Friction and Wear Behavior of CrN Coating on 316L Stainless Steel in Liquid Sodium at Elevated Temperature
Friction and Wear Behavior of CrN Coating on 316L Stainless Steel in Liquid Sodium at Elevated Temperature
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316L不锈钢表面CrN涂层在液态钠中的高温摩擦磨损行为
DOI：
10.1016/j.triboint.2019.106079
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发表时间：
2020-03-01
影响因子：
6.2
通讯作者：
Wang, Liping
中科院分区：
文献类型：
--
作者：
Chen, Yanjun;Wang, Shunhua;Wang, Liping
CrN涂层作为一种硬质涂层，有望应用于钠冷快堆部件。金属材料与液体钠的相容性研究已有报道，但对材料在液体钠中的摩擦学性能研究较少。本研究首先利用自制的往复式摩擦磨损试验机，分别在250 ℃和550 ℃下研究了316L不锈钢表面CrN涂层在液态钠中的摩擦磨损行为。采用扫描电镜（SEM）、能谱仪（EDS）和X射线光电子能谱仪（XPS）对摩擦磨损后的CrN涂层表面进行了分析。结果表明，与室温Ar气氛下CrN涂层的摩擦相比，250 ℃下液态钠对CrN涂层的摩擦性能有积极影响，其摩擦系数低至0.2，这主要归因于钠中的氧化物杂质与涂层发生化学和摩擦化学反应形成润滑氧化层。但由于液态钠在550 ℃时能很好地润湿CrN涂层，在一定程度上减少了氧化物杂质与CrN涂层的接触，导致摩擦系数增加。该研究为在液体钠环境中使用的涂层设计提供了指导。
CrN coating, as a hard coating, could be hopefully applied to components in sodium-cooled fast reactor. Some studies on compatibility of metallic materials with liquid sodium have been reported, but little about tribological properties of materials in liquid sodium. In this study, the friction and wear behavior of CrN coating on 316L stainless steel surface in liquid sodium was first studied using self-made reciprocating-type tribometer at 250 degrees C and 550 degrees C, respectively. The worn surfaces of CrN coatings after friction tests were analyzed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that compared with the friction of CrN coating in Ar atmosphere at room temperature, liquid sodium had a positive effect on friction performance of CrN coatings at the temperature of 250 degrees C, and the friction coefficient is as low as 0.2, which is mainly attributed to the lubricating oxide layer formed by the chemical and tribochemical reactions between the oxide impurities in sodium and the coating. However, since liquid sodium can well wet CrN coating at 550 degrees C, it can reduce the contact between oxide impurities and CrN coating to a certain extent, resulting in increase of friction coefficient. This study provides guidance for the design of coatings served in the liquid sodium environment.