Experiment method for accelerating superhard coatings part rolling contact fatigue failure
A rolling contact fatigue and experimental method technology is applied in the field of accelerating the rolling contact fatigue failure of superhard coating parts, which can solve the problems of difficult to accurately characterize the bonding strength, contact fatigue strength and tribological properties of the coating parts. Evaluating time, the effect of shortening the initiation time
Inactive Publication Date: 2008-02-06
YANSHAN UNIV
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Problems solved by technology
Simple and commonly used experimental methods that deviate from actual working conditions, such as nano-scratch, nano-indentation and high-frequency impact test evaluation methods, are difficult to accurately characterize the layer-base bonding strength, contact fatigue strength and tribology of coated parts under actual working conditions performance
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[0016] 1. Preparation of accelerated fatigue additives: Under laboratory conditions, the accelerated fatigue additives were prepared. Wherein, the raw material used is submicron SiC (purity: 99%, origin: Xuzhou Hongwu Nano Material Co., Ltd.). By adding submicron SiC (200nm) to lubricating oil, the addition amount is 2% by mass, and ultrasonic dispersion treatment is carried out, and the ultrasonic dispersion time is 20 minutes, so as to obtain the fatigue-accelerating additive.
[0017] 2. Preparation of accelerated fatigue specimens: Under laboratory conditions, the tested superhard coating specimens were placed in a superhard coating rolling contact fatigue testing machine, added with accelerated fatigue additives for lubrication, and the number of stress cycles was 1.6×10 5 The second time, the test piece is prepared as an accelerated fatigue test piece.
[0018] 3. Preparation of fatigue specimens: Under laboratory conditions, the prepared superhard coating accelerated f...
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Abstract
The present invention relates to an experimental method which can accelerate the rolling contact fatigue invalidation of a superhard coating part. the present invention is characterized in that: firstly, the preparation of fatigue accelerating additive; secondly, the preparation of superhard coating fatigue accelerating specimens; thirdly, the superhard coating fatigue accelerating specimens are positioned in a superhard coating rolling contact fatigue experimental machine and pure lubricating oil is used as the lubricating medium to carry through a normal fatigue experiment until the superhard coating fatigue accelerating specimens generate the rolling contact fatigue invalidation. The present invention uses superhard particle to produce original micro-crack in the surface of contacting area and to generate induced and extended function to the material defect of the relative sliding surface. The time from no crack to the generation of a crack on the superhard coating specimen is effectively shortened, so the time of estimating the rolling contact fatigue performance of superhard coating specimen is saved.
Description
technical field [0001] The invention relates to an experimental method for accelerating rolling contact fatigue failure of superhard coating parts. The method can obtain the same experimental results as the fatigue behavior of the conventional fatigue test method; the acceleration ratio of the accelerated fatigue test is about 3, and the accelerated fatigue test method saves the time consumed in the fatigue test. This method is suitable for evaluating the rolling contact fatigue performance of superhard coating parts and studying its failure mechanism. Background technique [0002] Contact fatigue damage is one of the main failure modes of transmission parts. The evaluation of the contact fatigue performance of coated parts is very important to users. Simple and commonly used experimental methods that deviate from actual working conditions, such as nano-scratch, nano-indentation and high-frequency impact test evaluation methods, are difficult to accurately characterize the...
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IPC IPC(8): G01N19/04G01N3/56G01N3/00G01M13/02
Inventor 齐效文杨育林
Owner YANSHAN UNIV