Novel Experiments Reveal Scratching and Transfer Film Mechanisms in the Sliding of the PEEK/Steel Tribosystem
Novel Experiments Reveal Scratching and Transfer Film Mechanisms in the Sliding of the PEEK/Steel Tribosystem
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DOI：
10.1007/s11249-016-0732-5
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发表时间：
2016-08
影响因子：
3.2
通讯作者：
Xianqiang Pei;Leyu Lin;A. Schlarb;R. Bennewitz
中科院分区：
文献类型：
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作者：
Xianqiang Pei;Leyu Lin;A. Schlarb;R. Bennewitz
为了揭示聚合物/钢滑动副的基本摩擦学机制，经典宏观摩擦测试的销平配置被转移到专为划痕测试而设计的高分辨率摩擦计中。实验使用在钢盘上以直线单向运动模式滑动的聚醚醚酮 (PEEK) 销进行。通过每 10,000 次滑动行程中断测试来监测表面形态。 PEEK 不断变化的表面形态与钢反表面上形成的转移层相关。 PEEK 表面的划痕是由覆盖有转移层的相对钢表面的粗糙度引起的。转移层由块状聚合物材料组成，在粗糙度较低的区域带有细小的磨损碎片。这些光滑区域限制了大凹凸体的渗透，并将宏观滑动中的刮擦机制与典型的单凹凸体刮擦测试区分开来。结果揭示了由于粗糙分布而导致转移层不均匀的机制。
In order to reveal fundamental tribological mechanisms in polymer/steel sliding pairs, the pin-on-flat configuration of classical macroscopic tribotests was transferred into a high-resolution tribometer designed for scratch tests. Experiments were performed with a polyetheretherketone (PEEK) pin sliding on a steel disk in straight unidirectional movement mode. The surface morphology was monitored by interrupting the tests every 10,000 sliding strokes. The evolving surface morphology of PEEK was correlated with the transfer layer formed on steel counter surface. Scratching grooves in the PEEK surface were induced by asperities at the counter steel surface covered with transfer layers. Transfer layers were composed of lumpy polymer material accompanied by fine wear debris in areas of lower roughness. These smooth areas limit the penetration of large asperities and distinguish the scratching mechanism in macroscopic sliding from typical single-asperity scratching tests. The results reveal the mechanisms leading to inhomogeneity in the transfer layers as consequence of the asperity distribution.