The role of carbon fibers and silica nanoparticles on friction and wear reduction of an advanced polymer matrix composite
The role of carbon fibers and silica nanoparticles on friction and wear reduction of an advanced polymer matrix composite
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DOI：
10.1016/j.matdes.2015.12.175
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发表时间：
2016-03-05
影响因子：
8.4
通讯作者：
Jim, B. C.
中科院分区：
文献类型：
--
作者：
Oesterle, W.;Dmitriev, A. I.;Jim, B. C.
通过微米级和纳米级填料的组合，获得了先进聚合物基复合材料的优异摩擦学性能。摩擦膜的表面特征和纳米结构通过先进的微观技术进行表征，并与磨损率和摩擦演化方面的宏观行为相关。应用基于可移动元胞自动机的模型来更好地理解纳米结构摩擦膜的滑动行为。不含二氧化硅纳米粒子的传统复合材料的失效可能归因于最初形成的聚合物转移膜降解后的严重氧化磨损。这种混合复合材料保留了其抗磨损和减摩性能，因为微米级碳纤维的闪蒸温度会导致聚合物降解并随后释放纳米颗粒。研究表明，释放的颗粒与其他磨损产物混合，并在磁盘表面形成稳定的薄膜，从而防止进一步严重的氧化磨损。此外，释放的磨损产品还在复合材料表面嵌入碳纤维，从而防止纤维断裂和随后的第三体磨损。通过纳米级建模，我们能够证明，如果纳米结构二氧化硅薄膜含有至少 10 vol.% 的软成分，则可以预期低摩擦和磨损。 (C) 2016 Elsevier Ltd. 保留所有权利。
Excellent tribological properties of an advanced polymer matrix composite were obtained by a combination of micro- and nano-sized fillers. Surface features and the nanostructure of tribofilms were characterized by advanced microscopic techniques, and correlated with the macroscopic behavior in terms of wear rate and friction evolution. A model based on movable cellular automata was applied for obtaining a better understanding of the sliding behavior of the nanostructured tribofilms. The failure of the conventional composite without silica nanoparticles could be attributed to severe oxidational wear after degradation of an initially formed polymer transfer film. The hybrid composite preserves its antiwear and antifriction properties because flash temperatures at micron-sized carbon fibers, lead to polymer degradation and subsequent release of nanoparticles. It has been shown that the released particles are mixed with other wear products and form stable films at the disk surface thus preventing further severe oxidational wear. Furthermore, the released wear product also is embedding carbon fibers at the composite surface thus preventing fiber fragmentation and subsequent third body abrasion. With nanoscale modeling we were able to show that low friction and wear can be expected if the nanostructured silica films contain at least 10 vol.% of a soft ingredient. (C) 2016 Elsevier Ltd. All rights reserved.