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Titanium alloy powder injection molding special material and preparation method thereof

A powder injection molding and injection molding technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high gap content, high cost, oxygen absorption, etc., and achieve the effect of low reactivity, less oxygen absorption, and cost reduction.

Active Publication Date: 2017-08-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some technical problems in the preparation of titanium alloy parts, such as the high cost of fine powder raw materials used to prepare titanium alloy parts; titanium and titanium alloys have very high reactivity at higher temperatures, and are easy to combine with thermal degreasing and sintering The decomposition products of the binder react during this period, so that a part of the titanium or titanium alloy is equivalently eroded away, resulting in a high void content; powders with a particle size below 45 μm are usually used in injection molding in order to produce minimal porosity within the sample The ratio and the density close to the theoretical value are used to improve the mechanical properties, but the smaller the particle size of the titanium alloy powder, the higher the surface area, and the more prone to pollution and oxygen absorption of titanium and titanium alloys during processing, degreasing and sintering; in addition, the use of fine powder Powders can cause more shrinkage because the smaller the particles used, the higher the sintering rate and the denser the sintering

Method used

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  • Titanium alloy powder injection molding special material and preparation method thereof
  • Titanium alloy powder injection molding special material and preparation method thereof
  • Titanium alloy powder injection molding special material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Place coarse titanium alloy powder particles with a particle size of 60 μm in an aqueous solution of branched polyethyleneimine (Mw=10000) with a concentration of 2 g / L for adsorption for 30 minutes. The mass ratio of the particles to the aqueous solution is 1:4, and then use Wash the coarse titanium alloy powder particles with ion water for 10 minutes, then add 0.5 g / L negatively charged poly-p-styrene sodium sulfonate (Mw=10000) aqueous solution for adsorption for 30 minutes, the mass ratio of particles to aqueous solution is 1:4, Then wash with deionized water for 10 minutes, and then add 1 g / L positively charged TiO 2 (particle size 20nm) was adsorbed in the dispersion for 30 minutes, the mass ratio of the particles to the water dispersion was 1:4, and finally washed with deionized water for 10 minutes, and the above process was used to alternately deposit poly(p-styrene sodium sulfonate) and TiO 3 times 2 , so that the surface of the coarse titanium alloy powde...

Embodiment 2

[0036] (1) Place the coarse titanium alloy powder with a particle size of 65 μm in an aqueous solution of branched polyethyleneimine (Mw=40000) with a concentration of 3 g / L for adsorption for 30 minutes, the mass ratio of the particles to the aqueous solution is 1:4, and then deionized Wash the coarse titanium alloy powder particles with water for 10 minutes, then add 1.03 g / L negatively charged sodium hydroxymethyl cellulose (Mw=16000) aqueous solution for adsorption for 30 minutes, the mass ratio of the particles to the aqueous solution is 1:4, and then Wash with deionized water for 10 minutes, then add 2 g / L positively charged TiO 2 (particle size 30nm) was adsorbed in the dispersion for 30 minutes, the mass ratio of the particles to the aqueous dispersion was 1:4, and finally washed with deionized water for 10 minutes, and the above process was used to alternately deposit sodium hydroxymethyl cellulose and TiO 8 times 2 , so that the surface of the coarse titanium alloy p...

Embodiment 3

[0041] (1) Put the coarse titanium alloy powder with a particle size of 70 μm in an aqueous solution of branched polyethyleneimine (Mw=60000) with a concentration of 4 g / L for adsorption for 30 minutes. The mass ratio of particles to aqueous solution is 1:4, and then deionized Wash the coarse titanium alloy powder particles with water for 10 minutes, then add 1.5g / L negatively charged polyacrylic acid (Mw=70000) aqueous solution for adsorption for 30 minutes, the mass ratio of particles to aqueous solution is 1:4, and then deionized water Wash with water for 10 minutes, then add 3g / L positively charged TiO 2 (particle size 40nm) in the dispersion for 30 minutes, the mass ratio of the particles to the water dispersion was 1:4, and finally washed with deionized water for 10 minutes, using the above process for a total of 11 alternate depositions of polyacrylic acid and TiO 2 , so that the surface of the coarse titanium alloy powder particles adsorbs the polyelectrolyte / titanium ...

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Abstract

The invention belongs to the field of polymer binder materials and powder metallurgy, and particularly relates to a titanium alloy powder injection molding special material and a preparation method thereof. Only surface modification of coarse titanium or titanium alloy powder is required, a simple layer-by-layer self-assembling technology is adopted, titanium dioxide particles and a polyelectrolyte are led into the surfaces of existing coarse titanium or titanium alloy powder particles, and accordingly coarse titanium or titanium alloy powder particles of a core-shell structure can be obtained by means of preparation; and then a titanium alloy product which is low in cost, shrinking percentage and sintering density and is of a porous structure can be prepared by mixing with a polymer binder, powder injection molding, catalytic debinding and vacuum sintering.

Description

technical field [0001] The invention belongs to the field of polymer binder materials and powder metallurgy, and in particular relates to a special material for titanium alloy powder injection molding and a preparation method thereof. Background technique [0002] Metal Injection Molding (MIM) is a production technique for the mass production of miniature metal parts with complex shapes. The research on modern MIM technology began in the early 1970s, and in the mid-1980s, due to the reduction in raw material production costs and the continuous research and improvement of binder design theory and degreasing theory, MIM technology has developed rapidly and has become the most popular attention today. Type processing technology, widely used in aerospace, automobile, computer, instrumentation and other industries. The research and application of MIM technology in my country started relatively late, starting from the late 1980s, and achieved a series of research results. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22B22F3/10
CPCB22F3/1021B22F3/225B22F1/102B22F1/103
Inventor 甘国民杨志成曹峥张钱鹏方磊孙何莲蒋钱良刘春林吴盾史安康
Owner CHANGZHOU UNIV
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