Experimental study of high velocity oxy-fuel sprayed WC-17Co coatings applied on complex geometries. Part B: Influence of kinematic spray parameters on microstructure, phase composition and decarburization of the coatings
Experimental study of high velocity oxy-fuel sprayed WC-17Co coatings applied on complex geometries. Part B: Influence of kinematic spray parameters on microstructure, phase composition and decarburization of the coatings
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DOI：
10.1016/j.surfcoat.2017.09.027
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发表时间：
2017-11
影响因子：
5.4
通讯作者：
Vasileios Katranidis;S. Gu;T. Reina;E. Alpay;B. Allcock;S. Kamnis
中科院分区：
文献类型：
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作者：
Vasileios Katranidis;S. Gu;T. Reina;E. Alpay;B. Allcock;S. Kamnis
研究了超音速火焰喷涂WC-17涂层的喷涂角度、喷涂距离和喷枪横移速度对涂层组织和相组成的影响。一个实验装置，使隔离的每一个运动学参数和系统的研究，它们之间的相互作用。提出了近距离斜喷时颗粒分离和WC团反弹的机理。结果表明，小角度倾斜有利于WC在长喷距喷涂涂层中的分布。喷枪横移速度通过沉积过程中在喷涂涂层表面上形成的累积表面氧化皮影响涂层中的氧含量。金属W连续边缘被认为是吞没小飞溅，这表明发生在飞行中的结晶。
The aim of this study is to evaluate comprehensively the effect of spray angle, spray distance and gun traverse speed on the microstructure and phase composition of HVOF sprayed WC-17 coatings. An experimental setup that enables the isolation of each one of the kinematic parameters and the systemic study of their interplay is employed. A mechanism of particle partition and WC-cluster rebounding at short distances and oblique spray angles is proposed. It is revealed that small angle inclinations benefit notably the WC distribution in the coatings sprayed at long stand-off distances. Gun traverse speed, affects the oxygen content in the coating via cumulative superficial oxide scales formed on the as-sprayed coating surface during deposition. Metallic W continuous rims are seen to engulf small splats, suggesting crystallization that occurred in-flight.