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Powder metallurgy method of Ti-6Al-4V alloy

A ti-6al-4v, powder metallurgy technology, applied in the field of powder metallurgy titanium, can solve the problems of restricting large-scale use, difficult processing, high cost of titanium alloys, etc., and achieve the effects of efficient and stable production, improved density, and excellent performance.

Inactive Publication Date: 2011-07-27
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost and difficult processing of titanium alloys have always restricted its large-scale use.
However, there is no report on the use of high-speed pressing technology to form titanium alloy powder in the world.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Lubricate the inner walls of the mold with an ethanol solution of zinc stearate. The -100 mesh Ti-6Al-4V alloy powder prepared by hydrogenation dehydrogenation method is used as raw material, and the ratio of impact energy to powder loading is 1065J: 9.65g. The powder is filled into the mold cavity, and after pre-pressing and exhausting, press green body. The green body was placed in a high vacuum sintering furnace, and sintered at 1250°C for 3 hours at a heating rate of 3°C / min, with a vacuum degree of 1×10 -3 ~1×10 -4 Pa. The powder metallurgy Ti-6Al-4V alloy was obtained with furnace cooling. The density measured by drainage method is 95.1%, the hardness HV is 261, and the compressive strength is 1600MPa.

Embodiment 2

[0016] Lubricate the inner walls of the mold with an ethanol solution of zinc stearate. The -200 mesh Ti-6Al-4V alloy powder prepared by hydrogenation dehydrogenation method is used as the raw material, and the ratio of impact energy to powder loading is 913J: 8.43g. green body. The green body was placed in a high vacuum sintering furnace, and sintered at 1250°C for 3 hours at a heating rate of 3°C / min, with a vacuum degree of 1×10 -3 ~1×10 -4 Pa. After cooling with the furnace, the powder metallurgy Ti-6Al-4V alloy is obtained. The density measured by drainage method is 96.0%, the hardness HV is 302, and the compressive strength is 1890MPa.

Embodiment 3

[0018] Lubricate the inner walls of the mold with an ethanol solution of zinc stearate. The -300 mesh Ti-6Al-4V alloy powder prepared by hydrogenation dehydrogenation method is used as the raw material, and the ratio of impact energy to powder loading is 304J: 7.43g. green body. The green body was placed in a high vacuum sintering furnace, and sintered at 1250°C for 3 hours at a heating rate of 3°C / min, with a vacuum degree of 1×10 -3 ~1×10 -4 Pa. After cooling with the furnace, the powder metallurgy Ti-6Al-4V alloy is obtained. The density measured by drainage method is 95.8%, the hardness HV is 291, and the compressive strength is 1880MPa.

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Abstract

The invention provides a powder metallurgy method of a Ti-6Al-4V alloy. The method is characterized by comprising the following steps of: lubricating the inner wall of a die with a lubricant, filling Ti-6Al-4V powder between -100 meshes and -300 meshes into a die cavity, prepressing, exhausting, and pressing a green body in the ratio of impact energy to powder filling amount of (304-1,065J):(7.43-9.65)g; and sintering the green body at the temperature rise speed between 3 DEG C per minute and 4DEG C per minute and the vacuum degree between 1*10<-3> Pa and 1*10<-4> Pa and at the temperature between 1,250 DEG C and 1,300 DEG C for 2-3 hours, and cooling to obtain the Ti-6Al-4V alloy. The method has a simple technical process, can be used for preparing a powder metallurgy titanium alloy with high performance by near-net-shape forming and short flow at low cost, and is suitable for industrial production. The titanium alloy prepared by adopting the method has the density of 95.1-97.8 percent, the Vickers hardness (HV) of 261-358 and the compression strength of 1,600-2,100 MPa.

Description

technical field [0001] The invention relates to a powder metallurgy titanium method, in particular to a titanium alloy powder metallurgy method. Background technique [0002] Titanium and titanium alloys have the advantages of low density, high specific strength, strong corrosion resistance, and excellent high-temperature performance. They have broad application prospects in petrochemical, aerospace, bioengineering, and automotive industries. However, the high cost and difficult processing of titanium alloy have always restricted its large-scale use. Therefore, it has always been one of the hot spots of titanium alloy research to seek a simple preparation process, reduce the manufacturing cost, and make it cost-effective to be accepted by the market. Due to the characteristics of near-net shape, powder metallurgy is an ideal process for manufacturing high-performance titanium alloys at low cost. However, the high work-hardening rate of titanium alloys makes it very difficu...

Claims

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Application Information

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IPC IPC(8): B22F3/16
Inventor 闫志巧蔡一湘
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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