Influence of Si Content on Microstructure, Mechanical Properties and Tribological Properties of VAlSiN Coatings
WANG En-qing1,2, YUE Jian-ling1,3, LI Miao-lei1, LI Dong2, HUANG Feng2
1. School of Aeronautics and Astronautics, Central South University, Changsha 410083, China;
2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract：VAlSiN coatings with different Si contents were deposited at 300℃ by reactive magnetron sputtering. The effect of Si content on the microstructure, growth morphology,chemical state, mechanical properties,friction and wear properties was investigated. The results show that the VAlN coating exhibits a single-phase NaCl structure with (111) preferred orientation. The VAlSiN coatings gradually lose their structure of (111) preferred orientation and transfer into amorphous structure with the increase of Si content. The VAlSiN coatings which Si content is more than 1.8% (atom fraction,same as below) are multi-phase composite coatings consisting of nc-VAlN and a-Si3N4. Compared to VAlN coating, the density of VAlSiN coatings with small amount of Si (0.8%) is increased significantly as well as the hardness that reaches 30.1GPa,while the grain size is decreased. Further increasing Si content, the growth of columnar grains is interrupted, concomitant of the hardness gradually declines and tends to be stable at 22GPa. The friction coefficient of the VAlSiN coatings decreases first and then increases with the increase of Si content. The wear rate reaches the lowest value of 1.2×10-16 m3·N-1·m-1 is obtained when Si content is 0.8%.
王恩青, 岳建岭, 李淼磊, 李栋, 黄峰. Si含量对VAlSiN涂层微结构、力学性能和摩擦磨损性能的影响[J]. 材料工程, 2017, 45(4): 70-76.
WANG En-qing, YUE Jian-ling, LI Miao-lei, LI Dong, HUANG Feng. Influence of Si Content on Microstructure, Mechanical Properties and Tribological Properties of VAlSiN Coatings. Journal of Materials Engineering, 2017, 45(4): 70-76.
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