B2 type NiAl-based self-lubricating composite materials and preparing method thereof

A technology of composite materials and mixed powders, which is applied in the field of B2-type NiAl-based self-lubricating composite materials and its preparation, achieving the effects of low price, high density and high feasibility

Active Publication Date: 2014-04-30
重庆三木汽车部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have improved the tribological properties of NiAl intermetallic compounds to a certain extent, but the rapid development of high-tech industries such as aerospace has put forward more stringent requirements for the friction, wear and lubrication of structural materials; simply by improving the NiAl intermetallic The mechanical and physical properties of the compound to improve the tribological properties of the NiAl intermetallic compound can no longer meet the requirements, so it is urgent to develop suitable lubricants and self-lubricating materials

Method used

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  • B2 type NiAl-based self-lubricating composite materials and preparing method thereof
  • B2 type NiAl-based self-lubricating composite materials and preparing method thereof
  • B2 type NiAl-based self-lubricating composite materials and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 Shown, the preparation method of B2 type NiAl base self-lubricating composite material, it comprises the steps:

[0028] 1) Using Ni powder and Al powder as matrix raw materials, graphene and WS 2 It is a solid lubricant and a reinforcing phase. According to the molar ratio of Ni:Al:Mo:Nb=48:50:1:1, the intermetallic compound NiAl matrix pre-sintered powder is mixed, and 6.469 grams of Ni powder and 3.097 grams of Al powder are weighed. 0.221g Mo powder and 0.213g Nb powder total 10g, then add 0.1g nano-graphene and 0.4g WS 2 into the above-mentioned mixed powder to obtain ingredients;

[0029] 2) Put the above-mentioned ingredients into a vibrating ball mill for dry grinding, the inner wall of the vibrating ball mill tank is made of polytetrafluoroethylene, the vibration frequency is 45 Hz, the amplitude is 5 mm, the vibration force is 10000 N, the power is 0.75 kilowatts, and the oscillation time is 30 minutes, and the desired result is obtained. P...

Embodiment 2

[0033] 1) Using Ni powder and Al powder as matrix raw materials, graphene and WS 2 It is a solid lubricant and a reinforcing phase. According to the molar ratio of Ni:Al:Mo:Nb=48:50:1:1, the intermetallic compound NiAl matrix pre-sintered powder is mixed, and 6.469 grams of Ni powder and 3.097 grams of Al powder are weighed. 0.221g Mo powder and 0.213g Nb powder total 10g, then add 0.2g nano-graphene and 0.6g WS 2 into the above-mentioned mixed powder to obtain ingredients;

[0034] 2) Put the above-mentioned ingredients into a vibratory ball mill for dry grinding, the inner wall of the vibratory ball mill tank is made of polytetrafluoroethylene, the vibration frequency is 45 Hz, the amplitude is 5 mm, the vibration force is 10000 N, the power is 0.75 kilowatts, and the oscillation time is 40 minutes. Processed mixed powder;

[0035] 3) The pretreated mixed powder is placed in a graphite mold with an inner diameter of 20 mm, and then spark plasma sintering is carried out und...

Embodiment 3

[0038] 1) Using Ni powder and Al powder as matrix raw materials, graphene and WS 2 It is a solid lubricant and a reinforcing phase. According to the molar ratio of Ni:Al:Mo:Nb=48:50:1:1, the intermetallic compound NiAl matrix pre-sintered powder is mixed, and 6.469 grams of Ni powder and 3.097 grams of Al powder are weighed. 0.221g Mo powder and 0.213g Nb powder total 10g, then add 0.3g nano-graphene and 0.8g WS 2 into the above-mentioned mixed powder to obtain ingredients;

[0039] 2) Put the above-mentioned ingredients into a vibratory ball mill for dry grinding, the inner wall of the vibratory ball mill tank is made of polytetrafluoroethylene, the vibration frequency is 45 Hz, the amplitude is 5 mm, the vibration force is 10000 N, the power is 0.75 kilowatts, and the oscillation time is 50 minutes. Processed mixed powder;

[0040] 3) Place the pretreated mixed powder in a graphite mold with an inner diameter of 20mm, and then conduct spark plasma sintering (SPS) under vac...

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Abstract

The invention provides B2 type NiAl-based self-lubricating composite materials and a preparing method thereof. The method comprises the following steps that (1) Ni powder, Al powder, Mo powder, Nb powder, nano grapheme and WS2 powder are selected according to proportion, and ingredients are obtained; (2) the ingredients are placed in a vibration ball mill for dry grinding, the inner wall of a vibration ball milling tank is made of Teflon, vibration frequency is 45 Hz, amplitude is 5 mm, vibration force is 10000 N, vibration time is 30 minutes-50 minutes, and preprocessed mixed powder is obtained; and (3) the preprocessed mixed powder is placed in a graphite mould with the inner diameter of 20 mm, and then under the vacuum condition, a spark plasma sintering method is used for the B2 type NiAl-based self-lubricating composite materials. The self-lubricating composite materials obtained through the method are high in purity and good in compactness and have good tribology performance. In addition, through the spark plasma sintering method, sintering temperature is lowered, sintering time is shortened, the steps are simple and convenient to achieve, and large-scale batch production can be well achieved.

Description

technical field [0001] The invention relates to a B2-type NiAl-based self-lubricating composite material containing layered tungsten disulfide and nano graphene synergistically lubricated and enhanced and a preparation method thereof. Background technique [0002] The B2-type NiAl intermetallic compound has a high melting point (1640°C), low density (5.86g / cm 3 ), high thermal conductivity, oxidation resistance, high temperature stability and other unique physical and mechanical properties, it has been used as a structural material in harsh environments such as high temperature. ([1] Liu Wu, Gao Qiang, Wu Yanping. Research progress of NiAl-based composite materials. Journal of Liaoning University of Engineering and Technology, 2005,24(4):595-598.). [0003] However, as a structural material, in many cases, NiAl intermetallic compounds will inevitably rub against other materials. Therefore, the tribological properties of NiAl intermetallic compounds are also very important. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C1/05
Inventor 史晓亮姚杰徐增师翟文正宋思远陈龙朱庆帅肖业成章桥新王玉伏冯四平张崧
Owner 重庆三木汽车部件有限公司
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