In this study, the properties of hip implant material and lubricants were examined using a pin on disc apparatus, to compare the effect of metal-on-metal （MoM） contact with a bio-lubricant derived from palm oil. The...In this study, the properties of hip implant material and lubricants were examined using a pin on disc apparatus, to compare the effect of metal-on-metal （MoM） contact with a bio-lubricant derived from palm oil. The behaviour of the lubricants was observed during the experiments, in which a hemispherical pin was loaded against a rotating disc with a groove. A titanium alloy was used to modify the hemispherical pin and disc. Before and after the experiments, the weight and surface roughness were analysed, to detect any degradation. The results were compared according to the different kinematic viscosities. The wear rates and level of friction with each lubricant were also examined. The lubricant with the highest vis- cosity had the lowest frictional value. Therefore, develop- ing suitable lubricants has the potential to prolong the lifespan of prostheses or implants used in biomedical applications. The experiments collectively show that lubricants derived from palm oil could be used as efficient bio-lubricants in the future.展开更多
The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl ...The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl titanate to 12-hydroxystearic acid was 1/0.5. The bonding form between 12-hydroxystearic acid and TiO_2 nucleus was investigated by FTIR, DSC, TGA and XRD techniques. The lubricating grease containing the surface modified TiO_2 nanoparticles possesses excellent anti-wear and anti-friction properties. Compared with the grease without TiO_2, the PB value can be increased by 52% as the best performance of the grease containing surface modified TiO_2 nanoparticles, while the friction coefficient can be reduced by 33% with the addition of a small amount of TiO_2 nanoparticles, and meanwhile the wear scar diameter decreases by 25%.展开更多
介绍了鞋类产品防滑性能及国内外标准情况。通过对比的方式,分析了GB/T3903.6、SATRA TM144和BS EN ISO 13287鞋类防滑性能试验方法试验原理、试验试剂与介面、试样制备、试验条件、试验模式的异同。通过对同一材质同一样品进行后跟、...介绍了鞋类产品防滑性能及国内外标准情况。通过对比的方式,分析了GB/T3903.6、SATRA TM144和BS EN ISO 13287鞋类防滑性能试验方法试验原理、试验试剂与介面、试样制备、试验条件、试验模式的异同。通过对同一材质同一样品进行后跟、前掌与水平的测试,得到结论:3种方法测得的动摩擦系数基本一致。展开更多
基金support by the Research University Grant(RUG)from Universiti Teknologi Malaysia(Grant No.03H58)Fundamental Research Grant Scheme(FRGS)from Ministry of Higher Education(MOHE)Malaysia+2 种基金E-Science Fund Grant and Exploratory Research Grant Scheme(ERGS)from Ministry of Sciencethe awards of the UTM-RMC Postdoctoral Fellowship(Norzahir Sapawe)the Faculty of Mechanical Engineering Universiti Teknologi Malaysia
文摘In this study, the properties of hip implant material and lubricants were examined using a pin on disc apparatus, to compare the effect of metal-on-metal （MoM） contact with a bio-lubricant derived from palm oil. The behaviour of the lubricants was observed during the experiments, in which a hemispherical pin was loaded against a rotating disc with a groove. A titanium alloy was used to modify the hemispherical pin and disc. Before and after the experiments, the weight and surface roughness were analysed, to detect any degradation. The results were compared according to the different kinematic viscosities. The wear rates and level of friction with each lubricant were also examined. The lubricant with the highest vis- cosity had the lowest frictional value. Therefore, develop- ing suitable lubricants has the potential to prolong the lifespan of prostheses or implants used in biomedical applications. The experiments collectively show that lubricants derived from palm oil could be used as efficient bio-lubricants in the future.
文摘The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl titanate to 12-hydroxystearic acid was 1/0.5. The bonding form between 12-hydroxystearic acid and TiO_2 nucleus was investigated by FTIR, DSC, TGA and XRD techniques. The lubricating grease containing the surface modified TiO_2 nanoparticles possesses excellent anti-wear and anti-friction properties. Compared with the grease without TiO_2, the PB value can be increased by 52% as the best performance of the grease containing surface modified TiO_2 nanoparticles, while the friction coefficient can be reduced by 33% with the addition of a small amount of TiO_2 nanoparticles, and meanwhile the wear scar diameter decreases by 25%.
文摘介绍了鞋类产品防滑性能及国内外标准情况。通过对比的方式,分析了GB/T3903.6、SATRA TM144和BS EN ISO 13287鞋类防滑性能试验方法试验原理、试验试剂与介面、试样制备、试验条件、试验模式的异同。通过对同一材质同一样品进行后跟、前掌与水平的测试,得到结论:3种方法测得的动摩擦系数基本一致。
