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A binder for powder injection molding and its application method

A technology of powder injection molding and application method, which is applied in the direction of adhesives, wax adhesives, non-polymer adhesive additives, etc., can solve the problems of toxic cracking products, environmental hazards, toxicity, etc. The effect of high degreasing efficiency

Active Publication Date: 2016-09-07
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This degreasing process is relatively complicated, and under solvent degreasing, the green body is prone to swelling in the solvent, which affects the quality of the green body
And the solvent is generally selected trichlorethylene or chloropropane, these solvents are usually poisonous
In addition, catalytic degreasing binders have also been proposed at present. However, this kind of binder requires a large investment in equipment, and the binder decomposes under the action of an acidic atmosphere, and the cracked products are also toxic, and the overall damage to the environment is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The binder comprises 5% liquid paraffin, 10% naphthalene, 15% paraffin wax, 20% microcrystalline wax, 10% carnauba wax, 20% polyethylene, 15% polypropylene and 5% stearic acid. The contents of the above components are all in mass fraction.

[0021] The above-mentioned binder is mixed with metal powder (316 powder) to prepare feed, and injected into a green part sample with a thickness of 2 mm. During heat removal, control the temperature in the furnace from room temperature to 600°C at a heating rate of 2.5°C / min. When the temperature is raised at this rate, volume expansion and bubbling will not occur in the green part, and it can be completely removed when the temperature is raised to 600 °C. When the temperature is raised at a rate lower than 2.5°C / min, it can be completely removed when it reaches 600°C, and the slow heating rate can ensure that no bubbles are generated during the thermal removal process, but after a slow heating rate, the entire removal...

Embodiment 2

[0022] Example 2: The binder comprises 5% liquid paraffin, 15% naphthalene, 15% paraffin wax, 12% microcrystalline wax, 15% carnauba wax, 25% polyethylene, 10% polypropylene , 3% stearic acid. The contents of the above components are all in mass fraction.

[0023] The above-mentioned binder is mixed with metal powder (316 powder) to prepare feed, and injected into a green part sample with a thickness of 2 mm. During heat removal, control the temperature in the furnace from room temperature to 600°C at a heating rate of 3.5°C / min. When the temperature is raised at this rate, volume expansion and bubbling will not occur in the green part, and it can be completely removed when the temperature is raised to 600 °C. When the temperature is raised at a rate lower than 3.5°C / min, it can be completely removed when it reaches 600°C, and the slow rate of temperature increase can ensure that no bubbling occurs during the thermal removal process, but after a slow rate of temperature incr...

Embodiment 3

[0024] Example 3: The binder comprises 10% liquid paraffin, 5% naphthalene, 15% paraffin wax, 14% microcrystalline wax, 20% carnauba wax, 15% polyethylene, 20% polypropylene , 1% stearic acid. The contents of the above components are all in mass fraction.

[0025]The above-mentioned binder is mixed with metal powder (316 powder) to prepare feed, and injected into a green part sample with a thickness of 2 mm. During heat removal, control the temperature in the furnace from room temperature to 600°C at a heating rate of 5°C / min. When the temperature is raised at this rate, volume expansion and bubbling will not occur in the green part, and it can be completely removed when the temperature is raised to 600 °C. When the temperature is raised at a rate lower than 5°C / min, it can be completely removed when it reaches 600°C, and the slow heating rate can ensure that no bubbling occurs during the thermal removal process, but after a slow heating rate, the entire removal The process...

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Abstract

The invention discloses an adhesive for powder injection forming and a preparation method thereof. The adhesive comprises the following components in percentage by mass: 5-10% of liquid paraffin, 5-15% of naphthalene, 15-20% of solid paraffin, 10-20% of microcrystalline wax, 15-20% of carnauba wax, 15-30% of first high-molecular polymer, 10-20% of second high-molecular polymer and 1-5% of stearic acid. The first high-molecular polymer and second high-molecular polymer are selected from any two of polyethylene, polypropylene, polyacrylate and acrylonitrile-butadiene-styrene copolymer. The method comprises the following steps: after feeding materials of the adhesive, injecting a green compact, putting in a sintering furnace, and carrying out hot removal on the green compact in the furnace by heating to 600 DEG C at the rate of 2-5 DEG C / minute, thereby completely removing the adhesive; and heating for sintering according to the sintering technique, thereby obtaining the finished product. The adhesive has the advantages of simple and controllable degreasing process and high degreasing efficiency; and the degreasing process can not influence the quality of the green compact, and is clean and environment-friendly.

Description

【Technical field】 [0001] The invention relates to the field of powder injection molding, in particular to a binder for powder injection molding and an application method thereof. 【Background technique】 [0002] Powder injection molding technology is a molding method that injects the mixture of metal or ceramic powder and binder into the mold cavity. It perfectly combines the mature modern polymer injection molding and powder metallurgy technology. It has the advantages of forming complex-shaped workpieces, high dimensional accuracy, no need for machining, and easy to realize high-efficiency automatic production. It is especially suitable for mass production of small mechanical parts with complex shapes, high precision, and high-performance materials. It is an advanced The processing technology of parts and components, especially in recent years, has been widely used in the communication industry and more high-tech industries, and has become a rapidly developing new technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/06C09J123/12C09J133/00C09J155/02C09J191/06C09J11/06B22F1/00C04B35/632
Inventor 朱建军钟孝贤彭毅萍
Owner DONGGUAN HUAJING POWDER METALLURGY
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