The lubricating state of the lubricating oil in the four-ball machine friction coefficient test mainly depends on the adsorption effect of the additive and the metal surface and the effect of the frictional chemical reaction to form the boundary film. When the friction coefficient is between 0.05 and 0.1, it is generally in the boundary lubrication state. Due to the different types and properties of additives added to the lubricating oil, the effect of improving boundary lubrication under different loads is different. The organic phosphide is mainly produced in the boundary lubrication and friction reaction is an iron phosphate film, and the active sulfide exists in the presence of air. The formation of iron sulfide films on the exposed and emerging metal surfaces at high temperatures reduces the friction coefficient, reduces wear, and increases load-bearing capacity. This improves the boundary lubrication, especially when the friction modifiers are When the abrasive and extreme pressure agent are matched, excellent antifriction and extreme pressure antiwear effects can be obtained.
Reproducibility Test of Lubricant Friction Coefficient Test This article was conducted on an MMW-1 type tester using the equivalent lubricant oil friction coefficient test method (ASTMD5183-95). Thirteen different types of test oils were selected. Each test oil was used in parallel. The test was conducted 3 times and the repeatability of the test method was examined. The test results show that the maximum standard deviation of friction coefficient is 0.016, and the maximum standard deviation of wear increment is 0.06mm, showing good repeatability.
Lubricating oil friction coefficient method is suitable for anti-friction, anti-wear and extreme pressure performance evaluation of various types of lubricating oils. It has strong distinguishing ability and reproducibility for the study of mechanism of action of friction modifiers, anti-wear agents and extreme pressure agents. it is good. During the full load test, when the friction coefficient is between 0.05-0.10, the test is in the boundary lubrication state, and the lubrication of the boundary film formed by the lubricating oil additive is effective; when the friction modifier, antiwear agent and extreme pressure When the agent is properly matched, the anti-friction and extreme pressure anti-wear effects can be obtained. The establishment of this method fills the domestic gap and will play a role in promoting the research of the mechanism of contemporary high-grade lubricant compound formulations.
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