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TiAl-based high-temperature resistant self-lubricating composite material and preparation method thereof

A composite material, self-lubricating technology, applied in the field of composite materials, can solve the problems of no high temperature resistance, limited application, poor lubrication performance, etc., and achieve the effect of improving brittle defects and high self-lubricating performance

Inactive Publication Date: 2019-12-31
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned sintered composite materials have improved the wear resistance of the composite material to a certain extent, because they do not have high temperature resistance and poor lubricity at high temperatures, products made of such materials ( Such as friction plate, etc.) cannot maintain its excellent performance under severe working conditions such as high temperature, thus limiting the application of such materials in high temperature fields

Method used

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  • TiAl-based high-temperature resistant self-lubricating composite material and preparation method thereof
  • TiAl-based high-temperature resistant self-lubricating composite material and preparation method thereof
  • TiAl-based high-temperature resistant self-lubricating composite material and preparation method thereof

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preparation example Construction

[0037] The above Ti 3 AlC 2 -Preparation method of TiC-TiAl based high temperature resistant self-lubricating composite material, including:

[0038] Step S1, preparing TiAl mixed powder:

[0039] In an argon atmosphere, the Ti, Al, and Cr powders are ball-milled and mixed uniformly to obtain a TiAl mixed powder.

[0040] In this step, in the process of preparing TiAl mixed powder, instead of simply mixing the three powders of Ti, Al, and Cr, ball milling and mixing are performed, and mechanical alloying is used during the mixing process to make the The three metal elements interdiffused to form a more active alloy matrix.

[0041] Further, when ball milling and mixing, the ball-to-material ratio is 2-10:1, the rotation speed is 200-400r / min, the ball milling time is 3-10h, and the forward and reverse runs alternately every 20-40min. Using this ball milling process, the obtained TiAl mixed powder has higher activity.

[0042] Preferably, the particle size of the raw mater...

Embodiment 1

[0067] This embodiment provides a Ti 3 AlC 2 -TiC-TiAl based high temperature resistant self-lubricating composite material, the preparation method of which is:

[0068] After adding a dispersant to the raw material powder composed of titanium carbide powder and titanium powder with a molar ratio of 4:6, carry out ball milling. The dispersant is analytically pure ≥99.7% industrial ethanol, and 0.6mL of dispersant is added to every 10g of powder; Both 5mm and 8mm WC carbide balls are used in the ball milling process, the mass ratio of large and small balls is 7:3; the mass ratio of balls and materials is 12:1, the speed is 350r / min, the ball milling is 20h, and each revolution is 60min. Shut down for 20 minutes to dissipate heat and produce TiC finer than 150nm 0.4 .

[0069] Then 70-mesh Ti, 80-mesh Al, and 70-mesh Cr powders were ball-milled and mixed evenly. The mixing process was carried out in an argon atmosphere. The ball-milling process used both 5mm and 8mm WC cement...

Embodiment 2

[0072] This embodiment provides a Ti 3 AlC 2 -TiC-TiAl based high temperature resistant self-lubricating composite material, the preparation method of which is:

[0073] After adding a dispersant to the raw material powder composed of titanium carbide powder and titanium powder with a molar ratio of 8:2, carry out ball milling. The dispersant is analytically pure ≥99.7% industrial ethanol, and 0.6mL of dispersant is added to every 10g of powder; Both 5mm and 8mm WC cemented carbide balls are used in the ball milling process, the mass ratio of large and small balls is 7:3; the mass ratio of balls and materials is 10:1, the speed is 600r / min, the ball mill is 70h, and each revolution is 60min. Shut down for 20 minutes to dissipate heat and produce TiC0.8 finer than 150nm.

[0074] Then 140-mesh Ti, 170-mesh Al, and 200-mesh Cr powder were ball-milled and mixed evenly. The mixing process was carried out in an argon atmosphere. The ball-milling process used both 5mm and 8mm WC c...

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Abstract

The invention provides a TiAl-based high-temperature resistant self-lubricating composite material and a preparation method thereof, and belongs to the field of composite materials. The composite material is prepared by mixing and sintering raw materials, and comprises the following raw materials of, in percentage by mass, 5-50% of TiCx, 5-50% of Ti3AlC2 or Ti3SiC2, and the balance of TiAl mixed powder; the TiAl mixed powder comprises the following components of, in percentage by mass, 5-40% of Al, 1-5% of Cr, and the balance Ti; and x in TiCx is greater than or equal to 0.4 but smaller than or equal to 0.9 or x is equal to 1.1. The composite material not only has high bearing performance, high strength and high temperature resistance, but also has a self-lubricating property at high temperature, and is beneficial to manufacturing friction materials under severe working conditions such as high temperature.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a TiAl-based high temperature resistant self-lubricating composite material and a preparation method thereof. Background technique [0002] TiAl-based composites are intermetallic compounds, which contain both metal bonds and covalent bonds, so they have both the toughness of metals and the high-temperature performance of ceramics, and they have low density, good specific strength and specific stiffness, and relatively low density. Excellent comprehensive performance such as strong oxidation resistance and corrosion resistance. Therefore, TiAl alloys have been applied in many fields, but the high friction coefficient and wear amount of TiAl alloys limit its wide application. In order to improve the friction and wear properties of TiAl alloys, many researchers have carried out extensive and in-depth research on TiAl-based composite materials. exploration. [0003] Xu Z et al. ...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067
Inventor 李艳国邹芹娄志超焦子剑代利峰卢晓乾袁东方陈伟东党赏熊建超
Owner YANSHAN UNIV
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