Copper-graphite-tungsten disulfide nanotube self-lubricating composite material and preparation method thereof

A technology of tungsten disulfide and composite material, which is applied in the field of transition metal sulfide nanotube reinforced copper-based self-lubricating composite material and its preparation, can solve the problems of reduced lubricating performance, dependence on atmosphere, weak van der Waals force, etc. Excellent friction and wear properties, avoiding chemical reactions, and enhancing wettability

Active Publication Date: 2013-04-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is easy to absorb gas in the air to form a lubricating film and has good lubricating properties, but its lubricating properties are dominated by adsorbed gas. Under vacuum conditions, the friction coefficient of graphite is twice that of air, and the wear is even as high as a thousand times.
Tungsten disulfide has a layered close-packed hexagonal structure similar to graphite. The layers are bound by strong covalent bonds, and the layers are weaker van der Waals force, which is easy to slide along the close-packed surface. It has excellent lubricating performance, but it is easily oxidized in humid air, thus reducing the lubricating performance
[0003] With the rapid development of the modern aerospace industry, more and more mechanical parts need to work under different atmospheric conditions, and the demand for metal-based self-lubricating composite materials that can adapt to different environments is becoming more and more urgent. However, the traditional single-lubricant composite Materials are difficult to meet this requirement
Since the lubricating effect of a single solid lubricant is dependent on the atmosphere, it cannot provide sufficient lubrication under different atmospheric conditions

Method used

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  • Copper-graphite-tungsten disulfide nanotube self-lubricating composite material and preparation method thereof
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  • Copper-graphite-tungsten disulfide nanotube self-lubricating composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: Copper-10wt% graphite-10wt% tungsten disulfide nanotube self-lubricating composite material

[0033] The process steps are as follows:

[0034] 1. Grinding: Grind 6g of tungsten disulfide nanotubes for 30 minutes, then place them in absolute ethanol for ultrasonic dispersion for 6 hours, remove the absolute ethanol and put them in a vacuum drying oven to dry at 100°C.

[0035] 2. Sensitization: place the ground and dried tungsten disulfide nanotubes in 0.1mol / L SnCl 2 The solution was ultrasonically oscillated for 30 minutes, centrifuged (15,000 rpm) and washed with deionized water until the solution was neutral (pH=7), then placed in absolute ethanol for ultrasonic dispersion for 6 hours, removed from absolute ethanol and placed Dry in a vacuum oven at 100°C.

[0036] 3. Activation: Place the sensitized tungsten disulfide nanotubes in 0.0024mol / L PdCl 2The solution was ultrasonically oscillated for 30 minutes, centrifuged (15000 rpm) and washed with water...

Embodiment 2

[0043] Example 2: Preparation of copper-7wt% graphite-3wt% tungsten disulfide nanotube self-lubricating composite material

[0044] The preparation method of this example is the same as Example 1, the difference is that the mass ratio of copper, graphite and tungsten disulfide nanotubes is 90:7:3, and the discharge plasma sintering is carried out under vacuum conditions, and the vacuum degree is 10 -4 Pa, the sintering temperature is 800°C, the heating rate is 50°C / min, the pressure is 50MPa, and the holding time is 10min.

[0045] The copper-7wt% graphite-3wt% tungsten disulfide nanotube self-lubricating composite material with a density of 97.8%, a Brinell hardness of 85.7HB and a flexural strength of 193.2MPa was prepared by the above process.

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Abstract

The invention discloses a copper-graphite-tungsten disulfide nanotube self-lubricating composite material and a preparation method thereof, wherein the self-lubricating composite material is prepared by taking copper as a substrate and graphite as well as tungsten disulfide nanotube as solid lubricating additives through a spark plasma sintering process, and consists of the following components in percentage by weight: 80-90% of copper, 7-10% of graphite and 3-10% of tungsten disulfide nanotube. The preparation method comprises the following steps of: grinding, sensitizing, activating and chemically copper-plating the tungsten disulfide nanotube, uniformly mixing with electrolytic copper powder and graphite powder in proportion through a mechanical ball-milling process; and implementing a spark plasma sintering process to the mixing powder, to prepare the tungsten disulfide nanotube and graphite reinforced copper-base self-lubricating composite material. The copper-base self-lubricating composite material prepared by the preparation method disclosed by the invention is high in mechanical intensity, excellent in friction and abrasion resistance and good in environmental suitability.

Description

1. Technical field [0001] The invention relates to a self-lubricating composite material with copper as a matrix, tungsten disulfide nanotubes and graphite as solid lubricating additives and a preparation method thereof, in particular to a transition metal sulfide nanotube-reinforced copper-based self-lubricating composite material and its preparation method. its preparation method. 2. Background technology [0002] Copper-based self-lubricating composite materials containing solid lubricants (graphite, molybdenum disulfide, tungsten disulfide, etc.) have both the characteristics of matrix copper and solid lubricants, that is, good electrical and thermal conductivity and excellent friction and wear properties, and are widely used Widely used in industrial fields, such as brushes, contact slides, bearings, etc. Graphite is easy to absorb gas in the air to form a lubricating film and has good lubricating properties, but its lubricating properties are dominated by the adsorbed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/14C22C47/04C22C49/02C22C49/14C22C101/08C22C121/02
Inventor 凤仪钱刚李斌张学斌黄仕银刘红娟丁克望
Owner HEFEI UNIV OF TECH
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