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中文摘要：
研究了等离子喷涂层在不同应力水平下的接触疲劳失效模式与声发射幅值的对应关系，并分析了涂层的接触疲劳失效机理．结果表明：声发射幅值与接触应力的大小无明显的关系，根据疲劳失效时的声发射幅值可以判断涂层接触疲劳失效模式，幅值为87—93dB时易发生剥落或分层失效，幅值为78～83dB易发生点蚀失效．涂层表面微凸体与轴承球滚压接触产生黏着磨损以及涂层、磨粒、轴承球三者形成的三体磨料磨损是点蚀失效产生的主要原因．剥落失效主要与涂层表面微观缺陷处裂纹的萌生、扩展以及表面磨损行为有关．层内分层失效是由涂层内部最大剪切应力控制的，而界面分层失效主要是由涂层与基体的低结合强度、热失配以及界面剪切应力造成的．
英文摘要：
The relation of contact fatigue failure mode and acoustic emission （AE） amplitude for plasma spraying coating is investigated under different stress levels, and contact fatigue failure mechanism is analysed. The results show that contact fatigue failure mode has no obvious relation with contact stress according to AE amplitude during fatigue failure phase. Spa]ling or delamination failure tends to happen at the AE amplitude of 87 to 93 dB. Pitting failure tends to happen at the AE amplitude of 78 to 83 dB. Pitting failure is mainly caused by adhesion wear generated in rolling contact between rough salient on coating surface and bearing balls, and by three body abrasion among coating, abrasive particles and bearing balls. Spalling failure is associated with cracks initiation and growth in coating surface microdefects and surface wear behavior. Internal delamination is controlled by maximum shear stress in the coating. Interface delamination is associated with interface shear stress, lower bond strength and thermal mismatch between coating and substrate.
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