In-situ synthesized TiC particle-reinforced titanium aluminium alloy material and preparation method thereof

A titanium-aluminum alloy and particle-reinforced technology, which is applied in the field of powder metallurgy, can solve the problems of limited application development, high manufacturing cost, and complicated process, and achieve the effects of facilitating the densification process, increasing wear resistance, and inhibiting surface diffusion

Active Publication Date: 2013-01-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment investment required for the above-mentioned new technology is large, the process is complicated, and the manufacturing cost is high, which limits its application and development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method (hollow cathode sintering method) of the present invention for in-situ synthesis of TiC particles reinforced titanium-aluminum alloy material comprises the following steps:

[0042] 1) Ingredients: Titanium-aluminum alloy material is Ti-0.2%Al-0.5%C. Weigh 300-mesh aluminum powder, 800-mesh graphite powder and 300-mesh titanium powder according to the alloy ratio.

[0043] 2) Ball milling and mixing: put the above-mentioned powder into a ball milling tank at a ball-to-material ratio of 5:1, and mill at a speed of 350r / min for 1h. In order to prevent the powder from oxidation during the ball milling process, the ball milling jar is filled with argon gas for protection. Then pass the ball-milled mixture through the 100-mesh sieve specified in GB / T6005.

[0044] 3) Pass the ball-milled and sieved mixture in step 2) through a bidirectional molded compact, and the molded pressure is 400Mpa.

[0045] 4) An anode and a hollow cathode are set in the va...

Embodiment 2

[0057] This example is the same as Example 1, except that the titanium-aluminum alloy material prepared in step 1) is Ti-0.6%Al-1.5%C. Weigh 500-mesh aluminum powder, 1500-mesh graphite powder and 500-mesh titanium powder according to the ratio of the alloy; the difference from step 2) is that the speed is 300r / min, and the ball milling time is 1.5h; the difference from step 3) is the mold used The pressure is 600Mpa; the difference from step 4) is that the distance between the blanks placed on the cathode is 20mm; the difference from step 5) is that the argon flow is adjusted to make the working pressure in the furnace reach 30Pa; the difference from step 6) It was sintered at a temperature of 1350° C. for 6 hours, and all the others were the same as in Implementation 1. The titanium-aluminum alloy material Ti-0.6%Al-1.5%C prepared by the above method has a flexural strength of 850Mpa and a relative density of 97%.

Embodiment 3

[0059] This example is the same as Example 1, except that the titanium-aluminum alloy material prepared in step 1) is Ti-1.5%Al-1.0%C. Weigh 400-mesh aluminum powder, 2000-mesh graphite powder and 400-mesh titanium powder according to the ratio of the alloy; the difference from step 2) is that the rotation speed is 250r / min, and the ball milling time is 2h; the difference from step 3) is the molding pressure used It is 500Mpa; the difference from step 4) is that the distance between the blanks placed on the cathode is 15mm; the difference from step 5) is that the argon flow is adjusted to make the working pressure in the furnace reach 50Pa; the difference from step 6) is Sintering at a temperature of 1450° C. for 4 hours, the rest are the same as in Implementation 1. The titanium-aluminum alloy material Ti-1.5%Al-1.0%C prepared by the above method has a flexural strength of 780Mpa and a relative density of 95%.

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Abstract

The invention discloses an in-situ synthesized TiC particle-reinforced titanium aluminium alloy material which comprises the following components by mass: 0.2%<=Al<=2.5%, 0.5%<=C<=1.5%, and the balance of Ti and inevitable impurities; the alloy material is prepared by the following method: 1) material preparation, that is, weighing corresponding amounts of aluminium powder, graphite powder and titanium powder according to the above mass ratio; 2) ball milling mixing; 3) performing compaction of the mixture after ball milling and sieving in step 2) through bidirectional mold pressing; 4) putting the green compact on a vacuum container cathode; 5) adjusting the vacuum degree of the furnace; 6) performing particle bombardment sintering of the green compact and the cathode when the argon reaches a working air pressure. According to the invention, carbon substitutes part of aluminium and is introduced into the alloy as an alloying element; and the particle-reinforced titanium aluminium alloy material with high strength, wear resistance, and low cost is obtained by means of carbon solid solution reinforcement and matrix reinforcement by introducing high-melting point dispersed TiC particles through hollow cathode rapid sintering in-situ reaction.

Description

technical field [0001] The invention relates to an in-situ synthesized TiC particle reinforced titanium-aluminum alloy material, which belongs to the technical field of powder metallurgy. The present invention also relates to a preparation method of the above-mentioned alloy material. Background technique [0002] Titanium is an important structural metal developed in the 1950s, with a melting point of 1670°C. Titanium alloys have been widely used as ideal aerospace engineering structural materials due to their high specific strength, high yield ratio, and good corrosion resistance. [0003] At room temperature, titanium alloys have three matrix structures, and titanium alloys are divided into the following three categories: α alloys, (α+β) alloys and β alloys. China is represented by TA, TC, and TB respectively. According to the application, it can be divided into structural titanium alloy and high-temperature titanium alloy (use temperature greater than 400°C). The mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/05
Inventor 刘子利刘希琴刘伯路王怀涛王文静
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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