摻鉻類石墨碳膜在潤滑油條件下的摩擦學(xué)性能研究
[Abstract]:It has been proved in industrial practice that solid lubricating coating and liquid lubricant can reduce the friction and wear of moving pairs effectively. The newly developed graphite-like carbon film has good anti-friction and wear-resistant effect, but its thermal stability is poor, wear is not easy to replenish its use range, if used in combination with liquid lubricants, it can play a role of taking advantage of each other. At present, the research on solid-liquid composite lubrication technology has just started, so far, there is no research report on the friction behavior of graphite-like carbon film under solid-liquid composite lubrication condition. Chromium-doped graphite carbon films were prepared by closed-field unbalanced magnetron sputtering ion plating. The friction and wear experiments of chromium-doped graphite carbon film and uncoated (matrix material) were carried out under the condition of three kinds of lubricating oil (paraffin-based lubricating oil, synthetic lubricating oil, mechanical oil) by using a ball-disk friction and wear tester. The effects of load and sliding velocity on the composite lubrication system were investigated by changing the load and sliding velocity of different lubricating oil and chromium-doped graphite carbon film. The friction and wear mechanism under solid-liquid lubrication was investigated by means of optical microscope, scanning electron microscope, electron spectroscopy and laser confocal microscope. In addition, the effect of lubricating oil additive (MoDTC,ZDDP) on the friction characteristics of the composite lubrication system was also studied. The friction and wear properties of chromium-doped graphite carbon film and lubricant were studied. The results show that liquid lubricant can improve the friction and wear properties of chromium-doped graphite carbon film. The specific wear rate of chromium-doped graphite carbon film is lower and the friction coefficient is higher than that of uncoated graphite carbon film under lubricating oil condition. The friction coefficient of chromium-doped graphite carbon film decreases with the increase of load under the condition of mechanical oil. The friction coefficient and specific wear rate of chromium-doped graphite carbon film at 160N 15 # (one of mechanical oil) conditions are the lowest. The friction and wear performance of composite lubricating oil under synthetic lubricating oil condition is related to the viscosity of lubricating oil. Low viscosity synthetic lubricating oil (PAO-4) has lower friction coefficient and specific wear rate. Under the condition of paraffin-based lubricating oil, the friction coefficient of chromium-doped graphite carbon film decreases first and then increases with the increase of load, and the specific wear rate is the lowest at 120N. It is found that the sliding velocity has little effect on the wear performance of the composite lubrication system. In the study of the effect of additives on the friction and wear properties of solid-liquid composite lubrication system, it was found that after the additive MoTDC was added to the lubricating oil, some thin film spalling appeared at the friction interface and did not prolong the service life of the film. After adding the additive ZDDP, the friction coefficient and specific wear rate decrease, the friction interface wear mark is slight, the wear degree is improved, and the friction-reducing and wear-resisting property is good.
【學(xué)位授予單位】:陜西理工學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TH117
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