Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites
Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites
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DOI：
10.3390/lubricants7090075
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发表时间：
2019-09-01
期刊：
影响因子：
3.5
通讯作者：
Suarez, Sebastian
中科院分区：
文献类型：
--
作者：
Aristizabal, Katherine;Tayrac, Alexandra;Suarez, Sebastian
采用固相法制备了镍(Ni)和碳纳米管(CNT)增强镍基复合材料，并对其进行了高压扭转变形。采用往复滑动的方法进行了微观摩擦学试验，考察了其摩擦行为。用能量色散X射线能谱(EDS)、扫描电子显微镜(SEM)和聚焦离子束(FIB)研究了摩擦化学成分和微观结构的变化。碳纳米管的润滑性受阻于较大的晶界区域促进的稳定氧化层的持续形成，以及在HPT过程中对增强体的不可逆损伤，从而控制了研究样品的摩擦行为。碳纳米管的存在在一定程度上降低了接触区的摩擦氧化活性，并显著硬化和稳定了组织，从而降低了磨损。
Nickel (Ni) and carbon nanotube (CNT)-reinforced Ni-matrix composites were manufactured by solid state processing and severely deformed by high-pressure torsion (HPT). Micro-tribological testing was performed by reciprocating sliding and the frictional behavior was investigated. Tribo-chemical and microstructural changes were investigated using energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and focused ion beam (FIB). The CNT lubricity was hindered due to the continuous formation of a stable oxide layer promoted by a large grain boundary area and by irreversible damage introduced to the reinforcement during HPT, which controlled the frictional behavior of the studied samples. The presence of CNT reduced, to some extent, the tribo-oxidation activity on the contact zone and reduced the wear by significant hardening and stabilization of the microstructure.