Al2O3／TiB2／SiCW陶瓷刀具加工镍基合金时的磨损机理研究

研究了Ａｌ２Ｏ３／ＴｉＢ２／ＳｉＣＷ陶瓷刀具加工Ｉｎｃｏｎｅｌ７１８镍基合金时的切削性能和磨损机理。结果表明；在低速切削条件下，Ａｌ２Ｏ３／ＴｉＢ２／ＳｉＣＷ和硬质合金刀具的抗后刀面磨损的能力相差不大；而在高速切削条件下，前者的抗后刀面磨能力远高于后者。     

超高密度磁记录的课题与展望

介绍了超高密度记录的研究开发状况 ,论述了垂直磁记录技术的课题以及采用TMR磁头的、记录密度为Subterabit in2 的记录 读出特性。作为高密度记录所必需的头 盘界面技术 ,提出了接触记录技术的课题 ,还就STM (Scanningtunnelingmicroscopy)存储器论述了未来超高密度技术     

An analysis method for atomistic abrasion simulations featuring rough surfaces and multiple abrasive particles

We present a molecular dynamics (MD) model system to quantitatively study nanoscopic wear of rough surfaces under two-body and three-body contact conditions with multiple abrasive particles. We describe how to generate a surface with a pseudo-random Gaussian topography which is periodically replicable, and we discuss the constraints on the abrasive particles that lead to certain wear conditions. We propose a post-processing scheme which, based on advection velocity, dynamically identifies the atoms in the simulation as either part of a wear particle, the substrate, or the sheared zone in-between. This scheme is then justified from a crystallographic order point of view. We apply a distance-based contact zone identification scheme and outline a clustering algorithm which can associate each contact atom with the abrasive particle causing the respective contact zone. Finally, we show how the knowledge of each atom’s zone affiliation and a time-resolved evaluation of the substrate topography leads to a break-down of the asperity volume reduction into its components: the pit fill-up volume, the individual wear particles, the shear zone, and the sub-surface substrate compression. As an example, we analyze the time and pressure dependence of the wear volume contributions for two-body and three-body wear processes of a rough iron surface with rigid spherical and cubic abrasive particles.     

耐磨抗冲击氧化铝陶瓷异型件的研制

主要研究了高铝快速磨罐、弧形衬板、球磨机磨口、研钵等异型件的配方及注浆成型工艺。试验配制了高铝泥浆用复合稀释荆及复合添加剂，使制品的显微结构均匀，密度得到了显著提高。     

几种工程塑料摩擦磨损性能的分析与比较

对聚甲醛，尼龙1010和聚四氟乙烯三种工程塑料的摩擦磨损性能进行了测试，分析和比较了它们不同截荷及不同对磨时间的摩擦磨损性能。     

A rapid test to measure performance,emission and wear of a diesel engine fueled with palm oil diesel

Results of performance, emission and tribological evaluations of palm oil methyl ester and its blends with conventional diesel in an automobile diesel engine test bed are presented. Polymerization and carbon deposits on the fuel injector were monitored. CO, CO₂, O₂, combustion efficiency and temperature of exhaust gases were also measured. Palm oil methyl ester and its blends have great potential as alternative diesel fuel. Performance and exhaust gas emission for palm oil methyl ester and its blends with conventional diesel are comparable with those of conventional diesel fuel. Palm oil methyl ester does not pose a severe environmental problem and will not deteriorate engine and bearing components.     

Duration of slip-resistant shoe usage and the rate of slipping in limited-service restaurants: results from a prospective and crossover study

Several studies have indicated that slip-resistant shoes may have a positive effect on reducing the risk of slips and falls, a leading cause of injury at work. Few studies, however, have examined how duration of shoe usage affects their slip-resistance properties. This study examined the association between the duration of slip-resistant shoes usage and the self-reported rate of slipping in limited-service restaurant workers. A total of 475 workers from 36 limited-service restaurants in the USA were recruited to participate in a 12-week prospective study of workplace slipping. Of the 475 participants, 83 reported changing to a new pair of shoes at least once during the 12-week follow-up. The results show that slip-resistant shoes worn for less than six months were moderately more effective than those worn for more than six months. Changing to a new pair of shoes among those wearing slip-resistant shoes at baseline was associated with a 55% reduction in the rate of slipping (RR = 0.45, 95% CI = 0.23–0.89). Further research is needed to develop criteria for the replacement of slip-resistant shoes.

Practitioner Summary: The duration of usage impacts the slip-resistance properties of slip-resistant shoes. Slip-resistant shoes worn for less than six months were moderately more effective in reducing slips than slip-resistant shoes worn for more than six months. Shoe use policies should not only encourage or require their use but also include guidance on replacing slip-resistant shoes at regular intervals.     

基体和增强体对聚合物基摩擦材料性能影响研究

摩擦系数、磨损率和冲击强度是聚合物基摩擦材料的重要性能指标。本文试验研究基体含量对摩擦系数、磨损率的影响和增强体含量对冲击强度的影响,从理论方面分析增强体对摩擦磨损性能的影响。试验结果表明,在进行聚合物基摩擦材料的配方设计时,要根据所选用酚醛树脂和增强纤维的种类合理控制用量,可达到较好的摩擦磨损性能和冲击韧性。     

地籍测量中界址点的精度影响因素与技术对策

简单介绍了界址点精度及其测量方法,分析了棱镜偏心对测量误差的影响,并提出了一些技术对策。