【摘要】：微孔高溫自補(bǔ)償潤滑復(fù)合材料是將熔融復(fù)合固體潤滑劑真空壓力下熔浸到微孔基體中而制備的一種新型的自潤滑復(fù)合材料。在高溫環(huán)境下工作時(shí),儲(chǔ)存于其孔隙內(nèi)的固體潤滑劑因摩擦熱-應(yīng)力作用析出到摩擦界面形成潤滑膜,從而實(shí)現(xiàn)自潤滑功能。其摩擦學(xué)特性取決于復(fù)合固體潤滑劑的析出量及組分組成。因此,建立熱-力耦合驅(qū)動(dòng)模型,研究固體潤滑劑析出機(jī)制及成膜機(jī)理,對于微孔高溫自補(bǔ)償潤滑復(fù)合材料的設(shè)計(jì)制備具有重要意義�；诙嗫捉橘|(zhì)球粒裝填理論和高溫自補(bǔ)償潤滑材料微孔結(jié)構(gòu)特征,建立胞體結(jié)構(gòu)模型;針對摩擦過程中的熱力耦合問題,對胞體模型溫度場和應(yīng)力場計(jì)算;針對潤滑劑析出的驅(qū)動(dòng)力,利用熱彈性力學(xué)理論建立熱力耦合驅(qū)動(dòng)模型,并對環(huán)境溫度、摩擦熱、摩擦力等影響因素分析。利用ANSYS Workbench完成熔滲型高溫自補(bǔ)償潤滑材料的瞬態(tài)熱分析和熱力耦合分析,得到摩擦過程中溫度場、應(yīng)力場分布變化規(guī)律及相關(guān)原因,分析潤滑劑和基體的溫度、應(yīng)力、應(yīng)變的變化趨勢,探討不同影響因素(加熱溫度、摩擦熱、孔變形擠壓力)對潤滑劑驅(qū)動(dòng)力的影響。仿真結(jié)果表明:加熱溫度對驅(qū)動(dòng)力具有增益效果,持續(xù)加熱后需考慮摩擦熱的影響;相對加熱溫度,摩擦熱對潤滑劑的驅(qū)動(dòng)力具有顯著的促進(jìn)作用,而孔變形產(chǎn)生的擠壓應(yīng)力影響較小;潤滑劑在加熱溫度、摩擦熱-應(yīng)力及變形擠壓的共同作用下析出到摩擦界面�；跐櫥w與基體材料的匹配性和互溶性,通過潤濕試驗(yàn),結(jié)合經(jīng)驗(yàn)公式分析,對固體潤滑劑進(jìn)行了組分設(shè)計(jì),其最佳配比為:Pb65Sn35+12~18%Ag+0.2~0.3%RE(Y2O3);采用高頻電磁感應(yīng)熔浸工藝實(shí)現(xiàn)了基體與潤滑劑的熔滲復(fù)合,制備出了熔滲型M3/2/TiC系高溫自潤滑復(fù)合材料。在銷盤式高溫摩擦磨損試驗(yàn)機(jī)上考察了其摩擦磨損性能,利用掃描電子顯微鏡(SEM)、光電子能譜(EDXA)和X射線衍射儀(XRD)分析磨損表面成分、形貌和結(jié)構(gòu)。結(jié)果表明:熔滲型高溫自潤滑復(fù)合材料在高溫摩擦磨損過程中,潤滑劑通過微孔通道析出至摩擦表面形成了一層含有Pb、Sn、Ag、RE等元素的固體潤滑膜;在Pb65Sn35-12Ag潤滑劑基礎(chǔ)上添加0.25%RE,潤滑性能相對提高;基于SEM表面形貌分析,探討了高溫自補(bǔ)償潤滑復(fù)合材料的成膜機(jī)理。
[Abstract]:Microporous high temperature self-compensation lubricating composite is a new type of self-lubricating composite material, which is prepared by melting melt composite solid lubricant into microporous matrix under vacuum pressure. At high temperature, the solid lubricant stored in the pore of the lubricant can form a lubricating film at the friction interface due to the effect of friction heat and stress, so that the self-lubricating function can be realized. Its tribological properties depend on the amount of precipitation and composition of the composite solid lubricant. Therefore, it is of great significance to establish a thermal-mechanical coupling drive model and study the precipitation mechanism and film formation mechanism of solid lubricant for the design and preparation of microporous high-temperature self-compensation lubricating composites. Based on the theory of spherical filling in porous media and the characteristics of micropore structure of high temperature self-compensating lubricating materials, the cell body structure model is established, and the temperature field and stress field of the cell body model are calculated according to the thermo-mechanical coupling problem in the friction process. According to the driving force of lubricant precipitation, the thermoelastic theory is used to establish the thermo-mechanical coupling driving model, and the influence factors such as ambient temperature, friction heat and friction force are analyzed. The transient thermal analysis and thermo-mechanical coupling analysis of infiltrated high-temperature self-compensation lubricating materials were completed by ANSYS Workbench. The temperature field, stress field distribution and related reasons were obtained during friction process. The temperature and stress of lubricant and matrix were analyzed, and the temperature and stress of lubricant and matrix were analyzed. The influence of different factors (heating temperature, friction heat, hole deformation extrusion pressure) on the driving force of lubricant is discussed. The simulation results show that the heating temperature has gain effect on the driving force, the effect of friction heat should be taken into account after continuous heating, and the friction heat has a significant promoting effect on the driving force of lubricant compared with the heating temperature. However, the effect of pore deformation on extrusion stress is relatively small, and lubricant precipitates to the friction interface under the combined action of heating temperature, frictional thermal-stress and deformation extrusion. Based on the matching and mutual solubility of lubricant and matrix material, the composition design of solid lubricant was carried out by wetting test and empirical formula analysis. The optimum ratio is: 1 / Pb65Sn35 12~18%Ag 0.2~0.3%RE (Y2O3), and the infiltrating composite of matrix and lubricant is realized by high frequency electromagnetic induction infiltration process, and the infiltrated M3/2/TiC system high temperature self-lubricating composite is prepared. The friction and wear properties were investigated on a pin disk high temperature friction and wear tester. The wear surface composition, morphology and structure were analyzed by scanning electron microscope (SEM),) photoelectron spectroscopy (EDXA) and X-ray diffractometer (XRD). The results show that during high temperature friction and wear of the infiltrated high temperature self-lubricating composite, the lubricant precipitates to the friction surface through the micropore channel to form a layer of solid lubricating film containing Pb,Sn,Ag,RE and other elements. On the basis of Pb65Sn35-12Ag lubricant, the lubricating property is improved by adding 0.25 RE.The film forming mechanism of high temperature self-compensation lubricating composite is discussed based on SEM surface morphology analysis.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33

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