本文選題：類水滑石 + 減摩抗磨�。� 參考：《中國地質(zhì)大學(xué)(北京)》2015年博士論文

【摘要】：類水滑石作為應(yīng)用廣泛,環(huán)境友好的層狀礦物,本課題組前期的研究已驗證了其優(yōu)良的減摩抗磨性能。但其作為潤滑油減摩抗磨自修復(fù)添加材料的研究剛剛起步,目前的研究大多集中在摩擦學(xué)性能的簡單評價�；谝陨显�,本文開展了微-納米類水滑石的制備、插層改性、熱處理和摩擦學(xué)性能評價,采用多種表面分析手段對摩擦磨損表面的形貌和化學(xué)環(huán)境進行了表征,分析了類水滑石與摩擦副表面及復(fù)配添加劑的作用過程、減摩抗磨和成膜機理、晶體在摩擦作用下的變化,對類水滑石在摩擦學(xué)領(lǐng)域的系統(tǒng)深入研究將為其工業(yè)化和產(chǎn)品化提供重要的理論和技術(shù)支持。本文制備了Ni-Al、Mg-Al和Co-Al類水滑石及其有機插層改性粉體,得到了優(yōu)化的制備和改性條件。通過四球摩擦實驗機、齒輪摩擦實驗機和高頻微動摩擦實驗機評價了其作為潤滑油基礎(chǔ)油和商用潤滑油添加材料的減摩抗磨性能。采用掃描電子顯微鏡、原子力顯微鏡、X射線能譜分析和X射線近邊吸收譜分析對摩擦表面進行了表征,結(jié)合摩擦學(xué)數(shù)據(jù)得出了類水滑石對潤滑油摩擦學(xué)性能改善的作用機理。研究結(jié)果表明:Ni-Al、Mg-Al和Co-Al類水滑石微-納米粉體均能有效提高基礎(chǔ)油的減摩抗磨性能;Mg-Al類水滑石的熱處理能夠提高粉體的減摩性能,但在添加量不變的情況,會減弱粉體的抗磨損性能;添加Co-Al類水滑石能使基礎(chǔ)油的摩擦系數(shù)降低19%-22.3%,摩擦副的磨斑直徑減小33%。摩擦表面形貌分析表明,摩擦作用過程中水滑石顆�？梢晕皆谀Σ粮北砻�,防止相對運動摩擦表面的直接接觸,降低摩擦系數(shù)、磨損量、摩損表面粗糙度、磨痕密度和深度。類水滑石的加入還可有效防止基礎(chǔ)油的氧化,消除硫酸鹽對鋼副表面的腐蝕。類水滑石在摩擦作用后結(jié)構(gòu)發(fā)生變化,晶體顆粒的有序度降低,Al的部分配位環(huán)境由八面體變?yōu)樗拿骟w,這是降低摩擦系數(shù)的因素之一。類水滑石與二烷基二硫代磷酸鋅(ZDDP)復(fù)配使用時,在成膜過程中兩者存在競爭作用,使得ZDDP摩擦膜中形成短鏈多磷酸鹽,同時會使摩擦膜近表面的硫化物氧化,增大了含復(fù)配劑樣品的摩擦系數(shù)。Co-Al類水滑石與ZDDP長時間復(fù)配使用時,類水滑石會使摩擦膜內(nèi)產(chǎn)生Fe S,表明類水滑石的添加可以提高ZDDP的極壓性能。
[Abstract]:Hydrotalcite is a widely used and environmentally friendly layered mineral, and its excellent antifriction and antiwear properties have been verified by our previous research. However, the research on the antifriction and antiwear self-repairing additive of lubricating oil is just beginning, and most of the current researches focus on the simple evaluation of tribological properties. For the above reasons, the preparation, intercalation modification, heat treatment and tribological performance evaluation of micro-nano hydrotalcite were carried out. The morphology and chemical environment of friction and wear surfaces were characterized by various surface analysis methods. The process of action of hydrotalcite with the surface of friction pair and the compound additive, the mechanism of antifriction and film formation, and the change of crystal under friction are analyzed. The systematic study of hydrotalcite in tribology will provide important theoretical and technical support for its industrialization and production. Ni-Al Mg-Al and Co-Al hydrotalcite and their organic intercalation modified powders were prepared in this paper. The optimized preparation and modification conditions were obtained. The friction and antiwear properties of four ball friction tester, gear friction tester and high frequency micro dynamic friction tester were evaluated as lubricating base oil and commercial lubricating oil additive materials. The friction surface was characterized by scanning electron microscope (SEM), atomic force microscope (AFM) X-ray spectrum analysis and X-ray near-edge absorption spectrum analysis. Combined with tribological data, the mechanism of improving the tribological properties of lubricating oil by hydrotalcite was obtained. The results show that the friction and antiwear properties of the base oil can be improved effectively by both the micro and nano powders of water talcite such as: Ni-Al Mg-Al and Co-Al hydrotalcite. The heat treatment of Mg-Al hydrotalcite can improve the friction-reducing performance of the powder, but when the amount of the powder is constant, the friction and antiwear properties of the base oil can be improved. Addition of Co-Al hydrotalcite can reduce the friction coefficient of base oil by 19% -22.3and reduce the diameter of wear spot of friction pair by 33%. The surface morphology analysis shows that the water talc particles can be adsorbed on the surface of the friction pair during the friction process to prevent the direct contact of the relative moving friction surface and to reduce the friction coefficient, wear amount, surface roughness, abrasion density and depth. The addition of hydrotalcite can also effectively prevent the oxidation of base oil and eliminate the corrosion of steel secondary surface caused by sulphate. The structure of hydrotalcite changes after friction, and the order degree of crystal particles decreases from octahedron to tetrahedron, which is one of the factors that decrease the friction coefficient. When the hydrotalcite is combined with zinc dialkyldithiophosphate (ZDDP), there is competition between the two in the process of forming the film, which results in the formation of short chain polyphosphate in the ZDDP friction film and the oxidation of sulfide near the surface of the friction film. The friction coefficient of the sample containing the admixture. Co-Al hydrotalcite and ZDDP were increased for a long time, the hydrotalcite-like material produced Fe S in the friction film, which indicated that the addition of hydrotalcite-like material could improve the extreme pressure performance of ZDDP.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TB39

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