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.     

模数对无机富锌涂料和涂层性能的影响

硅酸钾富锌涂料是目前广泛使用的钢铁防腐蚀涂料。作为涂料粘结剂的高模数硅酸钾溶液对涂料和涂层的性能有重要影响。本研究考察了硅酸钾粘结剂的模数变化对涂料及涂层性能产生的影响。实验结果表明：粘结剂模数的提高可以提高固化后涂层的耐水性能，当粘结剂模数在5.0左右时，所得富锌涂层具有最佳的耐磨性能，但当粘结剂模数超过5.5时会造成涂料施工性能和贮存稳定性下降，涂层柔韧性降低，从而降低涂层的耐磨性能。     

聚苯硫醚/聚四氟乙烯复合材料的研究

制备并研究了PPS/PTFE合金的热行为、力学性能以及摩擦学性能,并对其微观形态进行了观察。实验结果表明,此合金的耐热性能相对于聚苯硫醚纯树脂有明显的提高,而且聚四氟乙烯的加入可以改善聚苯硫醚的力学性能及摩擦磨损性能。     

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。     

氮化硅陶瓷高温摩擦学性能

本文研究热压氮化硅陶瓷与３Ｃｒ２Ｗ８Ｖ钢组成的销－盘摩擦副，在空气中非润滑条件下，４００～８００℃不同载荷（４９～３４３Ｎ）的摩擦磨损性能；测定了磨擦系数和Ｓｉ３Ｎ４销的磨损因子；通过对Ｓｉ３Ｎ４磨损面的ＳＥＭ形貌观察、Ｘ射线相结构分析，探讨了陶瓷销的磨损机理     

Ni—P—Si3N4化学复合镀层性能测试

对Ｎｉ－Ｐ－Ｓｉ３Ｎ４复合镀层的显微硬工、耐磨性及结合强度进行了测试。结果表明：化学沉积Ｎｉ－Ｐ－Ｓｉ３Ｎ４合金是一种值得推广应用的新耐磨镀层。