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采用自行研制的往复摩擦磨损试验机,在法向载荷为50 N、往复频率1 Hz、摩擦副接触形式为圆环外圆周/平面、初始线接触长度为6 mm,相对湿度为80%、体积含量25%小牛血清去离子水溶液边界润滑的试验条件下,研究试验环境温度对超高分子量聚乙烯(UHMWPE)与钛合金配副的往复摩擦磨损性能的影响,并利用扫描电子显微镜观察37℃时磨损表面形貌。结果表明:试验环境温度θ由10℃升高至30℃,UHMWPE/钛合金摩擦副的平均摩擦因数aμ呈明显下降趋势,由30℃升高至37℃时,μa开始缓慢上升,UHMWPE的体积磨损量Wv随试验环境温度θ变化也呈现相似的规律;磨损机制主要表现为磨料磨损。
The self-developed reciprocating friction and wear testing machine has a normal load of 50 N and a reciprocating frequency of 1 Hz. The contact form of the friction pair is the outer circumference of the ring / plane. The initial contact length is 6 mm, the relative humidity is 80% The effect of experimental ambient temperature on the reciprocating friction and wear properties of ultra-high molecular weight polyethylene (UHMWPE) and titanium alloy was studied under the experimental conditions of 25% bovine serum deionized water solution boundary lubrication. The scanning electron microscopy When worn surface morphology. The results show that the average friction coefficient μμ of UHMWPE / titanium alloy friction pair decreases obviously when the ambient temperature θ increases from 10 ℃ to 30 ℃. When the temperature rises from 30 ℃ to 37 ℃, μa starts to increase slowly. The volume of UHMWPE The amount of wear Wv changes with the experimental ambient temperature θ also showed a similar pattern; wear mechanism mainly manifested as abrasive wear.