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Method for preparing high-performance powder metallurgy Ti6Al4V alloy

A powder metallurgy, high-performance technology, applied in the field of powder metallurgy titanium, can solve the problems affecting the mechanical properties of Ti6Al4V alloy products, high content of interstitial oxygen atoms, loss of alloying elements, etc., to promote industrial development, avoid high oxygen increment, Small grain size effect

Active Publication Date: 2020-08-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of crushing after hydrogenation will lead to the loss of alloying elements, and it is necessary to add alloying elements in the subsequent powder mixing step. At the same time, because the hydrogenation dehydrogenation powder is fine and irregular in shape, the specific surface area is large, and the content of interstitial oxygen atoms is high, which seriously affects Ti6Al4V. Mechanical Properties of Alloy Products

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: 4.2wt.% VCl 3 , 14.9wt.% aluminum powder, the balance is TiCl 2 , where the particle size D of the aluminum powder 50 = 50 μm. Concrete preparation steps are as follows:

[0025] (1) VCl meeting the formula requirements 3 、TiCl 2 Put it into the mixing tank with aluminum powder, and mix it on the mixer for 12 hours to obtain a uniform mixed powder;

[0026] (2) heat-treating the mixed powder under vacuum at a temperature of 600° C. for a holding time of 4 hours to obtain a heat-treated product;

[0027] (3) Put the heat-treated product into a ball mill tank for high-energy ball milling, the ball-to-material ratio is 6:1, and crush for 72 hours to obtain fine Ti6Al4V alloy powder;

[0028] (4) Put the fine Ti6Al4V alloy powder in a high-purity argon-protected glove box and put it into a silica gel sheath to vibrate. After sealing, perform cold isostatic pressing. The pressing pressure is...

Embodiment 2

[0031] According to the mass percentage, it is composed of the following ingredients: 4.5wt.% VCl 3 , 15.2wt.% aluminum powder, the balance is TiCl 2 , where the particle size D of the aluminum powder 50 = 200 μm. Concrete preparation steps are as follows:

[0032] (1) VCl meeting the formula requirements 3 、TiCl 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 750° C. for a holding time of 3 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 10:1, and crush for 48 hours to obtain fine Ti6Al4V powder;

[0035] (4) Put the fine Ti6Al4V alloy powder in a high-purity argon-protected glove box and put it into a rubber sheath to vibrate. After sealing, perform cold isostatic pressing. The pressing pressure is 400M...

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Abstract

The invention provides a method for preparing a high-performance powder metallurgy Ti6Al4V alloy, and belongs to the field of powder metallurgy titanium. The invention proposes that TiCl2, VCl3 and aluminum powder are taken as raw materials and mixed uniformly in a certain proportion, and finally the high-performance Ti6Al4V alloy is obtained after heat treatment-ball grinding-forming-sintering. During the heat treatment of the powder, TiCl2 and VCl3 respectively have redox reaction with the aluminum powder, Cl removes a matrix in the form of gaseous AlCl3, and the generated Ti, V and Al are further reacted and diffused, after being crushed by ball milling, fine Ti6Al4V powder is obtained, and after forming and sintering, the high-performance Ti6Al4V alloy with the oxygen content of 0.12wt.% and the density of more than or equal to 99% is finally obtained. The preparation process of the invention is simple, pressureless sintering can densify Ti6Al4V, the grain size is small, the loss of alloying elements caused by a hydrogenation process is effectively avoided, and high oxygen increment caused by an element powder mixing method is also avoided, thereby providing a new idea for thepreparation of low-oxygen high-performance Ti6Al4V alloys.

Description

technical field [0001] The invention belongs to the field of powder metallurgy titanium and provides a method for preparing high-performance powder metallurgy Ti6Al4V alloy. Background technique [0002] Titanium and titanium alloys have high specific strength, good corrosion resistance and biocompatibility, and can maintain their mechanical properties even at relatively high service temperatures. Expanding in industries such as automobiles has economic and social benefits. Due to its excellent comprehensive properties, Ti6Al4V is the most widely used titanium alloy, accounting for about 60% of the total titanium output. However, the high activity of titanium makes the preparation process of traditional cast titanium alloy complicated, the conditions are harsh, the production cost is expensive, and the material utilization rate is low. Powder metallurgy has the advantage of near-net shape, which avoids the solid-liquid phase transition during vacuum melting, reduces energy...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04B22F3/04B22F3/10C22C1/05C22C14/00
CPCB22F9/04B22F3/04B22F3/1007C22C1/05C22C14/00B22F2009/043B22F2998/10B22F1/142B22F1/145
Inventor 杨芳周洋邵艳茹郭志猛陈存广王海英隋延力
Owner UNIV OF SCI & TECH BEIJING
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