Improvement in load support capability of a-C(Al)-based nanocomposite coatings by multilayer architecture
Improvement in load support capability of a-C(Al)-based nanocomposite coatings by multilayer architecture
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DOI：
10.1016/j.surfcoat.2011.07.038
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发表时间：
2011-10
影响因子：
5.4
通讯作者：
Shengguo Zhou;Liping Wang;Q. Xue
中科院分区：
文献类型：
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作者：
Shengguo Zhou;Liping Wang;Q. Xue
由于机械部件的苛刻操作条件和长寿命要求，开发具有抗磨损和高负载支撑能力的涂层是一个巨大的挑战。纳米复合防护涂层的设计是非常有前途的，并提供了一个有吸引力的替代考虑多层结构。本文采用Cr/CrN/CrCN多层结构构建了a-C（Al）基nc-TiC/a-C（Al）、nc-CrC/a-C（Al）和nc-WC/a-C（Al）纳米复合材料。系统地研究了复合涂层的显微组织、力学性能和摩擦磨损性能。结果表明：纳米复合材料以典型的纳米晶/非晶微观结构为主，具有较高的硬度、较低的内应力和较高的粘接强度；特别是，与相应的单层涂层相比，制备的nc-TiC/a-C（Al）、nc-CrC/a-C（Al）和nc-WC/a-C（Al）多层涂层在相对较高的赫兹接触压力下表现出优异的抗磨性能。制备的多层涂层摩擦磨损性能的提高主要归功于其优异的力学性能和石墨化摩擦膜的形成以及多层结构的高负载支撑能力，这表明这些涂层可能是工程应用中固体润滑材料的良好候选者。
Due to severe operating conditions and long lifetime requirements for mechanical components, the great challenge is to develop coatings with anti-wear and high load support capability. The designs for nanocomposite protective coatings are very promising and provide an attractive alternative to take into account the multilayer architecture. In this work, a-C(Al)-based nc-TiC/a-C(Al), nc-CrC/a-C(Al) and nc-WC/a-C(Al) nanocomposites were constructed by Cr/CrN/CrCN multilayer. The microstructure, mechanical properties, friction and wear behaviors for these multilayer coatings were systemically investigated. Results showed that the top-layered nc-TiC/a-C(Al), nc-CrC/a-C(Al) and nc-WC/a-C(Al) nanocomposites were dominated by typically nanocrystallite/amorphous microstructure, and these nanocomposites constructed by multilayer approach presented superior mechanical properties which possessed relatively high hardness, low internal stress as well as high adhesion strength. Particularly, the as-fabricated nc-TiC/a-C(Al), nc-CrC/a-C(Al) and nc-WC/a-C(Al) multilayer coatings exhibited superior anti-wear capability under relatively high applied Hertzian contact pressure compared to corresponding monolayer coatings. The improvement in friction and wear performances of as-fabricated multilayer coatings was mainly attributed to superior mechanical properties and formation of graphitized tribofilm as well as high load support capability by multilayer architecture, indicating that these coatings might be good candidates as solid lubrication materials in engineering applications.