本文選題：聚脲潤滑脂 + 碳基納米材料��； 參考：《廣東工業(yè)大學(xué)》2015年碩士論文

【摘要】：機(jī)械設(shè)備運(yùn)轉(zhuǎn)中潤滑脂是減少機(jī)件軸承磨損和延長機(jī)械壽命的重要潤滑劑。其中,聚脲潤滑脂具有一系列優(yōu)良性能,如抗腐蝕性能、長的使用壽命和適用性強(qiáng)等特點(diǎn),是一種潛力巨大和良好發(fā)展前景的潤滑材料。為了提高聚脲潤滑脂性能和拓展其應(yīng)用,可以在潤滑脂中添加合適的添加劑。目前碳基納米材料在潤滑脂中潤滑效果研究鮮見報(bào)道,以碳基納米材料作為潤滑脂新一代添加劑,擁有廣闊的應(yīng)用前景。為此本文將兩種碳基納米材料添加于聚脲潤滑脂中,對碳基納米材料在潤滑脂中的熱穩(wěn)定性能、潤滑性能及抗靜電性進(jìn)行了系統(tǒng)研究。本文主要研究內(nèi)容如下：1.以多壁碳納米管、石墨烯為添加劑,合成聚脲潤滑脂。利用滴點(diǎn)測定儀、熱重分析儀和導(dǎo)熱系數(shù)測定儀研究了聚脲潤滑脂的熱穩(wěn)定性能。發(fā)現(xiàn)兩種碳基材料加入聚脲潤滑脂中,對潤滑脂的滴點(diǎn)沒有明顯的影響,但明顯提高了潤滑脂的熱分解溫度,其中以多壁碳納米管為添加劑的潤滑脂熱穩(wěn)定性優(yōu)于以石墨烯潤滑脂。導(dǎo)熱系數(shù)測定表明兩種碳基納米材料均提高了潤滑脂的導(dǎo)熱系數(shù)。2.采用了摩擦磨損試驗(yàn)儀和四球機(jī)全面考察了兩種碳基納米材料在潤滑脂中高低負(fù)載和不同摩擦副下的減摩性能,并觀察其磨斑形貌。其中在低負(fù)載下兩種碳基納米材料較高的摩擦系數(shù)表明不太適合在低負(fù)載摩擦下情況使用。在不同聚合物作為摩擦副的測試中,石墨烯的減磨效果優(yōu)于碳納米管,平均摩擦系數(shù)都比碳納米管的要低。高負(fù)載下兩種碳基納米材料表現(xiàn)出優(yōu)異的潤滑性能,其中可能是因?yàn)槭┰谀Σ吝^程中吸附在受力的鋼球表面,形成物理沉積膜。3.考察了含碳基納米材料潤滑涂層在工業(yè)上的應(yīng)用。采用了表面電阻測試儀考察含碳基納米材料在潤滑涂層的抗靜電效果。結(jié)果表明均改善了聚脲潤滑脂在聚合物材料表面潤滑過程的抗靜電性能。并且比對了市售潤滑脂的潤滑性能,結(jié)果表明都已達(dá)到常用市售潤滑脂的潤滑性能,并且含石墨烯脲基潤滑脂的潤滑性能比市售潤滑脂更好。
[Abstract]:Grease is an important lubricant to reduce bearing wear and prolong mechanical life. Polyurea grease has a series of excellent properties, such as corrosion resistance, long service life and strong applicability. It is a kind of lubricating material with great potential and good development prospect. In order to improve the performance of polyurea grease and expand its application, suitable additives can be added to the grease. At present, there are few reports on the lubricating effect of carbon based nano-materials in lubricating greases. Carbon based nano-materials as a new generation of grease additives have a broad application prospect. In this paper, two kinds of carbon based nano-materials were added to polyurea grease. The thermal stability, lubricating property and antistatic property of carbon based nano-materials in grease were studied systematically. The main contents of this paper are as follows: 1. Polyurea grease was synthesized with multi-wall carbon nanotubes and graphene as additives. The thermal stability of polyurea grease was studied by using drop point tester, thermogravimetric analyzer and thermal conductivity tester. It was found that the addition of two kinds of carbon based materials into polyurea grease had no obvious effect on the dropping point of grease, but significantly increased the thermal decomposition temperature of grease. The thermal stability of lubricating grease with multi-wall carbon nanotubes as additive is better than that with graphene grease. The measurement of thermal conductivity shows that the thermal conductivity of lubricating greases is increased by two kinds of carbon based nano-materials. Friction and wear tester and four-ball machine were used to investigate the antifriction properties of two kinds of carbon based nano-materials under high and low loads in grease and different friction pairs, and the morphology of wear spot was observed. The high friction coefficient of the two carbon based nanomaterials under low load shows that they are not suitable for use under low load friction. In the test of different polymers as friction pairs, the wear reduction effect of graphene is better than that of carbon nanotubes, and the average friction coefficient of graphene is lower than that of carbon nanotubes. The two carbon based nanomaterials exhibit excellent lubricating properties under high load, which may be due to the adsorption of graphene on the surface of the steel ball during friction and the formation of a physical deposition film .3. The industrial application of lubricating coatings of carbon-containing nano-materials was investigated. The antistatic effect of carbon-based nano-materials on lubricating coatings was investigated by surface resistance tester. The results show that the antistatic properties of polyurea grease on the surface of polymer are improved. The results show that the lubricating properties of commercial greases containing graphene urease grease are better than that of commercial greases.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE624.83;TB383.1

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本文編號(hào)：1978371