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A binder for titanium hydride powder injection molding

A technology of powder injection molding and titanium hydride, which is applied in metal processing equipment, transportation and packaging, etc. It can solve the problems of long degreasing time, low density and strength of degreasing billet, and many defects of degreasing billet, and achieve high dimensional accuracy and High performance such as surface precision, density and strength, and the effect of improving microstructure and mechanical properties

Active Publication Date: 2019-04-16
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, traditional binders in TiH 2 There are obvious deficiencies in powder injection molding: 1. The compatibility of the binder is poor, the resulting feed material has poor processing fluidity in injection molding, and there are defects such as bubbles and flashes during the injection process
2. The solvent degreasing rate is low, the degreasing time is long, and the temperature is high, usually at 60 ° C ~ 80 ° C, degreasing 10 ~ 24 hours, the degreasing billet has many defects and poor shape retention
3. Although part of the binder has a high degreasing rate, because of its high degreasing rate, the degreasing base obtained after injection molding and degreasing in use has the defects of large pores and high porosity, resulting in the density of the degreasing base. Low performance such as strength and strength, which leads to poor performance of the final product
4. In the process of injection molding, it is easy to cause the grain to grow, and the sintered billet after vacuum sintering is often deformed, and the surface is not smooth, with bubbling, and its dimensional accuracy and surface accuracy are not high, resulting in the density of the final product. Many performance needs to be further improved

Method used

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  • A binder for titanium hydride powder injection molding
  • A binder for titanium hydride powder injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A binder for titanium hydride powder injection molding, which consists of solid paraffin (PW), liquid paraffin (LPW), polypropylene (PP), rare earth (Re), stearic acid (SA) and ethylene-vinyl acetate Ester copolymer (EVA), these raw materials all adopt conventional commercially available products, wherein, solid paraffin is the sliced ​​paraffin produced by Shanghai Hualing Rehabilitation Machinery Factory, and it is made by high-purity paraffin and microcrystalline wax; Liquid paraffin is Chengdu Produced by Kelong Chemical Reagent Factory, polypropylene is the premium grade produced by China Petrochemical Co., Ltd., rare earth is produced by Guangzhou Wengjiang Reagent Co., Ltd., stearic acid is produced by Chengdu Kelong Chemical Reagent Factory, the content is greater than 99.0%, EVA is produced by DuPont in the United States, and the mass content of vinyl acetate is 20%; among them, the mass percentages of each component are PW 35%, LPW 15%, PP 40%, Re 2%, SA 6%, EV...

Embodiment 2

[0022] A binder for titanium hydride powder injection molding, which consists of solid paraffin (PW), liquid paraffin (LPW), polypropylene (PP), rare earth (Re), stearic acid (SA) and ethylene-vinyl acetate Ester copolymer (EVA) composition, wherein, the mass content of the vinyl acetate in EVA is 20%; Wherein, the mass percentage content of each component is respectively PW 40%, LPW 15%, PP 38%, Re 4%, SA 2%, EVA1%; rare earth by CeH 2 、LaH 2 and CeB 6 They are respectively composed in proportions of 3%, 0.85% and 0.15% of the total mass of the binder.

[0023] When applying the binder in this example, in the process of preparing the feeding material for titanium hydride powder injection molding, according to the ratio of 10%:90% by mass, the components of the prepared binder were weighed respectively, and the average particle size was 9~11μm titanium hydride powder, then mix the titanium hydride powder and binder evenly, put it into the preheated internal mixer at 180℃~19...

Embodiment 3

[0027] A binder for titanium hydride powder injection molding, which consists of solid paraffin (PW), liquid paraffin (LPW), polypropylene (PP), rare earth (Re), stearic acid (SA) and ethylene-vinyl acetate Ester copolymer (EVA) composition, wherein, the mass content of the vinyl acetate in EVA is 20%; Wherein, the mass percentage content of each component is respectively PW 33%, LPW 12%, PP 35%, Re 5%, SA 10%, EVA5%; rare earth by CeH 2 , NdH 2 , YH 2 and LaB 6 、NdB 2 They are respectively composed in proportions of 1.3%, 2%, 1.55%, 0.05%, and 0.10% of the total mass of the binder.

[0028] When applying the binder in this example, in the process of preparing the feeding material for titanium hydride powder injection molding, according to the ratio of 13% by mass: 87%, the components of the prepared binder were weighed respectively, and the average particle size was 9~11μm titanium hydride powder, then mix the titanium hydride powder and binder evenly, put it into the pr...

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Abstract

The invention relates to a binder for titanium hydride powder injection molding. It is composed of solid paraffin, liquid paraffin, polypropylene, rare earth, stearic acid and ethylene-vinyl acetate copolymer; wherein, the mass percentages of each component are respectively 30% to 50% of solid paraffin, 10% of liquid paraffin LPW %~20%, polypropylene 35%~40%, rare earth 1%~5%, stearic acid 2%~10%, and ethylene-vinyl acetate copolymer 1%~5%. The binder used for titanium hydride powder injection molding in the present invention has good compatibility of components, high solvent degreasing rate in the injection molding process, and the obtained degreased base has small pore size, low porosity and few defects , Good shape retention and other advantages.

Description

technical field [0001] The invention relates to the technical field of metal injection molding, in particular to a binder for titanium hydride powder injection molding. Background technique [0002] Titanium and its alloys have low density, high specific strength, high corrosion resistance, and good biocompatibility, and are widely used in chemical, biomedical, aviation, navigation, automobile and other fields. However, due to the characteristics of high melting point, active chemical properties at high temperature, and high hardness, titanium and its alloys have been considered as difficult-to-process materials in industry. Titanium powder injection molding (Ti-MIM) technology can manufacture titanium parts with near-net shape and complex shapes, and can overcome the problems of machining difficulties and large machining allowances of titanium products. [0003] Use cheap titanium hydride (TiH 2 ) powder as the raw material powder for injection molding, and the developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/22
CPCB22F3/225B22F1/103B22F1/10
Inventor 曹仕秀敬小龙陈慧姜中涛邓莹
Owner CHONGQING UNIV OF ARTS & SCI