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A method for preparing high-performance powder metallurgy titanium-aluminum intermetallic compound

An intermetallic compound and powder metallurgy technology, applied in the field of powder metallurgy titanium, can solve the problems of difficulty in obtaining high-density titanium-aluminum intermetallic compounds, high oxygen content of titanium-aluminum intermetallic compound powder, and powder particle size that cannot be too fine, etc. Promote the development of industrialization, realize the effect of sintering densification and small grain size

Active Publication Date: 2021-08-31
天津海力特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the titanium-aluminum intermetallic compound prepared by the pre-alloyed powder method has fine grains and good room temperature plasticity, but the cost is high and the process is complicated.
Although the element powder mixing method overcomes the above shortcomings, volume expansion occurs during the sintering process, resulting in defects such as cracks; at the same time, titanium powder and aluminum powder are used as raw materials in the element powder mixing process, but the oxygen content in the powder is high. The oxygen in the system cannot be removed during the process, resulting in a high oxygen content in the titanium-aluminum intermetallic compound powder, which seriously affects its mechanical properties
Limited by the oxygen content of the powder, the particle size of the powder should not be too fine, and it is difficult to obtain high-density titanium-aluminum intermetallic compounds through pressureless sintering with coarse powder as raw material. It is often necessary to strengthen the density by hot isostatic pressing, spark plasma sintering, etc. means to improve its density, there are problems such as high cost and limited shape and size, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the mass percentage, it is composed of the following ingredients: 30wt.% aluminum powder, and the balance is TiCl 2 , where the particle size D of the aluminum powder 50 = 100 μm. Concrete preparation steps are as follows:

[0025] (1) TiCl that meets the formula requirements 2 Put it into the mixing tank with aluminum powder, and mix it on the mixer for 15 hours to obtain a uniform mixed powder;

[0026] (2) heat-treating the mixed powder under vacuum at a temperature of 650° C. for a holding time of 5 hours to obtain a heat-treated product;

[0027] (3) Put the heat-treated product into a ball mill tank for high-energy ball milling, with a ball-to-material ratio of 10:1, and crush for 48 hours to obtain fine titanium-aluminum intermetallic compound powder;

[0028] (4) Put the fine titanium-aluminum intermetallic compound powder in a high-purity argon-protected glove box and put it into a silica gel sheath to vibrate. After sealing, carry out cold iso...

Embodiment 2

[0031] According to the mass percentage, it is composed of the following ingredients: 48wt.% aluminum powder, and the balance is TiCl 2 , where the particle size D of the aluminum powder 50 = 350 μm. Concrete preparation steps are as follows:

[0032] (1) TiCl that meets the formula requirements 2 Put it into the mixing tank with aluminum powder, and mix it on the mixer for 10 hours to obtain a uniform mixed powder;

[0033] (2) heat-treating the mixed powder under vacuum at a temperature of 800° C. for a holding time of 4 hours to obtain a heat-treated product;

[0034] (3) Put the heat-treated product into a ball mill tank for high-energy ball milling, with a ball-to-material ratio of 8:1, and crush for 72 hours to obtain fine titanium-aluminum intermetallic compound powder;

[0035] (4) Put the fine titanium-aluminum intermetallic compound powder in a high-purity argon-protected glove box and put it into a rubber sheath to vibrate. After sealing, carry out cold isostati...

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Abstract

The invention provides a method for preparing a high-performance powder metallurgy titanium-aluminum intermetallic compound, belonging to the field of powder metallurgy titanium. The present invention proposes to TiCl 2 It is evenly mixed with a certain proportion of aluminum powder, and after heat treatment-ball milling-forming-sintering, a high-performance titanium-aluminum intermetallic compound is finally obtained. During powder heat treatment, TiCl 2 Oxidation-reduction reaction with aluminum powder, AlCl 3 The matrix will be removed in a gaseous state, and the generated Ti and Al will further react and diffuse, and after ball milling and crushing, a fine titanium-aluminum intermetallic compound powder will be obtained. 99% High Performance Titanium Aluminum Intermetallic. The preparation process of the invention is simple, the densification of the titanium-aluminum intermetallic compound can be realized through pressureless sintering, and the grain size is fine. It provides new ideas for the preparation of low-oxygen, low-cost, high-performance titanium-aluminum intermetallic compounds, and is conducive to promoting the industrialization of powder metallurgy titanium-aluminum intermetallic compounds.

Description

technical field [0001] The invention belongs to the field of powder metallurgy titanium and provides a method for preparing high-performance powder metallurgy titanium-aluminum intermetallic compound. Background technique [0002] Titanium-aluminum intermetallic compounds have an ordered structure and can maintain strength and stiffness at high temperatures. At the same time, they have the advantages of low density, high specific strength, high elastic modulus and good oxidation resistance. They are expected to replace nickel-based superalloys for aerospace applications. High-temperature structural materials in the fields of aerospace, national defense and military industry. However, the as-cast titanium-aluminum intermetallic compound has coarse structure, severe segregation, anisotropy, etc., poor ductility and fracture toughness at room temperature, narrow thermal processing window, poor high-temperature deformation ability, and traditional preparation and processing are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04B22F3/04B22F3/10C22C1/05C22C14/00
CPCB22F9/04B22F3/04B22F3/1007C22C1/05C22C14/00B22F2009/043B22F2998/10B22F1/142B22F1/145C22C1/047
Inventor 杨芳周洋邵艳茹郭志猛陈存广王海英隋延力
Owner 天津海力特新材料有限公司
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