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A kind of hot pressing sintering method of ti-6al-4v alloy

A hot-pressing sintering, ti-6al-4v technology, applied in the field of hot-pressing sintering of alloys, can solve the problems of difficult densification, high cost, and difficult densification of spherical titanium alloy powders.

Active Publication Date: 2018-01-23
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high work hardening rate of titanium, it is difficult to densify by traditional molding methods.
Especially spherical titanium alloy powder is difficult to densify. At present, the hot isostatic pressing method is generally used for forming and consolidation, and the cost is very high.

Method used

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  • A kind of hot pressing sintering method of ti-6al-4v alloy
  • A kind of hot pressing sintering method of ti-6al-4v alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix spherical Ti-6Al-4V powders of 50-75 μm and 300-420 μm in a ratio of 4:6 and pour them into graphite molds. Place the mold in a vacuum hot-press sintering furnace and vacuumize to 10 -3 Pa, the pressure is 30MPa, the temperature is raised to 1100°C at a sintering rate of 6°C / min, and the temperature is kept for 60min. After cooling with the furnace, Ti-6Al-4V alloy is obtained. Its density reaches 98.1%, its tensile strength at room temperature is 804MPa, and its elongation is 12.5%.

Embodiment 2

[0016] Mix spherical Ti-6Al-4V powders of 50-75 μm and 300-420 μm in a ratio of 5:5 and pour them into graphite molds. Place the mold in a vacuum hot-press sintering furnace and vacuumize to 10 -3 Pa, the pressure is 40MPa, the temperature is raised to 1200°C at a sintering rate of 10°C / min, and the temperature is kept for 50min. After cooling with the furnace, Ti-6Al-4V alloy is obtained. Its density reaches 98.3%, its tensile strength at room temperature is 810MPa, and its elongation is 13.9%.

Embodiment 3

[0018] Mix spherical Ti-6Al-4V powders of 50-75 μm and 300-420 μm in a ratio of 6:4 and pour them into graphite molds. Place the mold in a vacuum hot-press sintering furnace and vacuumize to 10 -3 Pa, the pressure is 50MPa, the temperature is raised to 1050°C at a sintering rate of 8°C / min, and the temperature is kept for 60min. After cooling with the furnace, Ti-6Al-4V alloy is obtained. Its density reaches 98.3%, its tensile strength at room temperature is 814MPa, and its elongation is 14.5%.

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Abstract

The invention relates to a hot-pressing method for sintering titanium-6 aluminum-4 vanadium (Ti-6AL-4V) alloy, which is characterized by comprising the steps: 50-75Mum and 300-420Mum Ti-6Al-4V alloy powder which are 4-6: 6-4 in quality radio are uniformly mixed; and the Ti-6Al-4V alloy powder is arranged in a die, is sintered for 40-60min in 1050-1200 DEG C and 30-50 MPa according to 5-10 DEG C / min of heating rate when vacuum degree is less than or equal to 10-3Pa, thereby obtaining powder titanium alloy. The hot-pressing method for sintering the titanium-6 aluminum-4 vanadium (Ti-6AL-4V) alloy is simple, is easy to control preparation process, can reduce cost of hot-pressing sintering of the Ti-6AL-4V, and is beneficial for market application promotion.

Description

technical field [0001] The invention relates to a hot-press sintering technology for alloys, in particular to a hot-press sintering method for titanium alloys. Background technique [0002] Titanium is widely used in aerospace, biomedical and other industries due to its high specific strength, good corrosion resistance, and excellent biocompatibility. However, the traditional titanium and titanium alloy processing technology is complicated, and the production cost is high, which seriously hinders the further market application of titanium. As a near-net shape method, powder metallurgy can reduce production costs, especially for expensive materials such as titanium. Therefore, the powder metallurgy technology of titanium and titanium alloys has become a research hotspot. [0003] High-tech industries such as aerospace and biomedicine have high requirements on the performance of powdered titanium alloys, and the raw materials generally need to use high-quality spherical tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14B22F1/00
Inventor 邹黎明毛新华刘辛蔡一湘
Owner GUANGDONG INST OF NEW MATERIALS