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Novel TiAl base self-lubricating composite and preparing method

A composite material and a new type of technology are applied in the field of new TiAl-based self-lubricating composite materials and their preparation to achieve good tribological properties, good anti-wear and anti-wear properties, and improve tribological properties.

Inactive Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, liquid lubrication is limited by service temperature, thermal oxygen treatment and surface coating are limited by service time, so the above method is not suitable for working environments with high temperature or long service time

Method used

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  • Novel TiAl base self-lubricating composite and preparing method
  • Novel TiAl base self-lubricating composite and preparing method
  • Novel TiAl base self-lubricating composite and preparing method

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preparation example Construction

[0034] In the following examples, the WS-containing 2 The hollow sphere powders are composed of lubricating phase WS 2 and glassy phase, composed of WS 2 Prepared from powder and aqueous solution of sodium silicate containing auxiliary reagents. The present invention provides a specific preparation method, but does not limit its preparation method. The WS-containing 2 The hollow sphere powder of is also suitable for the present invention.

[0035] The present invention provides containing WS 2 The preparation method of the hollow spherical powder is: select WS 2The powder is added to the sodium silicate aqueous solution containing auxiliary reagents to form a mixed solution, and the resulting mixed solution is dried and then subjected to high-temperature melting treatment with oxygen-acetylene, and the molten droplet-shaped reactant is collected in water for condensation, and the upper layer of the collected water floats The particulate matter, after drying, is the requir...

Embodiment 1

[0038] A new type of TiAl-based self-lubricating composite material, with TiAl alloy doped with trace elements as the matrix, graphene nanosheets and WS-containing 2 The hollow spheres are the reinforcing phase and the lubricating phase. Among them, graphene nanosheets are 0.5wt.% of the mass of the matrix, containing WS 2 The quality of the hollow sphere is 3.0wt.% of the mass of the matrix; the WS-containing 2 The hollow sphere powder consists of a lubricating phase WS 2 Composed of and glass phase; the thickness of the graphene nanosheet is 20nm-2μm, and the particle size is 5-200μm; the matrix is ​​composed of Ti, Al, Cr, Nb, B in a molar ratio of 48:47:2: 2:1 composition.

[0039] Such as figure 1 Shown, a kind of preparation method of novel TiAl base self-lubricating composite material, it comprises the steps:

[0040] 1) According to the molar ratio of Ti:Al:Cr:Nb:B=48:47:2:2:1, weigh and select 10.70g Ti powder, 5.90g Al powder, 0.48g Cr powder, 0.86g Nb powder an...

Embodiment 2

[0047] A new type of TiAl-based self-lubricating composite material, with TiAl alloy doped with trace elements as the matrix, graphene nanosheets and WS-containing 2 The hollow spheres are the reinforcing phase and the lubricating phase. Among them, graphene nanosheets are 1wt.% of the mass of the matrix, containing WS 2 The quality of the hollow sphere is 4.0wt.% of the mass of the matrix; the WS-containing 2 The hollow sphere powder consists of a lubricating phase WS 2 and glass phase; the thickness of the graphene nanosheets is 20nm-2μm, and the particle size is 5-200μm; the TiAl matrix is ​​composed of Ti, Al, Cr, Nb, and B in a molar ratio of 48:47:2 :2:1 composition.

[0048] A kind of preparation method of novel TiAl-based self-lubricating composite material, it comprises the steps:

[0049] 1) According to the molar ratio of Ti:Al:Cr:Nb:B=48:47:2:2:1, weigh and select 10.70g Ti powder, 5.90g Al powder, 0.48g Cr powder, 0.86g Nb powder and 0.05 g B powder is used a...

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Abstract

The invention relates to a novel TiAl base self-lubricating composite. The novel TiAl base self-lubricating composite is characterized in that a TiAl base serves as a matrix, and graphene nanosheets and hollow spheres containing WS2 serve as an enhancing phase and a lubricating phase. The graphene nanosheets account for 0.5-1.5 wt.% of the matrix by mass, and hollow spheres containing WS2 account for 3.0-5.0 wt.% of the matrix by mass. A preparing method of the novel TiAl base self-lubricating composite comprises the following steps that elementary substance powder is weighed according to the mole ratio of elements contained in the TiAl base to serve as matrix materials, the graphene nanosheets and the hollow spheres containing WS2 are weighed according to the proportion, the materials are evenly mixed and then subjected to spark plasma sintering, and the novel TiAl base self-lubricating composite is obtained. With the graphene nanosheets and the hollow spheres containing WS2 as the enhancing phase and the lubricating phase, the TiAl base self-lubricating composite is high in compactness, good in mechanical property and high in abrasion relieving and resisting performance.

Description

technical field [0001] The invention relates to the field of solid self-lubricating composite materials, in particular to a novel TiAl-based self-lubricating composite material and a preparation method. Background technique [0002] TiAl alloy has excellent characteristics such as low density, high specific strength, corrosion resistance, high temperature oxidation resistance and high temperature mechanical properties, and is considered to be a new generation of lightweight and high temperature resistant structural materials. Parts made of TiAl alloy can work stably and efficiently at higher service temperatures. Therefore, the application of TiAl alloy in the industrial field will have a great development prospect. Lin Junpin et al. reported that TiAl alloys have been applied in Boeing 787 engines, and some countries in Japan and Europe have used TiAl alloys to make exhaust valves. At the same time, the application field of TiAI alloy is constantly expanding, not only in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C32/00C22C1/05C22C1/10
CPCC22C1/05C22C14/00C22C32/0089
Inventor 史晓亮邹佳亮杨慷沈桥黄玉春张奥章桥新
Owner WUHAN UNIV OF TECH
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