Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings
Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings
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DOI：
10.1007/s11666-019-00831-x
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发表时间：
2019-01
影响因子：
3.1
通讯作者：
Vasileios Katranidis;S. Kamnis;B. Allcock;S. Gu
中科院分区：
文献类型：
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作者：
Vasileios Katranidis;S. Kamnis;B. Allcock;S. Gu
粒子冲击的状态（速度和温度）对涂层的显微组织、力学性能和磨损性能有重要影响。喷雾间距和喷雾角度决定了颗粒速度分量和温度的影响。本文旨在深入研究HVOF喷涂WC-17 Co涂层的滑动磨损性能及其磨损机理。干滑动耐磨性进行了评价，通过销盘试验，并观察到喷涂参数之间的显着相互作用。大量的实验，在一个全因子的方式提供了深入了解渐进的摩擦膜积累和磨损损坏模式，并允许提出有关其发生的机制。在长距离的正常喷涂角度的小偏差被证明是有益的涂层的磨损性能。最高的摩擦系数和最积极的磨损损伤中观察到的涂层与丰富的覆盖面的磨损轨道与摩擦膜。涂层的相组成被证明是在磨损性能的主要贡献者。
The state of particle impact (velocity and temperature) significantly affects the coating’s microstructural, mechanical properties and wear performance. The spray stand-off distance and spray angle dictate particle velocity components and temperature at impact. This work aims in advancing the understanding of their effect and interplay in regard to the sliding wear performance as well as the mechanisms of wear themselves of HVOF-sprayed WC-17Co coatings. Dry sliding wear resistance was evaluated by a pin-on-disk test, and significant interplay between the spray parameters was observed. A large number of experiments in a full-factorial manner provided insights into the progressive tribofilm build-up and wear damage modes and allowed for proposing mechanisms regarding their occurrence. Small deviations from the normal spray angle at long stand-off distances proved to be beneficial for the wear performance of the coatings. The highest friction coefficient and most aggressive wear damage were observed in coatings with a rich coverage of the wear track with a tribofilm. The phase composition of the coatings proved to be the principal contributor in the wear performance.