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采用超音速等离子喷涂设备制备了铁基自熔剂合金涂层,通过球盘式接触疲劳试验机考察了喷涂层的疲劳行为,使用扫描电子显微镜对涂层的截面和失效形貌进行了表征,研究了不同信号响应对涂层接触疲劳失效形式的指示作用。结果表明:在该应力水平下,喷涂层的接触疲劳失效形式为点蚀和分层失效。振动和扭矩信号的响应可以反馈不同的失效过程,点蚀失效过程中信号呈现渐变的特征,而分层失效过程中信号则发生明显的阶跃。
The iron-based self-fluxing alloy coating was prepared by supersonic plasma spraying equipment. The fatigue behavior of the sprayed coating was investigated by ball-and-socket contact fatigue testing machine. The cross-section and failure morphology of the coating were characterized by scanning electron microscopy. Different signal responses indicate the failure form of the contact fatigue of the coating. The results show that under the stress level, the contact fatigue failure modes of sprayed coatings are pitting corrosion and delamination failure. The response of vibration and torque signals can feed back different failure processes, and the signal shows a gradual change during the failure of pitting corrosion. However, the signal is obviously stepped in the process of delamination failure.