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Method and device for testing friction pair material pair adhesion coefficient

A technology of adhesion coefficient and testing equipment, which is applied in the direction of measuring equipment, analyzing materials, adopting mechanical equipment, etc., and can solve the problems of moving parts stuck, motion failure, etc.

Active Publication Date: 2020-08-18
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Abstract
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Problems solved by technology

Most of the friction pairs are made of metal materials. Since the working environment of the moving parts of space machinery is vacuum, the friction pair materials of the moving parts are in vacuum, especially in ultra-high vacuum (pressure lower than 1.3×10 -7 Pa) environment is prone to cold welding, which will cause the moving parts to get stuck or even fail to move

Method used

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  • Method and device for testing friction pair material pair adhesion coefficient
  • Method and device for testing friction pair material pair adhesion coefficient
  • Method and device for testing friction pair material pair adhesion coefficient

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Embodiment Construction

[0032] The specific implementation of this test method will be described in detail below with reference to the accompanying drawings.

[0033] like figure 1 As shown, the test device of the present invention includes a vacuum chamber, a material paired upper sample clamp that can be adjusted up and down, a balance lever for loading and unloading the test load, an upper and lower electromagnetic coil for loading and unloading, and a magnetically permeable glass sealing cylinder; wherein,

[0034] The upper end of the material pairing upper sample fixture that can be adjusted up and down is connected to the vacuum chamber to achieve vacuum sealing. The lower end (the end face exposed to the vacuum chamber) is fixed with a screw hole structure to fix the upper sample to be tested, and a threaded rod is installed at the middle axis of the bellows, outside the vacuum chamber. The lower end of the bellows can be moved up and down by rotating the matching nut without affecting the se...

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Abstract

The invention provides a method and device for testing the adhesion coefficient of a friction pair couple material. The method and device provided by the invention can realize loading and unloading ofnormal test load on the couple material in vacuum and ultrahigh vacuum environments and accurate measurement of cold welding force (adhesive force). According to the testing method for the adhesion coefficient of friction pair couple material, the action force generated by electromagnetic coils and magnets is transmitted to the couple material via a balancing lever so as to realize loading and unloading of the couple material in a vacuum environment, and thus, the measurement of cold welding force and adhesive force is accomplished; and a ratio of the cold welding force to the adhesive forceis calculated so as to obtain the adhesion coefficient of couple material in the vacuum environment.

Description

technical field [0001] The invention relates to a method and device for testing the adhesion coefficient of friction pair materials, in particular to a method for testing the cold welding force (adhesion) and adhesion coefficient of a friction pair material pair of space machinery moving parts in a vacuum or ultra-high vacuum environment, It belongs to the field of space mechanical tribology. Background technique [0002] The cold welding phenomenon refers to the fact that in vacuum, especially in the ultra-high vacuum environment, when two pieces of metal of the same material or different materials are in contact, an adhesion effect occurs at the contact interface, which causes the two pieces of metal to bond together, just like automatic welding. Together. This phenomenon occurs because in a vacuum environment, the two metal surfaces are in an extremely "clean" state, and there is nothing between the atoms of the two different metals to separate them. The force between t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/02G01N19/04
CPCG01N19/02G01N19/04
Inventor 周晖万志华张凯峰郝宏曹珍胡继星
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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