintering temperature is 1450° C. and the temperature is kept at the sintering temperature for 120 minutes. Finally, miniature 92wt% WC, 8wt% Co alloy parts are obtained.

Embodiment 3

[0039] 90wt% WC and 10wt% Co were mixed on a planetary ball mill for 2 hours, and the binders were: 45wt% paraffin, 48wt% polyethylene, and 7wt% surface modifier. On the kneader, knead at 160 degrees for 1 hour, then granulate, injection molding (injection pressure 120MPa, mold temperature 60 degrees, injection temperature is 145 degrees), demoulding when the mold temperature drops to 35 degrees. Degrease in n-heptane solvent for 5 hours, then heat degrease in degreasing furnace, use H 2 Atmosphere, the heating curve is: heating from room temperature to 300 degrees at a rate of 3 degrees per minute, and holding for 1 hour; then heating at a temperature of 2 degrees to 780 degrees, and holding for 2 hours. The sintering is carried out in a vacuum furnace with an inner pressure of 1Pa, the sintering temperature is 1420° C. and the temperature is kept at the sintering temperature for 90 minutes. Finally, miniature 90wt% WC, 10wt% Co alloy parts are obtained.

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PUM

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Abstract

The invention discloses an application of micro injection molding technique for preparing a tungsten-base alloy product, which can prepare a micro tungsten-base alloy part with a mass less than 0.5g and a relative density greater than 96 percent. The invention also discloses a micro injection molding method of tungsten-base alloy powder, comprising steps of mixing, milling mixing, pelletizing, injection molding, green-ware degreasing, sintering and the like. The adhesive consists of wax, polyethylene, surface modifier and the like, wherein the modifier consists of stearic acid and organic naphthaline by a certain proportion, and the viscosity of the adhesive is dramatically reduced at a high shearing rate, thereby being favorable for filling. The invention adopts two degreasing steps of solvent degreasing and heat degreasing, wherein the first step of solvent degreasing can degrease wax of low melting point and partial surface modifier, and the second step of heat degreasing mainly degreases polymer of high melting point. The high-temperature insulation can remove the adhesive, sinter the degreased green body, improve the intensity of the green body and ensure conformality of the green bodies.

Description

technical field [0001] The invention relates to the application of a micro-injection molding technology and a method for producing miniature tungsten-based alloy products, in particular to the application of a micro-injection molding technology in the preparation of tungsten-based alloy products and a method for micro-injection molding of tungsten-based alloy powder. Background technique [0002] With the miniaturization of certain products in various industries, components are also developing in the direction of miniaturization, such as various tiny electronic products, miniature communication equipment, etc. It can be said that micromachines have penetrated into national defense, aerospace, biomedicine, Environmental monitoring, automobiles and many other fields. Micro parts are generally parts with a weight of less than 0.5 grams. Most of the current micro parts are made of iron-based alloys, stainless steel or plastics. However, due to the soft texture and poor wear res...

Claims

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Application Information

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IPC IPC(8): B22F3/115
Inventor 胡业奇龚晓叁易际明葛晓宏周水庭肖平安
Owner 厦门博兴纳新材料科技有限公司
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