本文關(guān)鍵詞：邊界潤滑條件下碳煙對摩擦反應(yīng)膜機(jī)械性能的影響及其磨損機(jī)理研究　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 邊界潤滑 碳煙 摩擦反應(yīng)膜 機(jī)械性能 磨損機(jī)理

【摘要】：因燃油不完全燃燒而產(chǎn)生的碳煙會(huì)加劇發(fā)動(dòng)機(jī)中活塞環(huán)/缸套摩擦副的磨損,降低發(fā)動(dòng)機(jī)的使用壽命。尤其當(dāng)活塞處于上、下止點(diǎn)時(shí),這對摩擦副處于混合或邊界潤滑狀態(tài),碳煙所造成的磨損就更為嚴(yán)重。要解決這一問題,就必須探明碳煙對摩擦反應(yīng)膜的影響,因?yàn)槟Σ练磻?yīng)膜在很大程度上決定了處于混合或邊界潤滑狀態(tài)下的摩擦副的摩擦學(xué)性能。本學(xué)位論文在不同實(shí)驗(yàn)條件下對含ZDDP(二烷基二硫代磷酸鋅)和不同含量碳煙的液體石蠟進(jìn)行了摩擦學(xué)實(shí)驗(yàn),借助現(xiàn)代表面分析設(shè)備分別對摩擦表面的形貌、ZDDP摩擦反應(yīng)膜的分布狀態(tài)以及摩擦表面的力學(xué)性能進(jìn)行了表征與分析,為研究碳煙的磨損機(jī)理提供了新的方法。研究了摩擦反應(yīng)膜的機(jī)械性能隨碳煙含量的變化。結(jié)果表明:隨著碳煙含量的增加,摩擦表面ZDDP摩擦反應(yīng)膜的厚度減小,在摩擦表面的覆蓋率以指數(shù)形式降低;摩擦表面的硬度H降低,彈性模量E升高,平均H/E值以指數(shù)形式降低,且平均H/E值與ZDDP摩擦反應(yīng)膜覆蓋率呈線性關(guān)系。分別研究了未添加和添加3%碳煙時(shí)摩擦反應(yīng)膜的機(jī)械性能隨摩擦?xí)r間的變化。結(jié)果表明:隨著摩擦?xí)r間的增加,不添加碳煙時(shí)的ZDDP摩擦反應(yīng)膜厚度增加,摩擦表面的硬度H增大,彈性模量E穩(wěn)定在170 GPa左右,平均H/E值增加;添加3%碳煙時(shí)的ZDDP摩擦反應(yīng)膜厚度均勻性降低,摩擦表面的硬度H和彈性模量E出現(xiàn)波動(dòng),平均H/E值變化較亂;相對摩擦反應(yīng)膜覆蓋率和相對H/E值同步降低。分別研究了未添加和添加3%碳煙時(shí)摩擦反應(yīng)膜的機(jī)械性能隨載荷的變化。結(jié)果表明:隨著載荷的增加,未添加碳煙時(shí)的ZDDP摩擦反應(yīng)膜厚度先增大再減小,摩擦表面的硬度H先增加再降低,彈性模量E穩(wěn)定,平均H/E值先增加再降低;添加3%碳煙時(shí)的ZDDP摩擦反應(yīng)膜厚度降低,摩擦表面的硬度H先增加再降低,彈性模量E穩(wěn)定,平均H/E值先增加再降低;相對摩擦反應(yīng)膜覆蓋率線以線性形式降低,相對H/E值先降低再升高。碳煙的磨損機(jī)理歸于碳煙的磨粒磨損作用會(huì)將摩擦反應(yīng)膜刮離摩擦表面,降低摩擦反應(yīng)膜對基體的保護(hù)作用,進(jìn)而使摩擦表面的力學(xué)性能降低,摩擦副的減摩抗磨性能由此減弱。
[Abstract]:The soot caused by incomplete combustion of fuel fuel will increase the wear of piston ring / cylinder liner friction pair in the engine and reduce the service life of the engine, especially when the piston is at the top and bottom check point. The wear caused by soot is more serious when the friction pair is in the condition of mixing or boundary lubrication. In order to solve this problem, the influence of soot on the friction reaction film must be investigated. The tribological properties of friction pairs in mixed or boundary lubricated state are largely determined by friction reaction film. In this dissertation, ZDDP (zinc dialkyl dithiophosphate) was prepared under different experimental conditions. Tribological experiments were carried out with liquid paraffin with different soot contents. The distribution state of ZDDP friction film and the mechanical properties of the friction surface were characterized and analyzed by means of modern surface analysis equipment. It provides a new method for studying the wear mechanism of soot and studies the change of mechanical properties of the friction reaction film with the soot content. The results show that: with the increase of soot content. The thickness of the ZDDP friction reaction film on the friction surface decreases and the coverage of the friction surface decreases exponentially. The hardness H of friction surface decreases, the elastic modulus E increases, and the average H / E value decreases exponentially. The average H / E value is linearly related to the coverage of the ZDDP friction reaction film. The mechanical properties of the friction reaction film with or without adding 3% soot are studied respectively. The results show that the mechanical properties of the film vary with the friction time. With the increase of friction time. Without soot, the thickness of ZDDP friction reaction film increases, the hardness H of friction surface increases, the elastic modulus E is about 170 GPa, and the average value of H / E increases. When 3% soot was added, the thickness uniformity of the ZDDP friction reaction film decreased, the hardness H and the elastic modulus E of the friction surface fluctuated, and the mean H / E value changed unsteadily. The relative friction film coverage and the relative H / E value decreased synchronously. The mechanical properties of the friction reaction film with and without adding 3% soot were studied respectively. The results showed that the mechanical properties of the friction reaction film varied with the increase of the load. Without soot, the thickness of ZDDP friction reaction film first increases and then decreases, the hardness H of friction surface increases and then decreases, the elastic modulus E is stable, and the average H / E value increases first and then decreases. When 3% soot was added, the thickness of ZDDP friction reaction film decreased, the hardness H of friction surface increased and then decreased, the elastic modulus E was stable, and the average H / E value increased first and then decreased. The coverage line of relative friction reaction film decreases linearly and then increases relative to H / E. the wear mechanism of soot is attributed to the abrasive wear effect of soot which will remove the friction reaction film from the friction surface. By reducing the protective effect of the friction reaction film on the substrate, the mechanical properties of the friction surface are reduced, and the friction and antiwear properties of the friction pair are weakened.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH117.1

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