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激光微织构表面脂润滑性能试验研究 总被引:1,自引:0,他引:1
采用声光调 Q 二极管泵浦固体光源(DPSS)Nd∶YAG 激光器,在45#钢试样表面进行激光微织构加工,采用 VYKO-NT1100三维形貌分析仪对微观织构形貌进行测量。以二硫化钼润滑脂为润滑剂,在 MMW-1A 型摩擦磨损试验机上进行微织构试样和光滑试样在不同工况条件下的摩擦性能对比试验。试验结果表明,在一定条件下,面积占有率为14%的微凹腔织构表面的脂润滑性能明显优于未织构光滑表面,且随着微凹腔面积占有率的增大,摩擦因数波动范围变小;凹槽织构表面较未织构光滑表面具有更好的润滑稳定性;在脂润滑条件下,激光微织构表面较未织构光滑表面摩擦因数最大可降低26%。 相似文献
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超细氟化石墨的润滑性能研究 总被引:2,自引:2,他引:0
通过四球机考查了润滑添加剂超细氟化石墨在各种不同油中的钢-钢、钢-铜的摩擦学特性,并测试了它的理化性能和应用性能,应用AES能谱对试验件摩擦面进行元素深度剖析,并以其它抗磨极压添加剂(ZDDP、T302和T321)作为对比。结果表明:超细氟化石墨具有优良的润滑性能,将可应用于各种环境中。 相似文献
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电沉积稀土改性陶瓷涂层磨损性能研究 总被引:3,自引:0,他引:3
探讨了在电火花加工机床上沉积碳化钛金属陶瓷涂层方法,利用TiC,WC,Mo,N i粉未添加不同比例稀土元素在高压下压制并烧结了试验电极,在45#钢表面沉积了不同稀土含量的TiC陶瓷涂层,并用扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计、环块式磨损试验机对涂层组成、组织形态进行、硬度及摩擦学性能分别进行了研究,并结合试验结果进行了理论分析。试验结果表明:用电火花放电法可沉积TiC陶瓷涂层,涂层中加入质量分数为0.5%的氧化镧后,涂层的耐磨性能较未加稀土涂层提高了3倍,摩擦因数减少10%,而加入过多的稀土镧氧化物则不利于涂层组织性能及耐磨性能的改善。稀土氧化镧对涂层的组织有改善作用,加入适量的稀土元素使得涂层致密性提高,减少涂层中的缺陷,涂层表面呈多孔结构特性。 相似文献
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混合型轴承摩擦机理的研究 总被引:1,自引:0,他引:1
采用Timken摩擦试验机在空气中,水、润滑油及合成油脂润滑状态下对M50钢、热静等压氮化硅陶瓷轴承元件的摩擦机理进行了研究.对各种参数包括速度、滑动距离和润滑剂进行了比较. 相似文献
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A novel analytical approach for piston ring lubrication solution is presented by taking proper account of mass conservation in the cavitated region (JFO boundary conditions). A system of five nonlinear equations is employed to calculate such parameters as oil film thickness, frictional force, power loss, and oil flow rate. For an enclosed cavitation pattern in piston-ring assembly it was found, that JFO boundary conditions give much better accounting of the estimation of friction force, power loss and flow rate. To show the effectiveness of the undertaken approach, the widely accepted Jeng's approach (Jeng, 1992a) was selected, in which the pressure contribution from the cavitated and the second full film regions, as well as the trailing edge pressure, are ignored. 相似文献
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A novel analytical approach for piston ring lubrication solution is presented by taking proper account of mass conservation in the cavitated region (JFO boundary conditions). A system of five nonlinear equations is employed to calculate such parameters as oil film thickness, frictional force, power loss, and oil flow rate. For an enclosed cavitation pattern in piston-ring assembly it was found, that JFO boundary conditions give much better accounting of the estimation of friction force, power loss and flow rate. To show the effectiveness of the undertaken approach, the widely accepted Jeng's approach (Jeng, 1992a) was selected, in which the pressure contribution from the cavitated and the second full film regions, as well as the trailing edge pressure, are ignored. 相似文献
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Motohiro Kaneta Petr Sperka Peiran Yang Ivan Krupka Ping Yang Martin Hartl 《摩擦学汇刊》2013,56(5):869-879
ABSTRACTThe effect of thermal conductivity on point elastohydrodynamic lubrication (EHL) contacts was discussed with representative engineering ceramics and steel by a non-Newtonian thermal EHL analysis. Through this investigation, fundamentals of EHL characteristics of contact surfaces composed of different thermal conductivities were generally revealed and a combination of optimum ceramic materials has been proposed. Furthermore, when the contacting materials are the same, it has been pointed out that the equivalent elastic modulus should be rather small and the thermal conductivity of the contact material should be high to obtain a thick overall film thickness and low film pressure. 相似文献
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An experimental study of ceramic lubrication by tribopolymerization at high loads and high speeds, using a pin-on-disk (fixed ball-on-flat) machine with alumina-on-alumina, is presented. In order to extend the range of applied loads and sliding velocities beyond those used in previous studies, a three-factor, two-level designed experiment was carried out to determine the effects of monomer structure, load, and speed on wear. Five monomers of widely varying chemical structure were used at one percent concentration in a hydrocarbon carrier fluid, hexadecane. They consisted of (a) one condensation-type monomer, a partial glycol ester of a longchain dimer acid, and (b) four vinyl-type addition monomers. Two levels of load (40 and 160 N) and speed (0.25 and 1.0 m/s) - each varying by a factor of four were used; thus the range of frictional heat generation was 16 to 1. The results of this study were rather surprising and changed our thinking on the mechanism(s) by which monomers can act to reduce ceramic wear. For example, at low speeds — regardless of load — the monomers used were very effective in reducing wear, with reductions ranging from 44 to 98 percent depending on the monomer and load. However, at high speeds, the monomers were generally ineffective; in some cases, increases in wear were observed. This was unexpected. Possible explanations for this behavior — including surface temperature effects and tribochemical reactions — are discussed. Results presented on Fourier Transform Infrared (FTIR) Spectroscopy of worn ceramic surfaces and wear debris show that the film-formation from the monomer solutions is complex, involving a combination of aluminum soap formation as well as evidence of oligomer/polymer formation in some cases, notably diallyl phthalate. 相似文献
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Barry L. Mordike 《摩擦学汇刊》2013,56(1):110-115
This paper deals with recent work applicable to the problems of high-temperature lubrication carried out in the Laboratory of Physics and Chemistry of Solids, University of Cambridge, England. Three main aspects are considered (a) friction of lamellar solids, (b) lubrication from the gas phase (c) frictional properties of hard metals at high temperatures. 相似文献
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The minimizing of friction loss of helical gears is one of today's most important problems. Though helical gears are very widely used in power transmissions of automobiles and ships, basic research on helical gears is comparatively scarce. Under these circumstances, the authors studied the friction loss of helical gears in view of various helix angles, loads, and rotational speeds. Further the relationship between temperature rise of teeth and friction loss was made clear. The results were discussed from the viewpoint of reduction of friction loss and were related to the results of the authors' spur gear tests. Friction loss and temperature rise of helical gear teeth were also investigated while the helix angles were widely varied. All these results, based on experimental investigations, were summarized and general formulas were established in view of gear design. 相似文献
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