旱区植物油作润滑油的摩擦学性能及磨损数据分析
发布时间：2018-08-20 15:50
【摘要】：伴随环境破坏的日益严重和矿物燃料的减少,能源问题亟待解决。在很多领域,矿物油被绿色润滑油替代已经成为一种趋势。寻找具有更好的润滑性能和抗氧化性能的植物油是目前研究的工作热点,而关于耐旱植物的种子油还很少有人研究。本文选择4种旱区作物作为研究对象,探讨旱区植物油的润滑性能。本文通过超临界CO2萃取技术提取植物油,通过MFTR-4000高速往复摩擦磨损试验仪分析植物油(沙棘、柠条、荷荷巴、芦荟)作为润滑基础油在钢/钢、钢/铜、钢/铝摩擦副上的摩擦磨损性能。采用光学显微镜(LV150N)观察其表面磨斑形貌,利用热失重分析仪(TGA-DSC)考察了其热稳定性,通过ANSYS有限元分析进行模拟仿真。试验结果表明:1、利用CO2萃取技术提取植物油;利用热失重分析仪(TGA-DSC)分析可得:4种植物油的起始分解温度均较高,说明其结构稳定性非常好,在高温下仍能保持良好的润滑性能,能满足润滑油使用工况的要求。2、沙棘油(SBO)、柠条油、荷荷巴油(JO)、芦荟油作为润滑油基础油均具有一定的润滑性能,在植物油中加入添加剂:二烷基二硫代氨基甲酸钼(MoDTC)、二烷基二硫代磷酸锌(ZnDTP)、及二者复配,可以有效的改善其摩擦磨损性能。在钢/钢摩擦副上,柠条中添加剂的减摩抗磨效果最优异;在钢/铜摩擦副上,柠条油和芦荟油中添加剂的加入均使摩擦系数减幅达到40%以上,减摩性能优异。在钢/铝摩擦副上,添加剂的加入对于基础油减摩抗磨性能的改变没有明显的规律性。3、对试块表面磨斑分析可得:在以沙棘油为基础油的润滑体系中,不同的添加剂对其抗磨性能的改善也不同;在以柠条为基础油的润滑体系中,钢/铝摩擦副下,MoDTC和ZnDTP起拮抗作用,使磨痕宽度和犁沟数量增加;在以荷荷巴为基础油的润滑体系中,3种添加剂在钢/铜摩擦副上的抗磨性能均较差,说明荷荷巴油不适用于钢/铜摩擦副的设备上;在以芦荟油为基础油的润滑体系中,复配添加剂在钢/钢摩擦副上起拮抗作用,抗磨性能降低,在其余摩擦副上起协同作用,抗磨性能均有一定的改善。4、利用ANSYS有限元分析软件,研究了磨损体积与磨损时间的变化关系,仿真分析了磨损表面的应力及应变的变化,并通过公式建立了磨损体积的分析模型,预测结果显示了较为理想的效果,对生产实践有指导意义。
[Abstract]:With the increasingly serious environmental damage and the reduction of fossil fuels, energy problems need to be solved. In many areas, mineral oil has become a trend to be replaced by green lubricating oil. The search for vegetable oils with better lubricating and antioxidant properties is a hot research topic at present, but few researches have been done on the seed oils of drought-tolerant plants. In this paper, four kinds of crops in arid area were selected as the research object to study the lubricating properties of vegetable oil in arid area. In this paper, vegetable oil was extracted by supercritical CO2 extraction technique, and vegetable oil (Hippophae rhamnoides, Caragana korshinskii, jojoba, aloe) was used as lubricating base oil in steel / steel, steel / copper by MFTR-4000 high speed reciprocating friction and wear tester. Friction and wear properties of steel / aluminum friction pairs. Optical microscope (LV150N) and thermogravimetric analyzer (TGA-DSC) were used to observe the morphology of the surface and the thermal stability was investigated. The simulation was carried out by ANSYS finite element analysis. The experimental results showed that CO2 extraction technique was used to extract vegetable oil, and TGA-DSC analysis showed that the initial decomposition temperature of the four kinds of vegetable oils was higher, which indicated that the structure stability was very good and the lubricity could be maintained at high temperature. (SBO), Caragana oil and (JO), aloe oil as lube base oil all have certain lubricating properties. Adding additive: molybdenum dialkyldithiocarbamate (MoDTC), zinc dialkyl dithiophosphate (ZnDTP),) and the combination of them can effectively improve the friction and wear properties of vegetable oil. On the steel / steel friction pair, the additive in Caragana korshinskii has the best antiwear effect, and the additive in Caragana oil and aloe oil can reduce the friction coefficient by more than 40%, and the friction performance is excellent. On the steel / aluminum friction pair, the addition of additive has no obvious regularity for the change of friction and antiwear performance of base oil. It can be found that in the lubricating system with seabuckthorn oil as the base oil, the wear spot on the surface of the test block can be analyzed. In the lubricating system of Caragana korshinskii base oil, MoDTC and ZnDTP of steel / aluminum friction pairs play an antagonistic role, which increase the wear mark width and the number of ploughs. In the lubricating system with jojoba as the base oil, the antiwear properties of the three additives on the steel / copper friction pair are all poor, which indicates that the jojoba oil is not suitable for the equipment of the steel / copper friction pair, and in the lubricating system with aloe oil as the base oil, The compound additive has antagonistic effect on steel / steel friction pair, and its anti-wear property is decreased, and synergistic action is taken on the other friction pairs, and the anti-wear performance is improved to a certain extent. ANSYS finite element analysis software is used. The relationship between wear volume and wear time is studied. The variation of stress and strain on wear surface is simulated and the analysis model of wear volume is established by formula. It has guiding significance to production practice.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.22
[Abstract]:With the increasingly serious environmental damage and the reduction of fossil fuels, energy problems need to be solved. In many areas, mineral oil has become a trend to be replaced by green lubricating oil. The search for vegetable oils with better lubricating and antioxidant properties is a hot research topic at present, but few researches have been done on the seed oils of drought-tolerant plants. In this paper, four kinds of crops in arid area were selected as the research object to study the lubricating properties of vegetable oil in arid area. In this paper, vegetable oil was extracted by supercritical CO2 extraction technique, and vegetable oil (Hippophae rhamnoides, Caragana korshinskii, jojoba, aloe) was used as lubricating base oil in steel / steel, steel / copper by MFTR-4000 high speed reciprocating friction and wear tester. Friction and wear properties of steel / aluminum friction pairs. Optical microscope (LV150N) and thermogravimetric analyzer (TGA-DSC) were used to observe the morphology of the surface and the thermal stability was investigated. The simulation was carried out by ANSYS finite element analysis. The experimental results showed that CO2 extraction technique was used to extract vegetable oil, and TGA-DSC analysis showed that the initial decomposition temperature of the four kinds of vegetable oils was higher, which indicated that the structure stability was very good and the lubricity could be maintained at high temperature. (SBO), Caragana oil and (JO), aloe oil as lube base oil all have certain lubricating properties. Adding additive: molybdenum dialkyldithiocarbamate (MoDTC), zinc dialkyl dithiophosphate (ZnDTP),) and the combination of them can effectively improve the friction and wear properties of vegetable oil. On the steel / steel friction pair, the additive in Caragana korshinskii has the best antiwear effect, and the additive in Caragana oil and aloe oil can reduce the friction coefficient by more than 40%, and the friction performance is excellent. On the steel / aluminum friction pair, the addition of additive has no obvious regularity for the change of friction and antiwear performance of base oil. It can be found that in the lubricating system with seabuckthorn oil as the base oil, the wear spot on the surface of the test block can be analyzed. In the lubricating system of Caragana korshinskii base oil, MoDTC and ZnDTP of steel / aluminum friction pairs play an antagonistic role, which increase the wear mark width and the number of ploughs. In the lubricating system with jojoba as the base oil, the antiwear properties of the three additives on the steel / copper friction pair are all poor, which indicates that the jojoba oil is not suitable for the equipment of the steel / copper friction pair, and in the lubricating system with aloe oil as the base oil, The compound additive has antagonistic effect on steel / steel friction pair, and its anti-wear property is decreased, and synergistic action is taken on the other friction pairs, and the anti-wear performance is improved to a certain extent. ANSYS finite element analysis software is used. The relationship between wear volume and wear time is studied. The variation of stress and strain on wear surface is simulated and the analysis model of wear volume is established by formula. It has guiding significance to production practice.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.22
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