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

A composite material and self-lubricating technology, applied in the field of materials, can solve the problems of limited material application, large friction coefficient and wear amount, and achieve the effects of improving mechanical properties, improving brittle defects, improving dry friction coefficient and wear rate

Active Publication Date: 2018-04-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When TiAl material slides under dry friction, a large friction coefficient and wear amount will occur, which greatly limits the application of this material

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the mass percentage, add 30% Ti with a particle size of 40 mesh 3 SiC 2 , the rest is sintered TiAl alloy powder with a particle size of 300 mesh, the mass percent of the TiAl alloy powder composition is 20% Al powder, 1% Cr powder, and the rest is Ti powder, and the above powder is uniformly mixed by planetary ball mill , the mixing process is carried out in an argon atmosphere, alcohol is used as a dispersant, the amount added is 3ml per 100g of mixed powder, the ball-to-material ratio is 2:1, the speed of the ball mill is set to 300r / min, and the ball milling time is 1h (forward and reverse Alternate operation, once every 30 minutes); after drying the uniformly mixed powder, put it into a cylindrical mold for pre-press molding, the pressure is 25MPa, the holding time is 10s, and then the pre-press block is dried; for the dried SPS sintering is performed on the pre-pressed block, the pressure is 20MPa, the vacuum degree is 10Pa, heated to 800°C, kept for...

Embodiment 2

[0025] According to the mass percentage, add 5% Ti with a particle size of 80 mesh 3 SiC 2 , the rest is sintered TiAl alloy powder with a particle size of 300 mesh, the mass percent of the TiAl alloy powder composition is 20% Al powder, 3% Cr powder, and the rest is Ti powder, and the above powder is uniformly ball-mixed by a planetary ball mill , the mixing process is carried out in an argon atmosphere, alcohol is used as a dispersant, the addition amount is 5ml per 100g of mixed powder, the ball-to-material ratio is 2:1, the ball mill speed is set to 300r / min, and the ball milling time is 2h (forward and reverse Alternate operation, once every 30 minutes); after drying the uniformly mixed powder, put it into a cylindrical mold for pre-press molding, the pressure is 25MPa, the holding time is 10s, and then the pre-press block is dried; for the dried SPS sintering is performed on the pre-pressed block, the pressure is 20MPa, the vacuum degree is 10Pa, heated to 1000°C, kept ...

Embodiment 3

[0027] According to the mass percentage, add 20% Ti with a particle size of 80 mesh 3 SiC 2 , the rest is sintered TiAl alloy powder with a particle size of 100 mesh, the mass percent of the TiAl alloy powder composition is 20% Al powder, 1% Cr powder, and the rest is Ti powder, and the above powder is uniformly ball-mixed by a planetary ball mill , the mixing process is carried out in an argon atmosphere, alcohol is used as a dispersant, the amount added is 5ml per g of mixed powder, the ball-to-material ratio is 2:1, the speed of the ball mill is set to 400r / min, and the ball milling time is 3h (forward and reverse Alternate operation, once every 30 minutes); After drying the uniformly mixed powder, put it into a cylindrical mold for pre-press molding, the pressure is 10MPa, the holding time is 10s, and then the pre-press block is dried; for the dried SPS sintering is performed on the pre-pressed block, the pressure is 20MPa, the vacuum degree is 10Pa, heated to 1200°C, kep...

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Abstract

The invention discloses a TiAl-based high-temperature-resistant self-lubricating composite. The composite is prepared from chemical components in percentage by mass as follows: 5%-30% of Ti3SiC2 and the balance of TiAl alloy powder. A preparation method of the TiAl-based high-temperature-resistant self-lubricating composite mainly comprises the steps as follows: the components, namely, Ti3SiC2 andthe TiAl alloy powder are subjected to ball-milling and are evenly mixed, the rotating speed of a ball mill is 300-450 r / min, and the ball-milling time is 2-4 h; the mixed powder is dried and then iscontained in a mold for pre-pressing molding, SPS sintering is performed on the dried pre-pressed powder, the pressure is 20-50 MPa, the vacuum degree is 10-40 Pa, the powder is heated to 800-1,200 DEG C, the temperature is kept for 10-30 min, the heating rate is 50-100 DEG C / min, the powder is subjected to furnace cooling, and a blank is obtained; surface treatment is performed on the blank, andthe TiAl-based high-temperature-resistant self-lubricating composite is obtained. The composite is fatigue-resistant, impact-resistant, high-temperature-resistant and high in carrying capacity, the self-lubricating performance can be realized, the friction coefficient and the abrasion loss can be reduced, and the self-lubricating performance is more excellent under the high-temperature condition.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a lubricating composite material. Background technique [0002] The high friction coefficient and wear amount of TiAl alloy have aroused extensive attention of experts. In order to improve the friction and wear properties of TiAl alloy, Shi Xiaoliang et al. added different weight percentages of Ti 3 SiC 2 and MoS 2 Lubricating Phase Preparation of TiAl-based self-lubricating composites (TMC). Studies have shown that adding 10wt% (Ti 3 SiC 2 -MoS 2 ) The TMC of the lubricating phase has good tribological properties due to the unique layered structure of the friction surface [Zhai W, Shi X, Wang M, et al.Friction and WearProperties of TiAl-Ti 3 SiC 2 -MoS 2 Composites Prepared by Spark Plasma Sintering[J].Tribology Transactions,2014,57(3):416-424.]; Zhang Qiaoxin and others provide a TiAl-graphene-Ti 3 SiC 2 Self-lubricating composite material, the prepared composite ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C32/00
Inventor 邹芹关勇罗文奇李晓普赵玉成李艳国王明智
Owner YANSHAN UNIV
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