The Effects of Magnetic Treatment on the Tribological Behavior of AISI 1045 Steel under Lubricated Conditions

The mechanical and tribological properties of pulse-magnetized and untreated AISI 1045 steel were studied comparatively. The microhardness and microstructures of treated and untreated steel samples were analyzed to evaluate magnetic treatment effects on the mechanical properties. Dislocation densities were calculated from X-ray diffraction data according to the Williamson-Hall method. Tribological tests were conducted using a ball-on-disk reciprocating friction and wear tester. Scanning electron and energy-dispersive microscopies were used to analyze the morphologies and elements of worn surfaces. Dislocation densities of AISI 1045 steel were found to increase by 16.5% after magnetic treatment. Treated steel performed better under polyalphaolefin (PAO) base oil lubrication with each of five additives, especially when oleic acid was 0.2 and 1.5% (by mass), and the wear scar width and friction coefficient of treated samples were 46.9 and 16.4% lower than those of the untreated samples, respectively. Morphological analyses indicated that micromagnetic fields generated during friction tests not only promoted oxidation of the worn surface and debris but also produced thinner tribofilms that included chemical and adsorbed films.     

Surfactant controlled lubricity of paraffin oil-based nano-emulsion

Oil-in-water emulsions are used as metalworking fluids (MWFs). Considering the environmental issues and operator's health, the amount of oil-in-MWFs is one of the important parameters. In the present study, paraffin oil is used for emulsion formulation and possibilities to minimize the amount of paraffin oil-in-MWFs are explored. Physical characterization of emulsions is done using dynamic light scattering and goniometer. The tribological response of emulsions is recorded using the Four-ball tester. Results indicate that the amount of oil can be brought down to a level of 0.5% v/v to achieve the standard friction level. Droplet size and distribution seems to control the lubricity of emulsions, smaller droplets are desired for better lubrication.     

Synthesis and Tribological Behaviour of 1,3,4-Thiadiazole Schiff Base Derivatives as Multifunctional Lubricant Additives

Six new 1,3,4-thiadiazole Schiff base derivatives were synthesized and characterized by IR spectroscopy and ~1H NMR spectrometry, and their anti-corrosion properties and thermal stability were investigated via thermogravimetric analysis(TGA) and copper strip corrosion test. The tribological behavior of the said Schiff base derivatives was evaluated on an Optimol SRV~?4 oscillating reciprocating friction and wear tester. The worn surfaces of the steel discs were investigated using a scanning electron microscope(SEM) and energy dispersive X-ray spectrometer(EDS). The test results indicated that these thiadiazole Schiff base derivatives possessed favourable thermal stability, corrosion inhibiting ability and the capability of improving the tribological characteristic of the base oil effectively. It is assumed that the adsorbed additives probably reacted with the steel surfaces during the friction process, resulting in the formation of a protective film composed of sulphates, sulphides and organic nitrogen compounds.     

浅谈煤矿机械设备的润滑及管理

论述了润滑在煤矿机械设备运行中的作用，并就合理选择润滑方式等进行了进一步的探讨。     

冷轧润滑剂对高纯铝箔再结晶立方织构的影响

采用ODF分析法(晶体取向分布函数法)及SEM—EBSD(背散射电子衍射)技术研究和分析了不同冷轧润滑剂下高纯铝再结晶立方织构的形成和发展，结果表明，采用机油和煤油作润滑剂冷轧高纯铝箔时，退火后再结晶织构都是由很强的Cube织构以及弱的R织构组成，但煤油润滑比机油润滑冷轧样品退火后获得强得多的立方织构。再结晶立方织构的形成和发展受冷轧形变织构及显微组织结构不均匀性的影响。煤油润滑时样品中产生了大量的不均匀变形组织——剪切带，带中存在大量的立方取向结构，它们提供了形核条件，强化了再结晶立方织构；而机油润滑时冷轧样品变形比较均匀，很难观察到剪切带组织，也很难发现有立方取向结构，说明形变轧制织构和剪切带中的立方取向结构直接影响并控制着再结晶立方织构的形成和发展。     

粉煤灰在废润滑油再生中的应用研究

本文主要介绍粉煤灰在发电厂废润滑油再生中的应用研究。研究表明：粉煤灰是一种优良的吸附剂，节能效果十分明显，其生产成本是目前所采用的各种吸附剂的１／１５～１／５０，不但降低了劳动强度，而且再生油的重要指标都有所提高。     

润滑剂对轮轨摩擦与磨损的影响

利用MMS-2A磨损试验机模拟轮轨系统在润滑油、二硫化钼锂基脂、植物油和石墨钙基脂4种润滑剂润滑下的摩擦与磨损行为,研究润滑剂对轮轨副摩擦、磨损特性的影响.结果表明:与干态相比,4种润滑剂均使摩擦副的摩擦因数减小,表面磨痕深度减小,磨损量降低,其中石墨钙基脂的减摩和抗磨效果最好;试验结束后,轮轨试样接触表面的硬度均有不同程度的增加,其中涂有石墨钙基脂的轮轨试样的表面硬度增加最小.     

润滑油清净剂的超重力合成过程及产品性质评定

将超重力技术原理与润滑油清净剂合成反应机理相结合，提出利用超重力反应器原位制备高碱值石油磺酸钙清净剂的新工艺，研究了超重力法原位制备高碱值石油磺酸钙清净剂的工艺流程及作用机理，并对所制备的样品进行评定，结果表明制备的样品满足SH/T 0042-1991一级品标准要求。冷冻蚀刻观测结果表明，碱性石油磺酸钙胶体结构中碳酸钙晶体的粒径为10~30nm，平均粒径为20 nm，纳米尺度效应明显，产品具有良好的透光性和流动性。     

减摩剂对汽油机油节能减摩性能影响研究

简要介绍了润滑油节能减摩技术，并利用润滑油摩擦系数测定试验法和程序ⅥA台架对汽油机油的节能减摩性能进行了研究，分别讨论了油品粘度和摩擦改进剂对润滑油节能减摩技术的影响。     

低温微量润滑冷却装置的设计

伴随日益要求严苛的环保要求,企业在加工零件时需要用到大量的绿色制造技术。低温微量润滑加工技术作为一种新型的切削技术,符合绿色制造的要求并大量应用于生产过程中。介绍一种低温微量润滑冷却的气动-液压系统,主要利用微量润滑技术和涡流制冷技术,从气动-液压系统及电气三方面对样机进行设计并完成相关实验。所得实验成果对微量润滑装置的再升级具有一定的参考意义。