PTFE三层复合轴承材料摩擦温升与摩损机理的关联性研究
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摘要
文章研究了聚四氟乙烯(polytetrafluoroethylene,PTFE)三层复合轴承材料在摩擦过程中产生的摩擦温度与其磨损机理的关联性。根据摩擦温度的变化特性可将摩擦过程分为磨合、摩擦平稳、PTFE软化黏着、稳定摩擦以及剧烈磨损5个阶段。研究结果表明:摩擦温升曲线的变化对应着摩擦系数的变化,与磨损机理有着密切的关联性;低温阶段对应磨合阶段;第1个温度转折点之后摩擦进入摩擦平稳阶段;第2个温度转折点之后摩擦进入PTFE软化黏着阶段;第3个温度转折点之后再次进入稳定摩擦阶段;第4个温度转折点之后,摩擦系数增大,进入剧烈磨损阶段。
In this paper,the relation between frictional temperature and wear mechanism of polytetrafluoroethylene(PTFE)three-layered composite bearing materials was investigated.According to the variation of frictional temperature,the friction process could be divided into following stages:running-in stage,stable friction stage,PTFE softening and adhesion stage,stable friction stage and severe wear stage.The results showed that the change of the frictional temperature curve was in keeping with the variation of friction coefficients,and it was closely related to wear mechanisms.The low temperature stage corresponded to the running-in stage.After the first transition point at the frictional temperature curve,the friction process came into stable friction stage.After the second transition point,the friction turned into PTFE softening and adhesion.After the third transition point,the friction re-entered the stable friction stage.After the fourth transition point,the friction coefficient increased and the friction entered into the severe wear stage.
In this paper,the relation between frictional temperature and wear mechanism of polytetrafluoroethylene(PTFE)three-layered composite bearing materials was investigated.According to the variation of frictional temperature,the friction process could be divided into following stages:running-in stage,stable friction stage,PTFE softening and adhesion stage,stable friction stage and severe wear stage.The results showed that the change of the frictional temperature curve was in keeping with the variation of friction coefficients,and it was closely related to wear mechanisms.The low temperature stage corresponded to the running-in stage.After the first transition point at the frictional temperature curve,the friction process came into stable friction stage.After the second transition point,the friction turned into PTFE softening and adhesion.After the third transition point,the friction re-entered the stable friction stage.After the fourth transition point,the friction coefficient increased and the friction entered into the severe wear stage.
引文
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[2]杨东亚,王月,龚俊,等.聚苯硫醚与纳米Al2O3填充聚四氟乙烯复合材料的摩擦磨损性能[J].润滑与密封,2013,38(11):72-77.
[3]KRICK B A,EWIN J J,BLACKMAN G S,et al.Environmental dependence of ultra-low wear behavior of polytetrafluoroethylene(PTFE)and alumina composites suggests tribochemical mechanisms[J].Tribology International,2012,51(7):42-46.
[4]牛永平,王亮,杜三明,等.不同温度下PTFE纳米复合材料摩擦学性能的研究[J].塑料工业,2011,39(7):83-86.
[5]邓联勇,范清,彭兵,等.PTFE复合材料高温摩擦磨损性能研究[J].润滑与密封,2008,33(8):103-106.
[6]THEILER G,HUBNER W,GRADT T,et al.Friction and wear of PTFE composites at cryogenic temperatures 1[J].Tribology International,2002,35(7):449-458.
[7]刘建,张永振,杜三明,等.聚四氟乙烯编织复合材料摩擦温度与磨损特性[J].机械工程学报,2012,48(23):90-94.
[8]林子钧.热力耦合条件下PTFE基复合材料摩擦温度场的数值分析[D].合肥:合肥工业大学,2010.
[9]JAIN V K,BAHADUR S.Material transfer in polymer-polymer sliding[J].Wear,1978,46(1):177-188.
[10]解挺,杨辉,许振兴,等.钢件表面纹理方向对SiO2/PTFE复合材料摩擦转移膜的影响[J].合肥工业大学学报(自然科学版),2014,37(5):513-515.
[11]LI H L,YIN Z W,JIANG D,et al.A study of the tribological behavior of transfer films of PTFE composites formed under different loads,speeds and morphologies of the counterface[J].Wear,2015,328/329:17-27.