摩擦副润滑状态可靠性的计算

本文是重新估计润滑状态的一种新的探讨——利用铁谱技术对摩擦界面间存在的磨柱进行观察分析。论证了磨粒对润滑状态的影响及其统计的尺寸分布规律。进而提出润滑状态可靠性的计算方法。     

基于不同摩擦副条件下的边界润滑抗磨效果研究

通过不同实验对比，从磨损角度出发分析了不同条件下零件表面的边界润滑状况，提出了选用适当的热处理工艺，恰当的摩擦副接触类型及高性能的润滑液，可明显改善边界润滑效果，提高材料的耐磨性。     

水润滑橡胶/镀镍钢配副摩擦磨损机理研究

对水润滑轴承专用橡胶／镀镍钢配副分别在干摩擦、边界润滑条件下用数显式高速环块摩擦磨损试验机进行了摩擦磨损试验，并借助SEM分析了其摩擦磨损机理。结果表明：千摩擦条件下主要为粘着磨损，边界润滑条件下主要为磨粒磨损。     

气体动压润滑轴承摩擦副材料的选择

论述了气动轴承的应用概况及其摩擦材料应具备的性质，在此基础上提出了多种适用于气动压润滑轴承的材料。     

钢蜗轮传动的润滑机理

本文通过用于钢蜗轮传动的高效极压润滑油的研制，及钢蜗轮传动的实验研究，系统地论述了钢锅轮传动处于边界润滑状态，在实现钢蜗轮传动的基础上，用边界润滑理论阐述了钢蜗轮传动的润滑机理。     

直链脂肪酸与直链脂肪醇混合对钢—钢和钢—铝摩擦副摩擦磨损性能的影响研究

本文利用四球摩擦磨损试验机和SRV摩擦磨损试验机研究了直链脂肪酸和直链脂肪醇以及其混合物对钢－钢、钢－铝摩擦副的摩擦磨损性能的影响。结果表明,对钢－钢和钢－铝摩擦副的润滑,直链脂肪酸和直链脂肪醇混合物的抗磨性能要优于单独的直链脂肪酸和直链脂肪醇的抗磨性能。     

钢蜗轮传动齿面润滑的理论与实践

本文分析研究了钢蜗轮副的齿面润滑机理,并进行了润滑剂对钢蜗轮传动性能影响的试验研究.结果表明齿面润滑是实现钢蜗轮传动的关键技术之一,且齿面润滑对钢蜗轮传动性能影响很大.为钢蜗轮传动的推广与应用提供了可靠的依据.     

羟基硅酸铝润滑油添加剂对钢/铸铁摩擦副磨损性能的影响

采用球盘试验和销盘试验相结合的方法,研究了钢/铸铁摩擦副在不同油润滑条件下磨损性能的变化,考察了不同含量羟基硅酸铝添加剂的作用效果,采用扫描电镜、X射线衍射仪以及纳米压痕仪对试验样品进行了分析测试。结果表明,该金属陶瓷添加剂表现出显著的抗磨性能,提高了钢/铸铁摩擦副承载能力和使用寿命;随着添加剂含量的增加,抗磨作用更加明显,负磨损现象开始出现;该添加剂可以抑制凹坑和裂纹的扩展,从而使摩擦表面形貌得到改善,并通过改变摩擦表面层的结构使摩擦副的磨损性能得到显著提高。     

润滑油添加剂摩擦性能对比试验研究

本文研究了在一定载荷条件下，两种润滑油添加剂对软齿面材质和硬齿面材质的摩擦磨损性能的影响。结果表明，复合添加剂的加入能明显降低试样的摩擦系数和体积磨损量，提高其减磨性能，显著降低摩擦面的油温，而提高润滑油的使用寿命。     

如何根据摩擦副材质来选择润滑剂

在润滑剂研制与选择中,发现有时存在下述现象,高油膜强度润滑剂不如低油膜强度的润滑效果好,较低摩擦系数润滑剂不如较高摩擦系数的润滑效果好,以油膜强度和摩擦系数衡量润滑性似乎无真正价值。油膜强度和摩擦系数是评价润滑剂润滑性的两个重要和常用指标,但只有根据...     

有机硼酸酯添加剂对摩擦副抗咬死性能影响研究

通过对稀土金属硼系列有机硼酸酯（Ｃ９Ｈ２１ＢＯ３）添加剂的润滑性能抗咬死性能试验研究,发现有机硼酸酯添加剂能显著改善滑动摩擦副的抗咬死性能及润滑油的润滑性能,通过分析磨斑表面Ｘ射线衍射图谱（ＸＰＳ）,发现该种添加剂作用下,摩擦副表面形成了聚合物膜,使得摩擦力减小了,随着载荷的增大,添加剂在摩擦热产生的高温作用下,部分原子如Ｃ、Ｂ同表面金属发生化学反应,生成了ＦｅＣ,Ｂ２Ｏ３,Ｈ３ＢＯ３等物质。结合     

用齿轮油润滑实现钢蜗杆副传动的试验研究

用齿轮油作润滑剂以实现钢蜗杆副传动为目的,分别对用齿轮油润滑下的钢蜗杆副传动和用铜蜗轮油润滑下的铜蜗杆副传动的传动性能进行了试验研究。结果表明用齿轮油可以实现钢蜗杆副传动的润滑要求。为钢蜗杆副传动的推广与应用提供了可靠的依据。     

润滑油添加剂对聚合物材料摩擦磨损性能的影响研究

利用MM－200型磨损试验机考察了ZDDP对聚合物材料（PTFE、PI及MCPA）－GCr15轴承钢摩擦副摩擦磨损性能的影响。研究发现,液体石蜡及含ZDDP的液体石蜡润滑均可大幅度改善聚合物材料的摩擦磨损性能,且使其摩擦系数比干摩擦时降低一个数量级,摩擦副表面的ZDDP吸附膜均在不同程度上提高聚合物材料的耐磨性,但其对聚合物材料的摩擦性能影响不大。     

润滑油对滑动摩擦副咬死性能的影响

在ＭＨＫ－５００型环块磨损试验机上对Ｎ４６＃机械油在不同供同温度下由４５＃淬火试环、试块组成的滑动摩擦副进行了抗咬死性能试验研究。试验结果表明：供油温度对摩擦副的抗咬死性能有较大的影响，在一定的范围内提高润滑油的供油温度有利于提高摩擦副的抗咬死能力。试验还发现：随着润滑油中磨粒的增多，摩擦副咬死极限载荷逐渐下降，且摩擦副失效后表面温度表现出不确定性。润滑同中磨粒状况对摩擦副咬死影响不可忽视。对摩擦     

An Investigation of Hydraulic Motor Efficiency and Tribological Surface Properties

Hydraulic motor efficiency does not depend upon viscosity alone. Under low-speed, high-torque conditions, hydraulic motors operate in the boundary regime and, therefore, surface interactions of lubricant additives can affect friction and efficiency. This article presents an investigation of boundary film formation, friction, and surface topography in benchtop tribometers and hydraulic motors. Fluids investigated included those with varied antiwear packages (zinc dialkyldithiophosphate [ZDDP], ashless) and friction modifiers (with and without) and base oil (Group I, Group III). The mechanical efficiencies of geroler, axial piston, bent-axis, and radial piston motors were measured under low-speed, high-torque conditions. The addition of a friction modifier to an ashless hydraulic fluid increased the efficiency of the motors at low speed. Energy-dispersive X-ray spectroscopy (EDX) analysis of motor surfaces after testing revealed the presence of tribochemical films from the hydraulic fluid additives. In benchtop tribometer testing, the friction modifier reduced friction significantly but also increased wear. This could be related to surface competition of the friction modifier and antiwear chemistries, as evidenced by the reduced concentration of phosphorus on the surface. These findings are significant because they provide insights toward the development of fluids that can enhance motor efficiency but also demonstrates the need for a well-balanced additive package so that improved motor efficiency can be achieved without affecting other important properties of the fluid.     

Temperature Analysis in Lubricated Simple Sliding Rough Contacts

A temperature analysis of dry sliding fully plastic contact is extended to calculate the asperity temperatures between a sliding lubricated rigid smooth plane and a stationary elastic rough surface. First, surface roughness is generated numerically to have a Gaussian height distribution and a bilinear autocorrelation function. Lai and Cheng's elastic rough contact computer program is then used to determine the asperity contact loads and geometries of real contact areas. Assuming different frictional coefficients for shearing the lubricant film at the noncontact areas, shearing the surface film at the asperity contacts and shearing the oxide film as the asperity temperature exceeds a critical temperature, asperity temperature distributions can be calculated. Eight cases in Durkee and Cheng's scuffing tests of lubricated simple sliding rough contacts are simulated by using 20 computer-generated rough surfaces. The results show that scuffing is correlated to high-temperature asperities which are above the material-softening temperature.     

Adhesion of Rare Earth Metals

Results of adhesion tests performed on yttrium (Y), as well as four rare earth metals, samarium (Sm), gadolinium (Gd), dysprosium (Dy), and holmium (Ho), are reported. A modification of the twist-compression bonding method was used to obtain the coefficients of adhesion. Low adhesion values for the above metals were obtained as expected on the basis of the crystal structure considerations. A proposal is made to apply the atomic “size-factor” criterion to the prediction of adhesion properties of dissimilar metals. An illustration of the method is given in terms of adhesion of iron to the above mentioned metals.     

润滑油中磨屑尺寸对滑动摩擦副咬死性能影响的试验研究

在ＭＨＫ－５００型环块式磨损试验机上,对含不同尺寸磨屑润滑油润滑的４５＾＃淬火屑试环,试块组成的滑动摩擦副进行了抗咬死性能试验研究,试验结果表明,润滑油中磨屑尺寸对滑劝摩擦副抗咬伤性能有很大的影响,改善润滑油清洁度的显著提高摩擦副的抗咬死承载能力,滑动摩擦副的抗咬死能力随润滑油中磨屑含量的增中减小很快,观察咬死后试件上的磨痕,表明滑动摩擦副的咬死是由于局部高温引起的接触区熔焊所致。     

Effect of Extreme Pressure Additives on the Deformation Behavior of Oxide Scale during the Hot Rolling of Ferritic Stainless Steel Strips

High-speed steel (HSS) materials are universally used as work rolls for the hot rolling of stainless steels. Their use has increased the output of the rolling mill and decreased roll material consumption and grinding. Sticking defects often occur, however, during the hot rolling process. In this article, extreme pressure (EP) additives were dropped on the HSS samples at high temperature. Zinc dialkyl dithiophosphate (ZDDP) was chosen as the most effective EP additive by scratch tests on the HSS samples. In order to determine the optimum proportion of ZDDP in the lubricant, two reduction rates were tested on a Hille 100 experimental rolling mill by hot rolling ferritic stainless steel 445J1M at five different concentrations of ZDDP. The mechanism of EP additive action during the hot rolling process was also investigated. By analyzing the deformation behavior of the oxide scale of samples after hot rolling using different proportions of ZDDP, it was found that 20% ZDDP in the lubricant is the preferred concentration for industrial application.     

用新型摩擦装置测定薄板成形的摩擦系数

采用一种新型的测量板成形中工具与工件之间摩擦系数的模拟装置,试验测定了不同厚度及成分的钢板在不同条件下的摩擦系数。被测钢板有08Al,IF钢,IF钢镀锌板,测试中改变润滑条件,辊距、辊径和板厚,板表面取向。结果表明摩擦系数与润滑和冲头的几何形状密切相关。