TiC particle-reinforced titanium-aluminum-molybdenum-silicon alloy material synthesized in situ and preparation method thereof

A silicon alloy material and particle reinforcement technology, 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: 2013-01-02
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-silicon alloy material of the present invention comprises the following steps:

[0043] 1) Ingredients: The alloy material is Ti-0.2%Al-2.7%Mo-0.3%Si-0.5%C. Weigh 300-mesh aluminum powder, 800-mesh graphite powder, 600-mesh molybdenum powder, 300-mesh silicon 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 ...

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-0.2%Si-1.5%C. Weigh 500-mesh aluminum powder, 1500-mesh graphite powder, 400-mesh molybdenum powder, 500-mesh silicon 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; The difference from step 3) 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 flow of argon gas is adjusted to make the furnace work The air pressure reaches 30Pa; the difference from step 6) is that it is sintered at a temperature of 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-0.2%Si-1.5%C prepared by the above method has a flexural strength of 790Mpa, a relative density of 94%, and a hardness of...

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-0.4%Si-1.0%C. Weigh 400-mesh aluminum powder, 2000-mesh graphite powder, 300-mesh molybdenum powder, 500-mesh silicon 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; Step 3) The difference is that 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 rate is adjusted to make the working pressure in the furnace reach 50Pa; the difference from step 6) is that it is sintered at a temperature of 1450°C for 4 hours, and the rest are the same as in implementation 1. The alloy material Ti-1.5%Al-2.8%Mo-0.4%Si-1.0%C prepared by the above method has a bending strength of 880Mpa, a relative density of 97%, and a hardness ...

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Abstract

The invention discloses a TiC particle-reinforced titanium-aluminum-molybdenum-silicon alloy material synthesized in situ. The alloy material consists of the following components in percentage by mass: more than or equal to 0.2 percent and less than or equal to 2.5 percent of Al, more than or equal to 0.5 percent and less than or equal to 1.5 percent of C, more than or equal to 2.5 percent and less than or equal to 3 percent of Mo, more than or equal to 0.2 percent and less than or equal to 0.4 percent of Si and the balance of Ti and inevitable impurities. The alloy material is prepared with a method comprising the following steps of: (1) preparing materials: weighing corresponding amounts of aluminum powder, graphite powder, molybdenum powder, silicon powder and titanium powder according to the percentage by mass; (2) mixing through ball milling; (3) making a mixture sieved through ball milling in the step (2) pass through a bidirectional die pressing green compact; (4) placing a green compact onto the cathode of a vacuum container; (5) adjusting the vacuum degree in a furnace; and (6) after argon reaches the working air pressure, sintering a blank and the cathode through particle bombardment. Carbon serving as an alloying element is introduced into an alloy instead of a part of aluminum, and a measure for introducing a high-melting-point diffused TiC particle phase-strengthened substrate through solution strengthening of carbon and a rapid sintering in-situ reaction of a hollow cathode is used, so that a low-cost particle-reinforced alloy material with high strength and high wear resistance is obtained.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/05
Inventor 刘子利刘希琴费飞周桂斌朱晓春
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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