TiC-particle-reinforced titanium-aluminum-molybdenum alloy material by in-situ synthesis and preparation method thereof

A technology of particle reinforcement and in-situ synthesis, applied in the field of powder metallurgy, can solve the problems of limited application development, high manufacturing cost, complex process, etc., and achieve the effect 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

[0042] The preparation method (hollow cathode sintering method) for in-situ synthesis of TiC particle reinforced titanium-aluminum-molybdenum alloy material of the present invention comprises the following steps:

[0043] 1) Ingredients: The alloy material is Ti-0.2%Al-2.7%Mo-0.5%C. Weigh 300-mesh aluminum powder, 800-mesh graphite powder, 600-mesh molybdenum powder and 300-mesh titanium powder according to the alloy ratio.

[0044] 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.

[0045] 3) Pass the ball-milled and sieved mixture in step 2) through a bidirectional molded compact, and the molded pressure is 400Mpa.

[0046] 4) An anode and a h...

Embodiment 2

[0058] This example is the same as Example 1, except that the alloy material prepared in step 1) is Ti-0.6%Al-2.5%Mo-1.5%C. Weigh 500-mesh aluminum powder, 1500-mesh graphite powder, 400-mesh molybdenum powder and 500-mesh titanium powder according to the alloy ratio; the difference from step 2) is that the speed is 300r / min, and the ball milling time is 1.5h; it is different from step 3). The difference is that the molding pressure used 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; and Step 6) The difference is that it is sintered at 1350°C for 6 hours, and the rest are the same as in Implementation 1. The alloy material Ti-0.6%Al-2.5%Mo-1.5%C prepared by the above method has a flexural strength of 825Mpa and a relative density of 95%.

Embodiment 3

[0060] This example is the same as Example 1, except that the alloy material prepared in step 1) is Ti-1.5%Al-2.8%Mo-1.0%C. Weigh 400-mesh aluminum powder, 2000-mesh graphite powder, 300-mesh molybdenum powder and 400-mesh titanium powder according to the proportion of the alloy; the difference from step 2) is that the speed is 250r / min, and the ball milling time is 2h; different from step 3) The molding pressure used 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; and the step 6) The difference is sintering at 1450°C for 4 hours, and the rest are the same as implementation 1. The alloy material Ti-1.5%Al-2.8%Mo-1.0%C prepared by the above method has a flexural strength of 900Mpa and a relative density of 96%.

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Abstract

The invention discloses a TiC-particle-reinforced titanium-aluminum-molybdenum alloy material by in-situ synthesis. The alloy material comprises, by mass, 0.2%<=Al<=2.5%, 0.5%<=C<=1.5%, 2.5%<=Mo<=3% and the balance Ti and inevitable impurities. The alloy material is prepared according to a method including: 1) compounding by weighing powdered aluminum, graphite powder, molybdenum powder and titanium powder of a corresponding quantity according to the mass percent; 2) ball-milling and mixing; 3) pressing mixture subjected to ball milling and sieving by means of bidirectional mould pressing; 4) placing a green pressing on a cathode of a vacuum container; 5) regulating the vacuum degree in a furnace; and 6) performing particle bombardment sintering for the pressing and the cathode after argon gas reaches the working gas pressure. Carbon substitutes for part of aluminum to serve as an alloying element to be introduced to alloy, and a means that high-melting-point dispersed TiC particle phases are introduced to reinforce a matrix by solid solution strengthening of C and hollow cathode rapid sintering in-situ reaction, so that the TiC-particle-reinforced titanium-aluminum-molybdenum alloy material which is high in strength and wear resistance and low in cost is obtained.

Description

technical field [0001] The invention relates to an in-situ synthesized TiC particle reinforced titanium-aluminum-molybdenum 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04
Inventor 刘子利刘希琴周桂斌朱晓春刘伯路
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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