固体润滑滑动轴承的研究

作者介绍了固体润滑滑动轴承国内外的研究动态、润滑机理、选用这类轴承的基本原则以及对开展镶嵌型固体润滑滑动轴承研究的设想。     

二硫化钼固体润滑性能及其应用

详细介绍了二硫化钼的结构特点以及作为固体润滑减磨材料的原理.综述了二硫化钼作为固体润滑的粘结型固体润滑膜、沉积型固体润滑膜这两种固体润滑膜的性能及工艺特点,并介绍了它们在工业上的应用及其发展现状.     

固体润滑技术讲座──第四讲 层状固体润滑材料

固体润滑技术讲座──第四讲　层状固体润滑材料常州牵引电机厂石淼森关键词石墨，二硫化钼，氮化硼，润滑特性，应用常用的固体润滑材料主要是指具有层状结构的材料，如石墨、二硫化铝等无机物，以及用于２５０Ｃ以上高温的润滑材料，其中有单质硫化物、氧化物、氟化物和...     

固体润滑涂层的评价和使用

本文主要介绍了二硫化钼，石墨、聚四氟乙烯三种固体润滑涂层的特点以及润滑涂层摩擦磨损性能的评价手段和方法，以及台架试验和应用实例，提出了选用方法和步骤。     

镶嵌式复合径向滑动轴承的实验研究

对镶嵌式径向滑动轴承进行了实验研究,通过摩擦磨损实验进行了选材,提出了加工该型轴承的制造工艺,并采用台架试验测试了制得的几种镶嵌式径向滑动轴承的承载能力。结果表明：镶嵌式径向滑动轴承的承载能力比普通径向滑动轴承有较大的提高,其中镶嵌PTFE高分子材料的轴承,因PTFE材料能在其对偶件表面形成较为完全的转移膜,改善了轴承润滑性能,使轴承具有较高的承载能力。     

高温重载埋入型固体润滑轴承

本文介绍在高温(450℃以内)和超重载荷条件下,利用石墨或二硫化钼等固体润滑剂作润滑膜的埋入型固体润滑轴承。固体润滑轴承是在不能使用润滑油的特殊条件下,以固体润滑剂来代替油的轴承。通常用于钢铁工业以及如桥梁支承和水库闸门等低速重载并难以形成油膜的地方。高温用轴承有多种,而固体润滑轴承是当前主要应用的一种。1.埋入型固体润滑轴承的特征固体润滑轴承和油膜轴承相似,两金属面由固体润滑膜隔开,但不存在润滑油或润     

二硫化钼润滑材料在我厂的应用

二硫化钼是固体润滑剂,它有许多优良的性能,对高温、高速、高负荷、有化学腐蚀性和超高真空条件下的设备有优异的润滑功效,尤其适用于油类润滑难以维持,处于边界状态的摩擦部位。我厂在毛主席革命路线指引下,成立了应用二硫化钼润滑新技术试验小组,由专人负责,在厂里一些设备和机械加工中推广应用二硫化钼润滑材料,现将情况介绍如下:     

二硫化钼润滑剂的应用

(一)二硫化钼固体润滑干膜二硫化钼固体润滑干膜是将二硫化钼粉末分散在粘结剂中,用溶剂稀释后,喷涂、浸涂或刷涂在所用部件的表面上,经固化而成。我厂某些设备使用了二硫化钼固体润滑干膜,使用效果良好,介绍如下。1.应用设备我厂使用二硫化钼固体润滑干膜的设备,有PM-400和PM-650圆柱齿轮减速器(为化工专用设备混同机、漂洗机、光泽机等所用)。由于减速器是安装在设备盖上,振动大,极易漏     

无油压缩机固体润滑滑动轴承的实验研究

对无油润压缩机滑动轴承进行了固体润滑处理,将优化组合的复合自润滑材料,镶嵌于滑块或压缩机的滑块内孔,并在实验台架上进行了磨损实验,选取了一种磨损性能较好自润滑材料,实验结果表明,本文设计固体润同承基本适合工程应用。     

硫化物固体润滑剂的研究现状

综述固体润滑材料中应用最为广泛的硫化物固体润滑剂的研究现状;介绍硫化亚铁、二硫化钼、硫化钨以及二硫化锌固体润滑剂的制备工艺的发展及其相应的润滑薄膜的摩擦学性能;指出进一步弄清渗流层硫化亚铁的减磨机制以及改善二硫化钼的抗潮性以及与基体的结合强度是未来的研究方向.     

Investigation on MoS2 and graphite coatings and their effects on the tribological properties of the radial spherical plain bearings

With constant enlargement of the application areas of the spherical plain bearings, higher quality lubrication of the bearings is required. To solve the lubricating problems of spherical plain bearings under high temperature, high vacuum, high speed, heavy loads and strong oxidation conditions, it is urgent for us to develop more excellent self-lubricating technologies. In this paper, the bonded solid lubricant coatings, which use inorganic phosphate as the binder, the mixture of MoS2 and graphite with two different weight proportions as the solid lubricant, are prepared by spraying under three different spray gun pressures. The bonding strength tests on the coatings show that the best spraying pressure is 0.2 MPa and the better mixing proportion of MoS2 to Graphite is 3:1. Then for the radial spherical plain bearings with steel/steel friction pair, after the coatings are made on the inner ring outer surfaces, the friction coefficient, the wear loss and the friction temperature of the bearings under four oscillating frequencies are investigated by a self-made tribo-tester. The test results, SEM of the worn morphologies and EDS of worn areas show that tribological properties of the bearing are obviously improved by the bonded solid lubricant coatings. When sprayed under the spray gun pressure of 0.2 MPa, the bearings have better anti-friction and anti-wear properties than those sprayed under 0.1 MPa and 0.3 MPa. Further as proved from the XPS analysis, between the coating with 3:1 mixing ratio of MoS2 to Graphite and the coating with 1:1 ratio, the former has less oxidation occurred on the surface and therefore has better tribological characteristics than the latter. This paper provides a reference to developing a new product of the radial spherical plain bearings with high bonding strength, oxidation resistance and abrasion resistance.     

双金属轴承材料表面黏结润滑涂层摩擦学性能研究

在HDM-10型端面摩擦磨损试验机上进行油润滑及规律变载条件下的摩擦磨损试验,考察了石墨﹑MoS2及其复合黏结润滑涂层的摩擦磨损性能.结果表明:固体润滑涂层显示了较好的减摩耐磨性能,摩擦副正常阶段的摩擦系数在0.09以下,摩擦温升小,涂层的承载载荷都超过了2 800 N,最高达到4 800N;石墨与MoS2有较好的协同效应,当石墨、MoS2与胶黏剂的比例为3∶ 2∶ 10时,涂层的摩擦学性能最佳.     

固体润滑涂层在干摩擦及有油条件下的摩擦磨损性能

采用MRH-3环块磨损试验机对FM-510二硫化钼润滑涂层在于摩擦及有油条件下进行了摩擦磨损性能的考察和评价,评价结果表明：该涂层在干摩擦条件下具有低的摩擦系数、高的承载能力和长的耐磨寿命,摩擦系数随负荷增高而降低,随速度提高也降低。摩擦偶对双面涂膜比单面涂膜有更长的耐磨寿命,速度低时涂层的磨耗小,寿命长,可满足特定条件下的干摩擦工作要求,在有油润滑条件下二硫化钼基的FM-510润滑涂层可显减轻对偶磨损程度,摩擦系数比单独使用油润滑时大大降低。在难以形成连续的流体润滑薄膜,亦即不能形成流体动力润滑的情况下。摩擦偶对涂敷固体润滑涂层是解决其润滑问题的有效方案。     

粘结固体润滑涂层在油润滑条件下的摩擦学性能

为了探讨粘结MoS2基固体润滑涂层在油润滑条件下的抗磨减摩性能,采用MHK-500型摩擦磨损试验机对粘结MoS2基固体润滑涂层在4种常用油(液体石蜡、RP-3煤油、4050滑油和CD-40柴油)润滑下的摩擦磨损性能进行了研究,考察了速度和载荷对润滑涂层在4种不同的常用油润滑下的摩擦磨损性能。结果表明,在低载荷(320N)试验条件下,4种常用油润滑下涂层的耐磨性比干摩擦下得到显著的提高,摩擦因数从0.12降低到0.08左右;但在高载荷(1100N)下,油润滑对涂层的摩擦磨损性能没有明显的改善。只有在合适的载荷下,固/油复合润滑技术可明显改善摩擦副的润滑性能。     

钢背衬碳纤维织物/环氧复合材料干摩擦特性研究

研究了钢背衬碳纤维织物/环氧复合材料在环-环端面干摩擦状态下的摩擦学特性,考察了MoS2与石墨粉及其配比、衬层厚度、法向载荷对衬层干摩擦性能的影响,用扫描电子显微镜对衬层的磨损表面及对偶件45^#钢环表面进行了观察与分析。结果表明：厚度为1.5mm的试环衬层在摩擦过程中主要表现出粘结磨损特性,而含20%（质量分数）MoS2粉的0.6mm衬层表现出疲劳磨损与磨粒磨损特性。摩擦因数-时间特性曲线表明MoS2粉在降低衬层摩擦因数的同时能够抑制环氧树脂向对偶钢环表面的粘结;石墨对衬层的减摩效果优于MoS2粉,但摩擦温升引起树脂向偶件表面转移增多使得减摩效果大大降低;质量分数为33%的MoS2与石墨粉衬层表现出最佳的摩擦学性能,衬层摩擦因数具有随载荷先减小后上升的趋势。     

高速钢刀具固体润滑涂层的试验研究

借助M-2型摩擦磨损试验机考察了在试件表面涂敷由MoS2、石墨、Al2O3、Sb2O3复配而成的固体润滑涂层后的摩擦学性能,通过正交试验得到最佳配比为:MoS2:石墨:Al2O3:Sb2O3=7:4:2.5:4。将复合固体润滑涂层涂敷于高速钢车刀并进行切削试验,试验结果表明,复合固体润滑涂层可以改善刀具切削过程中的润滑条件,大大提高刀具切削性能。     

Friction and wear behaviors of MoS2/Zr coated HSS in sliding wear and in drilling processes

MoS2 metal composite coatings have been successful used in dry turning, but its suitability for dry drilling has not been yet established. Therefore, it is necessary to study the friction and wear behaviors of MoS2/Zr coated HSS in sliding wear and in drilling processes. In the present study, MoS2/Zr composite coatings are deposited on the surface of W6Mo5Cr4V2 high speed steel(HSS). Microstructural and fundamental properties of these coatings are examined. Ball-on-disc sliding wear tests on the coated discs are carried out, and the drilling performance of the coated drills is tested. Test results show that the MoS2/Zr composite coatings exhibit decreases friction coefficient to that of the uncoated HSS in sliding wear tests. Energy dispersive X-ray(EDX) analysis on the wear surface indicates that there is a transfer layer formed on the counterpart ball during sliding wear processes, which contributes to the decreasing of the friction coefficient between the sliding couple. Drilling tests indicate that the MoS2/Zr coated drills show better cutting performance compared to the uncoated HSS drills, coating delamination and abrasive are found to be the main flank and rake wear mode of the coated drills. The proposed research founds the base of the application of MoS2 metal composite coatings on dry drilling.     

载流下MoS2/Ag纳米复合薄膜摩擦学性能

MoS₂基纳米复合薄膜具有良好的摩擦学性能,但较差的导电性能限制了其在载流条件下作为润滑材料的应用。为提高MoS₂基纳米复合薄膜的导电性能,采用非平衡磁控溅射系统沉积2种不同Ag含量的MoS₂/Ag纳米复合薄膜,并在不同的电流条件下研究MoS₂/Ag纳米复合薄膜与GCr15钢球对摩时的摩擦学性能。结果表明：在载流下2种MoS₂/Ag纳米复合薄膜表现出相似的摩擦性能,而低掺杂MoS₂/Ag薄膜具有更佳的耐磨性能,这归因于低掺杂MoS₂/Ag薄膜具有较好的力学性能;无载流时,MoS₂/Ag纳米复合薄膜在摩擦过程中生成的氧化物颗粒增加了磨损、降低了润滑性,磨损机制主要为磨粒磨损;电流小于0.5 A时,电流促进了转移膜形成,使得摩擦因数降低,但磨损率增加,磨损机制主要为黏着磨损;当电流大于0.5 A时,由于电弧烧蚀加速了薄膜的磨损,磨损机制主要为磨粒磨损、黏着磨损和电弧腐蚀磨损。     

Effect of electrical current on the tribological behavior of the Cu-WS2-G composites in air and vacuum

As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments are eagerly required. Herein a copper-based composite with WS2 and graphite as solid lubricant are fabricated by powder metallurgy hot-pressed method. The friction and wear behaviors of the composites with and without current are investigated under the condition with sliding velocity of 10 m/s and normal load of 2.5N/cm 2 in both air and vacuum. Morphologies of the worn surfaces are observed by optical microscope and compositions of the lubricating films are analyzed by XPS. Surface profile curves and roughness of the worn surfaces are obtained by 2205 surface profiler. The results of wear tests show that the friction coefficient and wear volume loss of the composites with current are greater than that without current in both air and vacuum due to the adverse effects of electrical current which damaged the lubricating film partially and roughed the worn surfaces. XPS results demonstrate that the lubricating film formed in air is composed of oxides of Cu, WS2 , elemental S and graphite, while the lubricating film formed in vacuum is composed of Cu, WS2 and graphite. Because of the synergetic lubricating action of oxides of Cu, WS2 and graphite, the composites show low friction coefficient and wear volume loss in air condition. Owing to the fact that graphite loses its lubricity which makes WS2 become the only lubricant, severe adhesive and abrasive wear occur and result in a high value of wear rate in vacuum condition. The formation of the lubricating film on the contact interface between the brush and ring is one of the factors which can greatly affect the wear performance of the brushes. The low contact voltage drop of the composites in vacuum condition is attributed to the high content of Cu in the surface film. This study fabricated a kind of new sliding electrical contact self-lubricating composite with dual-lubricant which can work well in both air and vacuum environments and provides a comprehensive analysis on the lubrication mechanisms of the composite.     

Effect of lubricants on the friction and wear of Al2O3 against gray cast iron

The tribological behavior of ceramic Al₂O₃ coupled with gray cast iron (PHT) with different lubricants was investigated using a ring-on-block wear tester. In the wear test, air, distilled water, emulsion and oil were used as lubricants respectively in order to check the lubricating effectiveness of lubricants and the friction mechanism of solid graphite in the cast iron. Wear testing of 0.8% C steel (T8) sliding with Al₂O₃ was also carried out to compare with the test using gray cast iron. From these data the tribological behavior of graphite in the iron can be evaluated. The results show that the friction and wear of tested couples are decreased using different lubricants in the following order: air, distilled water, emulsion and oil. When lubricating with air and water, graphite in the iron as solid lubricant can decrease the friction and wear of the couples. However, when lubricating with emulsion and oil, graphite does not show the advantage of decreasing friction and wear.