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A wax-based binder for powder metallurgy forming and its preparation method and application

A technology of powder metallurgy and binder, applied in the field of binder for powder molding or injection molding, to achieve high solvent degreasing rate, increase degreasing rate, increase solvent degreasing rate and degreasing rate effect

Active Publication Date: 2016-04-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to modify the traditional wax-based binder with the aim of reducing impurity pollution, reducing the amount of binder added, and improving degreasing efficiency in view of the characteristics of high titanium activity and easy dirtying. Wax-based binder for powder metallurgy forming and its preparation method and application, the binder is required to have good component compatibility, good rheological properties, high loading capacity, moderate shrinkage characteristics, high removal efficiency and good resistance to titanium Small pollution and other characteristics

Method used

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  • A wax-based binder for powder metallurgy forming and its preparation method and application
  • A wax-based binder for powder metallurgy forming and its preparation method and application
  • A wax-based binder for powder metallurgy forming and its preparation method and application

Examples

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Effect test

Embodiment 1

[0039] The binder formula is: calculated by mass percentage, 77% paraffin, 5% liquid paraffin, 3% naphthalene, 4% polyethylene vinyl acetate, 5% polypropylene, and 6% stearic acid.

[0040] Preparation method: first heat the kneader, add solid paraffin when the temperature rises to about 100°C, add polyethylene vinyl acetate and polypropylene after the solid paraffin melts, and then continue to heat up to about 165°C, through the continuous stirring of the kneader blades Mix to make polyethylene vinyl acetate and polypropylene melt; then adjust the temperature of the kneader to about 140°C, knead for 20-30 minutes to make it evenly mixed, and finally adjust the temperature of the kneader to about 110°C again, and add all the naphthalene and liquid For paraffin wax, it can be stirred and kneaded by the kneader for 10-15 minutes.

Embodiment 2

[0042] The binder formula is: calculated by mass percentage, 63wt% paraffin, 7wt% liquid paraffin, 8% naphthalene, 3.5wt% polyethylene vinyl acetate, 3.5% polypropylene, 10wt% low-density polyethylene, 5wt% hard Fatty acid. The preparation method is the same as in Example 1.

Embodiment 3

[0045] Example 3 Titanium hydride powder injection molding

[0046] Raw material titanium hydride powder characteristics: D50=10.13μm, bulk density 1.86g / cm 3 , tap density 2.37g / cm 3 , purity>99.1%.

[0047] When using a conventional paraffin-based binder (mass percentage composition: 73% paraffin, 21% high-density polyethylene, 6% stearic acid, comparative example 1) as a binder, the loading of titanium hydride powder is 57vol .%.

[0048] When using binding agent of the present invention (77% paraffin, 5% liquid paraffin, 3% naphthalene, 4% polyethylene vinyl acetate, 5% polypropylene, 6% stearic acid, embodiment 1) as binding agent, The loading of titanium hydride powder reaches 70vol.%. The test results during the solvent degreasing process show that, compared with conventional paraffin-based binders, the degreasing rate of the binder is increased by 20% to 30% under the same process conditions.

[0049] When using the binder of the present invention, the impurity ...

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Abstract

The invention provides a wax-based binder for powder metallurgy forming and its preparation method and application. The quality composition of the binder is: 60% to 80% of solid paraffin, 3% to 10% of liquid paraffin, 1 %~10% naphthalene, 2%~9% polyethylene vinyl acetate, 4%~15% polyolefin, 1%~10% stearic acid. The components of the binder have good compatibility, good rheological properties, high solvent degreasing rate, moderate shrinkage characteristics, less defects in the degreased billet, and good shape retention; the binder also has the characteristics of cleanness, low residue, and little pollution. .

Description

technical field [0001] The invention belongs to the field of binders, and relates to a wax-based binder for powder metallurgy forming and its preparation method and application, and further relates to a powder molding or injection molding whose main body is titanium hydride powder or / and titanium alloy powder. binder. Background technique [0002] Titanium hydride powder or / and titanium alloy powder compression molding or injection molding is one of the hot spots of titanium product manufacturing technology that has attracted much attention at home and abroad in recent years. It can not only manufacture high-quality net-shape or near-net-shape complex parts, but also effectively overcome titanium products. The problems of difficult processing and large processing allowance in manufacturing promote the development of low-cost titanium product production. The binder is the core of titanium hydride powder or / and titanium alloy powder molding or injection molding, and has two b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L91/06C08L23/08C08L23/12C08L23/06C08K5/09B22F3/03B22F3/22
Inventor 肖平安曹杰义张霞李晨坤肖雨桐
Owner HUNAN UNIV
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