本文選題：多孔聚合物　切入點(diǎn)：自潤(rùn)滑　出處：《東北石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：多孔聚合物基自潤(rùn)滑復(fù)合材料自身具備多孔結(jié)構(gòu)或多孔載體,潤(rùn)滑油或潤(rùn)滑脂可以貯存在這些孔道或載體中。摩擦?xí)r,由于摩擦熱和載荷的耦合作用,潤(rùn)滑油脂持續(xù)且穩(wěn)定地析出,在摩擦表面形成穩(wěn)定的潤(rùn)滑油膜,起到減摩耐磨作用,具有廣闊的應(yīng)用前景。本文制備了多孔聚合物基自潤(rùn)滑復(fù)合材料,研究了造孔劑含量或潤(rùn)滑添加劑對(duì)復(fù)合材料摩擦學(xué)性能的影響,結(jié)合掃描電子顯微鏡(SEM)對(duì)復(fù)合材料內(nèi)部結(jié)構(gòu)、磨損面及對(duì)偶面等進(jìn)行多角度觀察和分析,討論了相關(guān)摩擦磨損機(jī)理。同時(shí),借助有限元分析,進(jìn)一步揭示多孔自潤(rùn)滑復(fù)合材料的孔隙結(jié)構(gòu)及孔隙率與摩擦磨損性能之間的內(nèi)在規(guī)律以及摩損面上自潤(rùn)滑膜的成膜機(jī)理。論文的主要研究?jī)?nèi)容和結(jié)論可歸納如下:1.選用聚醚醚酮(PEEK)為基體材料,NaCl為造孔劑,鋰基潤(rùn)滑脂為潤(rùn)滑劑,采用模壓濾取、真空熔漬方法制備了多孔聚醚醚酮(PEEK)基自潤(rùn)滑復(fù)合材料。首先,通過摩擦實(shí)驗(yàn),考察了造孔劑含量對(duì)多孔PEEK復(fù)合材料內(nèi)部結(jié)構(gòu)與摩擦磨損性能的影響。其次,根據(jù)PEEK復(fù)合材料在持續(xù)旋轉(zhuǎn)雙環(huán)摩擦運(yùn)動(dòng)中摩擦熱及應(yīng)力變化特點(diǎn),結(jié)合材料SEM分析,建立二維幾何軸對(duì)稱模型。最后,通過數(shù)值分析,考察了材料在溫度場(chǎng)與應(yīng)力場(chǎng)的性能特征,分析了孔隙率對(duì)多孔PEEK基復(fù)合材料的溫度、位移及應(yīng)力分布情況的影響。結(jié)果表明,模擬結(jié)果與實(shí)測(cè)值的最大誤差小于7%。該研究有助于指導(dǎo)多孔PEEK基自潤(rùn)滑復(fù)合材料的制備及摩擦學(xué)性能的研究。2.以聚苯硫醚(PPS)為基體材料制備了多孔聚苯硫醚(PPS)基自潤(rùn)滑復(fù)合材料。實(shí)驗(yàn)結(jié)果表明,NaCl含量為30wt.%,孔隙率為21%時(shí),多孔PPS復(fù)合材料的摩擦系數(shù)、磨損率及接觸表面溫度為最小值,分別為0.026、3.75×10-16m3(Nm)-1及44.3℃。與純PPS相比,其摩擦系數(shù)減小90%,耐磨性能增強(qiáng)1.3×104倍。根據(jù)多孔材料微觀形貌,建立二維等效體積單元模型,設(shè)計(jì)結(jié)構(gòu)參數(shù)λ進(jìn)行孔隙率計(jì)算。仿真復(fù)合材料摩擦運(yùn)動(dòng),采用熱-應(yīng)力耦合場(chǎng)分析方法,考察了摩擦過程中材料的溫度及應(yīng)力分布云圖。同時(shí),分析了材料的孔結(jié)構(gòu)及孔隙率對(duì)潤(rùn)滑脂的析出速率的影響,揭示了多孔PPS自潤(rùn)滑材料的自潤(rùn)滑機(jī)理。3.采用真空浸漬-濾洗方法制備了含油活性炭粉末(ACs-oil),然后將ACs-oil均勻地添加到環(huán)氧樹脂中,制備了環(huán)氧樹脂基自潤(rùn)滑復(fù)合材料(ACs-oil/EP)。考察了不同ACs-oil含量對(duì)ACs-oil/EP自潤(rùn)滑復(fù)合材料的摩擦學(xué)性能的影響。實(shí)驗(yàn)結(jié)果表明,摩擦條件為1MPa、0.52m/s,ACs-oil含量為10wt.%,復(fù)合材料摩擦系數(shù)與磨損率分別為0.47與11.5×10-14m3(Nm)-1。與純環(huán)氧相比,摩擦系數(shù)降低26%,耐磨損性提高3.21倍。結(jié)合SEM和EDS分析斷面、磨損面與對(duì)偶面微觀形貌,討論了ACs-oil/EP自潤(rùn)滑材料的自潤(rùn)滑機(jī)理。
[Abstract]:Porous polymer based self-lubricating composites have porous structures or porous carriers, and lubricating oil or grease can be stored in these channels or carriers. The lubricating oil precipitates continuously and stably, and forms a stable lubricating oil film on the friction surface, which has the function of reducing friction and wear resistance, and has broad application prospects. In this paper, porous polymer based self-lubricating composites were prepared. The effect of the content of pore-making agent or lubricating additive on the tribological properties of the composite was studied. The internal structure, wear surface and dual surface of the composite were observed and analyzed from different angles combined with the scanning electron microscope (SEM). The related friction and wear mechanism is discussed. At the same time, with the help of finite element analysis, The internal rules between pore structure, porosity and friction and wear properties of porous self-lubricating composites and the film forming mechanism of self-lubricating film on friction surface are further revealed. The main contents and conclusions of this paper can be summarized as follows. Using polyether ether ketone (PEEK) as matrix material and NaCl as pore-forming agent, The porous polyether ether ketone peek (PEEK) based self-lubricating composite was prepared by the method of molding filtration and vacuum melting with lithium grease as lubricant. The effects of pore-forming agent content on the internal structure and friction and wear properties of porous PEEK composites were investigated. Secondly, according to the characteristics of friction heat and stress of PEEK composites during the continuous rotating double-ring friction movement, the SEM analysis was carried out. A two-dimensional geometric axisymmetric model was established. Finally, through numerical analysis, the properties of the material in the temperature field and stress field were investigated, and the temperature of porous PEEK matrix composites was analyzed. The effect of displacement and stress distribution. The results show that, The maximum error between the simulated results and the measured values is less than 7. This study is helpful to guide the preparation and tribological properties of porous PEEK matrix composites .2.The porous polyphenylene sulfide (PPS) based composites were prepared by using polyphenylene sulfide (PPS) as matrix material. Self-lubricating composites. The experimental results show that when the NaCl content is 30 wt. and the porosity is 21, The friction coefficient, wear rate and contact surface temperature of porous PPS composites are the minimum values of 0.026 ~ 3.75 脳 10 ~ (-16) m ~ (-3) Nm ~ (-1) and 44.3 鈩，

本文編號(hào)：1627351