激光熔覆Ni45-CaF2-WS2自润滑涂层组织与性能

利用C02激光器,在45号钢表面熔覆Ni45-CaF2-WS2粉末制备自润滑复合涂层,研究熔覆涂层微观组织和摩擦磨损性能及其影响规律。结果表明,熔覆过程中,WS2发生部分分解,形成新的润滑相CrxSy和CaWO4,CaF2的存在对熔池的流动性有极大的改善;涂层的室温及400℃摩擦性能测试也表明,复合自润滑涂层的摩擦因数显著降低,且Ni45-7．5CaF2-7．5WS2（质量分数,％）涂层的摩擦磨损性能较佳。     

Tribological characteristics of C/C-SiC braking composites under dry and wet conditions

C/C-SiC braking composites, based on reinforcement of carbon fibers and matrices of carbon and silicon carbide, were fabricated by warm compaction and in situ reaction process. The tribological characteristics of C/C-SiC braking composites under dry and wet conditions were investigated by means of MM-1000 type of friction testing machine. The influence of dry and wet conditions on the tribological characteristics of the C/C-SiC composites was ascertained. Under dry condition, C/C-SiC braking composites show superior tribological characteristics, including high coefficient of friction （0.38）, good abrasive resistance （thickness loss is 1.10 μm per cycle） and steady breaking. The main wear mechanism is plastic deformation and abrasion caused by plough. Under wet condition, frictional films form on the worn surface. The coefficient of friction （0.35） could maintain mostly, and the thickness loss （0.70 μm per cycle） reduces to a certain extent. Furthermore, braking curves are steady and adhesion and oxidation are the main wear mechanisms.     

摩擦学系统设计计算方法比较

通过丝杆螺母副摩擦学设计的实例,对几种不同的摩擦学系统设计计算方法进行了比较,分析几种方法各自的优点和不足,以寻求较好的设计计算方法．人工智能及人工神经网络技术具有强大的自学习功能和联想功能,尤适合于解决难以求得精确数学计算公式的问题．     

纳米SiO2对聚丙烯酸酯复合涂层在水润滑下摩擦学性能的影响

考察了纳米SiO₂对聚丙烯酸酯复合涂层在水润滑下摩擦磨损性能的影响。利用FTIR分析纳米SiO₂与聚丙烯酸酯的界面结合;利用SEM观察复合涂层磨损表面,并结合FTIR和摩擦磨损实验分析其磨损机理。结果表明:水润滑时,聚丙烯酸酯在摩擦过程中会发生摩擦化学反应,引起涂层摩擦腐蚀磨损;而纳米SiO₂能与聚丙烯酸酯以化学键的形式结合,它的加入有助于摩擦界面在水介质中形成具有较好减摩作用的表面膜和水分子膜,提高聚丙烯酸酯复合涂层的耐磨性。在水润滑下,当纳米SiO₂的含量较低时,涂层表面的磨损形式为摩擦腐蚀磨损和磨粒磨损;当纳米SiO₂的含量达到5wt% 时,涂层表面形成完整的表面膜和水分子膜,此时涂层具有良好的摩擦学性能。      

The effect of oxygen content on the temperature dependent tribological behavior of Cr-O-N coatings

CrN, Cr-O-N and Cr-O coatings with different oxygen contents were produced with reactive cathodic arc physical vapor deposition on high speed steel substrates. The temperature dependent friction and wear behaviours of these coatings were investigated within the temperature range of 25-100 °C. The results of the study showed that it is possible to produce CrN coatings with temperature independent, low coefficient of friction (CoF) and wear behavior by introducing oxygen into them. The amount of oxygen in the coating played a critical role on the tribological behavior. Only, in the coatings produced with oxygen content higher than 46%, a temperature independent wear behavior was observed. The structure and chemistry of the coatings and wear tracks were investigated with XRD and micro Raman spectroscopy. The coatings, with an oxygen content higher than 46%, consisted of Cr₂O₃ and other compounds that are giving broad Raman shifts between 675-834 cm^− 1. With the presence of compounds giving Raman shifts at 675-834 cm^− 1, in the film and/or in the wear track, it became possible to achieve films with temperature independent, low CoF and wear behavior.     

纳米SiC/SiO_2复合体系的高温减摩抗磨性能研究

用SRV摩擦磨损试验机考察了纳米SiC/SiO_2复合体系的高温抗磨减摩性能.结果表明,在连续加载高温试验中,SiC/SiO_2复合体系在较低负荷下摩擦系数改善不明显,但当SiC/SiO_2之比为0.5时能明显改善基础油在高温高负荷条件下的减摩性能.在50 N恒定载荷,温度为200和400 ℃时,SiC/SiO_2复合体系对基础油的高温减摩抗磨性能都有不同程度的提高,其中当SiC/SiO_2之比为0.1时最为明显,其抗磨性能分别提高了90%和76%.     

纳米硼酸铜的表征与在水介质中的摩擦学性能

采用透射电子显微镜(TEM)、X射线衍射(XRD)和红外光谱(IR)对油酸钠修饰硼酸铜纳米颗粒的形貌、物相和表面结构进行了表征，制备的硼酸铜纳米粒子粒径为60～90 nm，并能在水中均匀分散。用四球试验机考察了硼酸铜纳米粒子在水介质中的摩擦学性能及用扫描电子显微镜(SEM)观察了摩斑表面形貌。结果表明，添加质量分数为0.1% 2.5%的油酸钠修饰硼酸铜纳米粒子，可使水的承载能力显著提高，抗磨减摩性能也有较大提高。用X射线光电子能谱(XPS)分析了蚀球磨斑表面的化学成分，在摩擦副表面检测出Cu，B，Fe等的氧化物,硼酸铜纳米粒子沉积在摩擦表面上以及生成的氧化物保护膜起良好的抗磨减摩作用。     

Structure and tribological behavior of layered TiN-BrAZh9-4 coatings obtained from metallic plasma flows

The possibility is shown of the formation of layered TiN-BrAZh9-4 coatings by vacuum-arc deposition on a surface that subsequently crosses flows of metallic plasma generated by two opposite sources. The tribological behavior of the coatings has been studied in comparison with a TiN coating, and their high wear resistance was reported. A selective transfer effect was revealed in the TiN-BrAZh9-4 coatings.     

纳米氧化镧在润滑油中的应用研究

选择吐温60、司班20、司班80和聚醚作为活性剂对纳米氧化镧（n—La2O3）进行改性，配制了含纳米氧化镧的润滑油，并在MRS-1J四球磨损实验机上考察了润滑油的摩擦学性能。结果表明：吐温60、司班20、司班80和聚醚比例为2：1：1：3时对纳米氧化镧粒子具有最好的分散效果，且纳米氧化镧质量分数为0．8％时，具有最佳的摩擦学性能；与500SN基础油相比，其PB值提高了40．8％，磨斑直径降低了36．9％，摩擦因数降低了29％。     

Tribotronics—Towards active tribology

A constant trend towards more compact mechanical systems with higher power densities and increased thermo-mechanical loads emphasises the importance of the development of new design approaches and novel tribological systems. Ignoring this may cause a significant slow down in technological and industrial development. Tribotronics or active tribology based on adaptive performance is thought of as being critical in the implementation of smart machine concepts. Recognition of the importance of tribotronics, or active control of system loss outputs, such as those through friction and wear will have significant beneficial economic consequences as a result of the associated accelerated rate of technological progress. These smart tribotronic systems can be embedded in a great variety of machines and mechanisms. If this integration is made at the design stage, products that are more flexible, efficient and reliable can be produced. The concept of tribotronics is presented and discussed in this paper. Some illustrative examples that show the feasibility of an “active” approach are given. In addition, various possibilities already reported in literature are discussed.