Friction and wear of PTFE composites at cryogenic temperatures
Friction and wear of PTFE composites at cryogenic temperatures
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DOI：
10.1016/s0301-679x(02)00035-x
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发表时间：
2002-07-01
影响因子：
6.2
通讯作者：
Friedrich, K
中科院分区：
文献类型：
--
作者：
Theiler, G;Hübner, W;Friedrich, K
本文研究了聚四氟乙烯复合材料在低温下对钢的摩擦学性能。结果表明，摩擦系数随温度降低至77 K而减小，但在极低温度下，摩擦系数不呈线性变化。由此可见，低温环境对聚合物复合材料的摩擦学性能有显著影响。在低滑动速度下，摩擦热减少，低温的影响更明显。在这种情况下，观察到从粘合剂到磨料的磨损机制的变化。SEM和AFM分析表明，在这些实验条件下研究的PTFE基复合材料在极低的温度下将材料转移到圆盘上。化学分析表明有氟化铁的存在。(C) 2002 Elsevier Science Ltd.版权所有。
This paper presents investigations on the tribological behaviour of PTFE composites against steel at cryogenic temperatures. The results showed that the friction coefficient decreases with temperature down to 77 K, but did not follow a linear evolution further down to extreme low temperatures. It can be stated that the cryogenic environment has a significant influence on the tribological performance of the polymer composites. The effect of low temperatures was more clearly detected at low sliding speed, where friction heat is reduced. A change in wear mechanism from adhesive to abrasive was observed in this case. SEM and AFM analyses showed that the PTFE matrix composites investigated under these experimental conditions have transferred material onto the disc down to very low temperatures. Chemical analyses indicate the presence of iron fluorides. (C) 2002 Elsevier Science Ltd. All rights reserved.