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Preparation method for Ti-6Al-4V alloy part

A technology of ti-6al-4v and alloy, which is applied in the field of alloy parts manufacturing, can solve problems affecting the strength and performance of alloys, uneven structure, segregation of titanium components, etc., and achieve the effects of increasing compactness, inhibiting oxidation, and reducing pores

Inactive Publication Date: 2018-07-27
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, when Ti-6Al-4V alloys are used as raw materials to prepare parts, melting, casting or powder metallurgy processes are mostly used. The melting and casting processes have defects of titanium composition segregation and uneven structure, which not only affect the strength and performance of the alloy, but also produce The Ti-6Al-4V alloy also has limitations in the application of complex shape parts
When Ti-6Al-4V alloy parts are prepared by powder metallurgy, although parts with complex shapes can be prepared, the strength of the obtained alloy parts is low, which limits its application

Method used

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  • Preparation method for Ti-6Al-4V alloy part

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preparation example Construction

[0023] The invention provides a kind of preparation method of Ti-6Al-4V alloy part, comprises the following steps:

[0024] (1) The mixture comprising spherical Ti-6Al-4V alloy powder, non-spherical Ti-6Al-4V alloy powder and catalytic degreasing type binder is carried out banburying, and alloy feed is obtained after granulation; under protective atmosphere;

[0025] (2) Carry out injection molding and pressure-holding sequentially to the alloy feeding material that described step (1) obtains, obtain the molded blank of alloy parts;

[0026] (3) Under a protective atmosphere, degrease the formed blank of the alloy part obtained in the step (2) to obtain a pre-sintered body;

[0027] (4) Under vacuum conditions, sinter the pre-sintered body obtained in the step (3), and obtain Ti-6Al-4V alloy parts after cooling.

[0028] In the invention, the mixed material comprising spherical Ti-6Al-4V alloy powder, non-spherical Ti-6Al-4V alloy powder and catalytic degreasing binder is ba...

Embodiment 1

[0053] Three kinds of Ti-6Al-4V alloy powders (equiaxed powder with an average particle size of 48.75 μm, coarse spherical powder with an average particle size of 35.28 μm and fine spherical powder with an average particle size of 23.66 μm) were mixed, non-spherical, coarse spherical The mass ratio to the fine spherical powder is 52:36:12, and it is mixed on a double planetary mixer for 6h at a speed of 30rpm.

[0054] According to the ratio of POM: HDPE: EVA: PW: SA = 86:5:5:3:1, it is prepared as a catalytic degreasing adhesive.

[0055] Put 400g of catalytic degreasing binder into a clean plastic cup, put 2500g of Ti-6Al-4V alloy powder prepared above into another clean plastic cup, then put the two plastic cups into the mixing area of ​​the internal mixer, Nitrogen (purity: 99.9%) is charged into the mixing area of ​​the internal mixer, and the internal mixer is preheated simultaneously. When the temperature reaches 180°C and the oxygen content in the working area is lowe...

Embodiment 2

[0060] Three kinds of Ti-6Al-4V alloy powders (irregular flaky powder with an average particle size of 48.75 μm, coarse spherical powder with an average particle size of 35.28 μm and fine spherical powder with an average particle size of 23.66 μm) were mixed, non-spherical, coarse The mass ratio of spherical and fine spherical powders is 55:40:15, mixed on a double planetary mixer for 5h at a speed of 40rpm.

[0061]According to the ratio of POM: HDPE: EVA: PW: SA = 84:4:5:4:1, it is prepared as a catalytic degreasing adhesive.

[0062] Put 400g of catalytic degreasing binder into a clean plastic cup, put 2500g of Ti-6Al-4V alloy powder prepared above into another clean plastic cup, then put the two plastic cups into the mixing area of ​​the internal mixer, Nitrogen (purity: 99.9%) is charged into the mixing area of ​​the internal mixer, and the internal mixer is preheated simultaneously. When the temperature reaches 180°C and the oxygen content in the working area is lower t...

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Abstract

The invention provides a preparation method for a Ti-6Al-4V alloy part. A mixture of spherical Ti-6Al-4V alloy powder, nonspherical Ti-6Al-4V alloy powder and a catalytic degreasing binder is subjected to banburying at the protective atmosphere, the material obtained through banburying are pelletized, and then alloy feed is obtained; the alloy feed is sequentially subjected to injection molding and pressure maintaining, and an alloy part forming blank is obtained; at the protective atmosphere, the alloy part forming blank is subjected to degreasing, and a presintering body is obtained; and under the vacuum condition, the presintering body is subjected to sintering, and after cooling, the Ti-6Al-4V alloy part is obtained. According to the alloy part obtained through the method, the tensilestrength can reach 765 MPa, and the bending strength can reach 1,145 MPA. Alloy parts in complex shapes can be prepared.

Description

technical field [0001] The invention belongs to the field of manufacturing alloy parts, and in particular relates to a preparation method of Ti-6Al-4V alloy parts. Background technique [0002] Ti-6Al-4V alloy has light weight, high strength, good corrosion resistance and excellent biocompatibility, and its density is 4.50g / cm 3 , are widely used in many fields such as medicine, sports, petrochemical industry, aerospace, metallurgy and light industry. At present, when Ti-6Al-4V alloys are used as raw materials to prepare parts, melting, casting or powder metallurgy processes are mostly used. The melting and casting processes have defects of titanium composition segregation and uneven structure, which not only affect the strength and performance of the alloy, but also produce The Ti-6Al-4V alloy also has limitations in the application of complex-shaped parts. When Ti-6Al-4V alloy parts are prepared by powder metallurgy process, although parts with complex shapes can be prep...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/22
CPCB22F1/0007B22F3/225B22F2999/00B22F2998/10B22F1/103B22F1/10B22F3/1007B22F3/1021B22F2201/11B22F2201/02
Inventor 罗铁钢毛新华符乃科李志董应虎路建宁
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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