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A silver-tungsten disulfide composite brush-slip ring system

A technology of tungsten disulfide and composite materials, which is applied in the field of brush material modification, can solve the problems of short service life and low energy consumption, and achieve the effects of long service life, low energy consumption and improved mechanical properties

Inactive Publication Date: 2015-10-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the short service life defect of the brush-slip ring system used in spacecraft in the prior art, and aims to provide a silver-tungsten disulfide with long service life, high stability during use and low energy consumption Composite brush-slip ring system

Method used

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  • A silver-tungsten disulfide composite brush-slip ring system
  • A silver-tungsten disulfide composite brush-slip ring system

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0024] Mix 76% Ag-2.5Cu alloy powder (-400 mesh) and 24% WS by mass percentage 2 The powder (particle size 600-800nm) is evenly mixed, and then the silver-tungsten disulfide composite brush is prepared according to the powder metallurgy hot-pressing method, the hot-pressing temperature is 900-920°C, the target pressure is 25MPa, the holding time is 25min, and the protective atmosphere is nitrogen or argon gas. The relative density of the brush prepared by the above formula and process is 99.4%, the hardness (HB) is 70.5, and the resistivity is 5.43×10 -8 Ω m; under the conditions of load 5N and sliding speed 0.21m / s, the volumetric wear rate is 8.0×10 when paired with AgCu10 slip ring (diameter 50mm) -15 m 3 / N·m, the service life is greater than 600,000 revolutions, the static contact resistance is <0.65mΩ, and the average friction coefficient is 0.179.

Embodiment 3

[0026] According to the mass percentage, 72% Ag-2.5Cu alloy powder (-400 mesh) and 28% WS 2 The powder (particle size 600-800nm) is evenly mixed, and then the silver-tungsten disulfide composite brush is prepared according to the powder metallurgy hot-pressing method, the hot-pressing temperature is 900-920°C, the target pressure is 25MPa, the holding time is 25min, and the protective atmosphere is nitrogen or argon gas. The relative density of the brush prepared by the above formula and process is 99.6%, the hardness (HB) is 71.4, and the resistivity is 6.39×10 -8 Ω m; under the conditions of load 5N and sliding speed 0.21m / s, the volumetric wear rate is 7.5×10 when coupled with AgCu10 slip ring (diameter 50mm) -15 m 3 / N·m, the service life is greater than 650,000 revolutions, the static contact resistance is <0.65mΩ, and the average friction coefficient is 0.172.

Embodiment 4

[0028] Mix 76% Ag-3Cu alloy powder (-400 mesh) and 24% WS by mass percentage 2 The powder (particle size 600-800nm) is evenly mixed, and then the silver-tungsten disulfide composite brush is prepared according to the powder metallurgy hot-pressing method, the hot-pressing temperature is 900-920°C, the target pressure is 25MPa, the holding time is 25min, and the protective atmosphere is nitrogen or argon gas. The relative density of the brush prepared by the above formula and process is 98.2%, the hardness (HB) is 73.5, and the resistivity is 6.17×10 -8 Ω m; under the conditions of load 5N and sliding speed 0.21m / s, the volumetric wear rate is 7.4×10 when paired with AgCu10 slip ring (diameter 50mm) -15 m 3 / N·m, the service life is greater than 650,000 revolutions, the static contact resistance is <0.41mΩ, and the average friction coefficient is 0.2.

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Abstract

The invention discloses an electric brush-sliding ring system made of silver-tungsten disulfide composite materials. The electric brush-sliding ring system comprises a silver-tungsten disulfide composite electric brush and Ag-Cu10 sliding ring. The electric brush-sliding ring system disclosed by the invention has the advantages that the stability is high in use, the service life is long and the energy consumption is less; and compared with the traditional system made of silver (copper)-molybdenum disulfide or silver (copper)-graphite material, the electric brush-sliding ring system is better in effect and wide in application range.

Description

technical field [0001] The invention relates to a silver-tungsten disulfide composite brush-slip ring system, which belongs to the field of brush material modification. Background technique [0002] Silver has extremely high electrical and thermal conductivity, making it an ideal electrical contact material. At present, silver-based solid self-lubricating materials are mainly used in electrical contact elements in aerospace vehicles, such as power transmission components on geosynchronous orbit satellites and the International Space Station. [0003] The solid lubricant in the brush is the key to solve the lubrication problem under the conditions of high load, high and low temperature, high vacuum, strong radiation and strong corrosion, so it is required to have the following characteristics: better wear resistance and lower friction coefficient; the adhesion to the metal substrate should be strong; in a certain temperature range or atmosphere, it can maintain stable perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14B22F5/10
Inventor 张雷李景夫周科朝肖金坤
Owner CENT SOUTH UNIV
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