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Titanium-aluminum intermetallic compound-based self-lubricating composite material and preparation method thereof

A technology of intermetallic compounds and composite materials, which is applied in the field of titanium-aluminum intermetallic compound-based self-lubricating composite materials and its preparation, can solve the problems that the lubrication performance does not meet the requirements of practical applications, the hardness and strength of materials are low, and the composition of materials is complex. Achieve the effect of short sintering time, low wear rate and simple preparation process

Inactive Publication Date: 2020-04-24
XINJIANG UYGUR AUTONOMOUS REGION PROD QUALITY SUPERVISION & INSPECTION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of these methods is high, the material composition is complex, the requirements for equipment are high, the hardness and strength of the prepared material are also low, and the lubricating performance does not meet the requirements of practical applications.

Method used

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  • Titanium-aluminum intermetallic compound-based self-lubricating composite material and preparation method thereof

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preparation example Construction

[0026] The present invention also provides the preparation method of the titanium-aluminum intermetallic compound-based self-lubricating composite material, which is characterized in that it comprises the following steps:

[0027] (1) Take titanium-aluminum intermetallic compound powder and copper-clad graphite powder respectively, mix uniformly by mechanical ball mill;

[0028] (2) The mixture in step (1) is sintered by a spark plasma sintering method, and naturally cooled to room temperature after sintering to obtain a titanium-aluminum intermetallic compound-based self-lubricating composite material.

[0029] In one embodiment, the sintering process parameters are: the degree of vacuum is 10 -3 -10 -1 Pa; heating rate is 80-100°C / min, preferably 90-100°C / min; sintering temperature is 1000-1150°C, preferably 1050-1150°C; applied pressure is 30-40MPa; holding time is 10-15min.

[0030] In the present invention, the sintering parameters of rapid temperature rise and short si...

Embodiment 1

[0039] According to mass percentage, weigh 90% titanium-aluminum intermetallic compound powder (particle size is 85 μ m; Mole percentage is: 50% Ti, 46% Al, 2% Cr, 2% Nb) and 10% copper clad graphite powder (Cu The mass ratio of graphite and graphite is 1:1, the particle size is 350 mesh), the mixed powder is obtained by mechanical ball milling, and then the mixed powder is placed in a spark plasma sintering furnace for sintering, and the sintering parameters adopted are: the degree of vacuum is 5×10 -2 Pa, the heating rate is 90°C / min, the sintering temperature is 1050°C, the applied pressure is 35MPa, and the holding time is 10min. After the sintering is completed, it is cooled to room temperature with the furnace to obtain a titanium-aluminum intermetallic compound-based self-lubricating composite material.

[0040] The friction coefficient of the self-lubricating composite material is small, 0.30, and the data is stable, and its wear rate is 4.75×10 -4 mm 3 N -1 m -1 ,...

Embodiment 2

[0042]According to mass percentage, weigh 80% titanium-aluminum intermetallic compound powder (particle size is 100 μ m; Mole percentage is: 50% Ti, 46% Al, 2% Cr, 2% Nb) and 20% copper clad graphite powder (Cu The mass ratio of graphite to graphite is 1:1, and the particle size is 250 meshes). The mixed powder is obtained by mechanical ball milling, and then the mixed powder is placed in a spark plasma sintering furnace for sintering. The sintering parameters used are: the degree of vacuum is 1×10 -3 Pa, the heating rate is 100°C / min, the sintering temperature is 1150°C, the applied pressure is 30MPa, and the holding time is 15min. After the sintering is completed, it is cooled to room temperature with the furnace to obtain a titanium-aluminum intermetallic compound-based self-lubricating composite material.

[0043] The friction coefficient of the self-lubricating composite material is small, 0.29, and the data is stable, and its wear rate is 3.46×10 -5 mm 3 N -1 m -1 , ...

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Abstract

The invention discloses a titanium-aluminum intermetallic compound-based self-lubricating composite material, which is characterized in that the material is composed of the following components in terms of mass percentage: 65-90% titanium-aluminum intermetallic compound; and 10-35% Copper clad graphite. The invention also relates to a preparation method of the titanium-aluminum intermetallic compound-based self-lubricating composite material.

Description

technical field [0001] The invention relates to a titanium-aluminum intermetallic compound-based self-lubricating composite material and a preparation method thereof. Background technique [0002] The intermetallic compound-based self-lubricating composite material is a composite material formed by adding a solid lubricant to the intermetallic compound matrix and having both intermetallic compound properties and solid lubrication properties; wherein, the matrix intermetallic compound endows it with a certain strength and hardness , high temperature resistance, corrosion resistance and oxidation resistance. Titanium-aluminum intermetallic compounds have the advantages of light weight, high specific strength, high specific rigidity, high temperature resistance and excellent oxidation resistance, and are considered to be the next generation of lightweight high temperature resistant structural materials for aerospace. However, when used as engineering application components, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C1/10C22C30/00B22F3/105
CPCC22C1/0458C22C1/10C22C14/00C22C30/00B22F3/105C22C1/047
Inventor 李茂华刘莉杨军鹿毅李小飞杨博王龙姚海军
Owner XINJIANG UYGUR AUTONOMOUS REGION PROD QUALITY SUPERVISION & INSPECTION RES INST
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