本文選題：CrN涂層 + TiN涂層��； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：硬質(zhì)涂層和良好的潤滑狀況是改善機(jī)械零件表面摩擦學(xué)性能的有效措施。本文針對潤滑油及添加劑與硬質(zhì)涂層復(fù)合作用的摩擦學(xué)機(jī)理研究不夠深入的問題,考察了溫度對CrN、Ti N和摻鎢類金剛石(W-DLC)三種硬質(zhì)涂層在聚α烯烴(PAO)及含二烷基二硫代氨基甲酸鉬(MoDTC)潤滑條件下的摩擦磨損性能的影響及減摩抗磨機(jī)理,具有重要的理論意義及應(yīng)用價(jià)值。結(jié)果表明:(1)PAO潤滑時(shí),CrN/GCr15摩擦副的摩擦系數(shù)、CrN涂層磨損率及對磨球磨斑直徑均隨溫度升高而增大。MoDTC的加入降低了摩擦系數(shù),一定程度上減少了涂層及對磨球的磨損,且隨溫度升高,摩擦系數(shù)和涂層磨損率先減小后增大,對磨球磨斑直徑先增大后減小,75oC時(shí)由于摩擦副表面的摩擦反應(yīng)膜中MoS_2/MoO3比值較大而具有相對較好的摩擦學(xué)性能。磨損表面微觀形貌分析表明,CrN涂層的磨損機(jī)制包括磨料磨損、疲勞磨損、氧化磨損及輕微的黏著磨損。(2)PAO潤滑時(shí),TiN/GCr15摩擦副的摩擦系數(shù)和TiN涂層磨損率隨溫度升高而增大,對磨球磨斑直徑先減小在50 ℃之后也有所增加。MoDTC的加入降低了摩擦系數(shù),提高了涂層和對磨球的耐磨性,隨溫度升高,摩擦系數(shù)先減小后增大,涂層磨損率逐漸增大,而對磨球磨斑直徑整體呈減小趨勢,在50oC時(shí)涂層具有相對較好的摩擦學(xué)性能,是由于該溫度下摩擦副表面的摩擦反應(yīng)膜中含有較大的MoS_2/MoO3比值及較多減摩的TiO_2和FeSx。磨損機(jī)制主要為磨料磨損、氧化磨損及高溫下輕微的黏著磨損。(3)PAO潤滑時(shí),溫度對W-DLC/GCr15摩擦副的摩擦系數(shù)影響不大,但涂層磨損率及對磨球磨斑直徑隨溫度升高均有所減小,在高溫下明顯。MoDTC降低了摩擦系數(shù),提高了涂層耐磨性但增加了對磨球的磨損,隨溫度升高摩擦系數(shù)、涂層磨損率和對磨球磨斑直徑均先減小后增大,在125 ℃又有所減小,W-DLC涂層也在75oC時(shí)摩擦學(xué)性能較好,仍是因?yàn)樵摐囟认履Σ粮北砻婧休^多減摩的MoS_2及FeSx。不同的是W-DLC涂層的摩擦學(xué)行為還與其表面在不同溫度下的石墨化程度有關(guān)。磨損機(jī)制為磨料磨損、氧化磨損及少量黏著磨損。
[Abstract]:Hard coating and good lubrication are effective measures to improve the tribological properties of mechanical parts. In this paper, the tribological mechanism of the compound action of lubricating oil and additives with hard coating is not sufficiently studied. The effects of temperature on the friction and wear properties of three hard coatings, CrNN- Ti N and W-DLC, under the lubrication conditions of polyolefins (PAO) and molybdenum dithiocarbamate (MoDTC), were investigated. It has important theoretical significance and application value. The results show that: (1) the friction coefficient of CrN / GCr15 friction pair decreases with the increase of temperature, the wear rate of coating and the diameter of grinding spot increase with the increase of temperature, and the wear of coating and grinding ball is decreased to some extent, and the wear of grinding ball increases with the increase of temperature, the results show that: (1) when PAO is lubricated, the friction coefficient of CrN / GCr15 friction pair increases with the increase of temperature. The friction coefficient and coating wear first decreased and then increased. The friction coefficient and coating wear increased first and then decreased at 75oC. The friction coefficient and coating wear increased firstly and then decreased to 75oC, which resulted in a relatively good tribological performance due to the larger ratio of MoS-2 / MoO3 in the friction reaction film on the surface of friction pair. The wear mechanism of CRN coating includes abrasive wear, fatigue wear, oxidation wear and slight adhesion wear. (2) the friction coefficient of TiN / GCr15 friction pair and the wear rate of tin coating increase with the increase of temperature when PAO is lubricated. The friction coefficient of the coating and the wear resistance of the grinding ball were improved by decreasing the diameter of the grinding spot at 50 鈩，

本文編號(hào)：2096693