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Wax-based binder for compacting process in powder metallurgy as well as preparation method and application thereof

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

Active Publication Date: 2014-03-19
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves upon existing binders used for making metal parts such as plates or pipes. It allows these materials to mix properly without causing problems like crackling during shaping processes due to their high melting point (Tm) values. Additionally, this new type of bond does better resist corrosion from certain chemical substances commonly found on steel tools that are being made into contact therewith. Overall, this innovative technical solution enhance the performance and quality of metal part production methods.

Problems solved by technology

This patents discusses different types of binding agents commonly found use during the process of producing titania hydrides and other materials like zirconia hydroxide. These binding agents play an important role because they help improve the flow ability, disluxion efficiency, surface roughening effectivity, bond strength, and overall dimensions precision of these materials. Additionally, certain existing methods require costly special facilities and involve complicated steps involving multiple stages of heat treatment and purification after finishing. Therefore, this patent seeks to develop new bindings that meet all three main needs simultaneously while being less expensive than current ones.

Method used

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  • Wax-based binder for compacting process in powder metallurgy as well as preparation method and application thereof
  • Wax-based binder for compacting process in powder metallurgy as well as preparation method and application thereof
  • Wax-based binder for compacting process in powder metallurgy as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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 1.86 g / 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 a compacting process in powder metallurgy as well as a preparation method and an application thereof. The binder consists of the following components by mass percent: 60 to 80 percent of solid paraffin, 3 to 10 percent of liquid paraffin, 1 to 10 percent of naphthalene, 2 to 9 percent of polyethylene vinyl acetate, 4 to 15 percent of polyolefin and 1 to 10 percent of stearic acid. The components of the binder are good in compatibility, the rheological property is good, the solvent degreasing rate is high, the retraction property is moderate, the degreasing blank is few in flaws, and the conformality is good; the binder also has the characteristics of cleanliness, low residue, little pollution and the like.

Description

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Claims

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Application Information

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Owner HUNAN UNIV
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