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Wax-based binder for metal powder injection molding

A metal powder and injection molding technology, which is applied in the field of wax-based binders for metal powder injection molding, can solve the problems of unsuitability for the production of nickel-cobalt-based products, injection defects, and difficulty in compatibility, and achieves low production cost and flowability. Good sex, low impact effect

Active Publication Date: 2015-07-29
SHANDONG JINZHU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under these two interactions, the binder and the powder will not be separated, but due to the inconsistency between the amount of polymer added and the amount of lubricant, there will be a layering effect, which is difficult to dissolve. Such a feed is used injection defect
The BASF company in Germany has also produced a feed material for the catalytic debonding system, which once solved this problem well, but this feed material is not suitable for the production of nickel-cobalt-based products. Therefore, the above problems have been plagued by domestic manufacturers. Metal powder injection molding practitioners

Method used

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  • Wax-based binder for metal powder injection molding

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Embodiment 1

[0019] Binder proportioning (weight ratio) of the present invention: paraffin wax 12%, E wax 34%, polymethyl methacrylate molding powder (PMMA372 molding powder) 5%, ethylene-vinyl acetate copolymer 5%, high density Polyethylene 40%, Stearic Acid 3%, Antioxidant BHT 1%.

[0020] Wax-based feed preparation method: first put the weighed and mixed metal powder into the mixing equipment, then put the weighed paraffin wax, E wax, ethylene-vinyl acetate copolymer, high-density polyethylene, hard acid Put it into the mixing equipment together with the antioxidant BHT, and start the mixing equipment to carry out the mixing operation. After 5 minutes, dissolve the polymethyl methacrylate molding powder in acetone, put the dissolved polymethyl methacrylate molding powder into the mixing equipment, and then carry out the mixing operation until the binder is completely melted. And keep warm for 10min. Enter the discharge operation, granulate after cooling, and the feeding is completed. ...

Embodiment 2

[0032] Binder proportioning (weight ratio) of the present invention: 15% of paraffin wax, 35% of E wax, 6% of polymethyl methacrylate molding powder (PMMA372 molding powder), 6% of ethylene-vinyl acetate copolymer Ethylene 35%, Stearic Acid 2.5% Antioxidant BHT 0.5%.

[0033] Wax-based feed preparation method: with embodiment 1. The mass proportion of the binder accounts for 7.5% of the total mass proportion.

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Abstract

The invention discloses a wax-based binder for metal powder injection molding. The wax-based binder comprises the following components: paraffin, E wax, polymethyl methacrylate moulding powder, an ethylene-vinyl acetate copolymer, high density polyethylene, stearic acid and an antioxidant BHT (butylated hydroxytoluene). The wax-based binder is prepared according to the following steps: putting metal powder into mixing equipment; then putting the paraffin, the E wax, the ethylene-vinyl acetate copolymer, the high density polyethylene, the stearic acid and the antioxidant BHT into the mixing equipment together, starting the mixing equipment and uniformly mixing the materials; dissolving the polymethyl methacrylate moulding powder to acetone to obtain a mixture, then putting the mixture into the mixing equipment, carrying out mixing operation till the binder is completely molten, and carrying out heat preservation for 8-12 minutes; discharging, cooling and then granulating, and feeding to finish the production of the wax-based binder. The binder disclosed by the invention is good in compatibility of components, free of phase separation, and easy to mold and remove, has the advantages of no pollution, no toxicity and the like and is especially applicable to production of Ni-Co-based products formed by metal powder injection molding.

Description

technical field [0001] The invention relates to a wax-based binder for metal powder injection molding, which belongs to the technical field of metal powder injection molding. Background technique [0002] Metal Powder Injection Molding (MIM for short) technology is a product of the interpenetration of plastic injection molding technology, polymer chemistry, powder metallurgy technology and metal materials. Manufacturing high-density, high-precision, high-strength, three-dimensional complex structural parts, especially some small parts with complex shapes that are difficult to process or are processed by mechanical processing, can be easily completed by MIM technology. MIM has the advantages of low cost, high efficiency, good consistency, etc., and is easy to form mass production. It is known as "the most popular component forming technology today". [0003] Around the 1990s, relevant scientific research institutes and colleges and universities in my country successively app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22
Inventor 严远海惠继恒安利平郭恒李永恒
Owner SHANDONG JINZHU MATERIALS TECH
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