Effects of potassium titanate whiskers and carbon fibers on the wear behavior of polyetheretherketone composite under water lubricated condition
Effects of potassium titanate whiskers and carbon fibers on the wear behavior of polyetheretherketone composite under water lubricated condition
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DOI：
10.1016/j.compscitech.2011.01.019
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发表时间：
2011-04
影响因子：
9.1
通讯作者：
G. Xie;G. Sui;Ren-fu Yang
中科院分区：
文献类型：
--
作者：
G. Xie;G. Sui;Ren-fu Yang
采用销-盘结构，研究了水润滑条件下碳纤维（CF）和钛酸钾晶须（PTW）增强聚醚醚酮（PEEK）复合材料在不同载荷下的摩擦学行为。讨论了微米碳纤维和亚微米PTW对混杂复合材料磨损性能的影响。结果表明，PEEK/PTW/CF复合材料在水介质中具有良好的摩擦学性能。在较宽的载荷范围内获得了高的耐磨性和低的摩擦系数。结果表明，这两种填料协同工作，以提高混杂增强PEEK复合材料的耐磨性。碳纤维在接触表面之间承载主要载荷，并保护基体免受配对物的进一步严重磨损。同时，PTW暴露在纤维周围的聚合物基体外，在一定程度上抑制了纤维边缘与对应尖端之间的直接刮擦，使得纤维在随后的滑动过程中受到较少的直接冲击，从而保护纤维免受严重损伤。此外，PTW对PEEK的增强作用可以减少碳纤维-基体界面上的应力集中，从而减少CF的失效/损坏。PTW对PEEK的增强作用也可能限制复合材料表面和亚表面的裂纹萌生和扩展，从而保护基体在滑动过程中免受疲劳破坏。
The tribological behaviors of polyetheretherketone (PEEK) composite reinforced by carbon fiber (CF) and potassium titanate whiskers (PTW) have been investigated using the pin-on-disk configuration at different applied loads under water lubricated condition. The effects of micrometer carbon fiber and sub-micrometer PTW on the wear properties of the hybrid composite have been discussed. It was found that the PEEK/PTW/CF composite showed excellent tribological performance in water condition. High wear resistance and low friction coefficient were achieved under a wide range of loads. It was revealed that the two fillers worked synergetically to enhance the wear resistance of the hybrid reinforced PEEK composite. The carbon fiber carried the main load between the contact surfaces and protected the matrix from further severe abrasion of the counterpart. At the same time, the exposed PTW out of the polymer matrix around the fiber inhibited the direct scraping between the fiber edge and counterpart tip in some degree, so that the fibers could be less directly impacted during the subsequent sliding process and they were protected from severe damage. In addition, the reinforcement effect of PTW on PEEK could reduce the stress concentration on the carbon fiber–matrix interface, and thereby reduce the CF failure/damage. The reinforcement effect of PTW on PEEK might also restrict the crack initiation and propagation on the surface and subsurface of the composite, and therefore to protect the matrix from fatigue failure during the sliding process.