对超音速等离子喷涂铁基涂层的接触疲劳失效机理进行了研究.使用球盘式接触疲劳试验机进行了涂层的接触疲劳实验,并通过对失效试样表面形貌的观察,总结出了涂层三种典型的失效形式,即点蚀、剥落和分层.分别研究了三种失效形式的相应的失效机理,结果表明:点蚀失效是由粗糙的表面引起的;剥落失效是由于表层与次表层的微观缺陷引起的;而分层失效则由涂层内部的剪切应力机制决定.
The contact fatigue mechanism of supersonic plasma sprayed Fe-based alloy coating was in-vestigated. The contact fatigue experiments of coating were conducted by a ball-and-disc contact fa-tigue tester. Three typical failure modes were obtained after the analysis of worn surface morpholo-gies, i.e. abrasion, spalling and delamination. And the failure mechanisms were investigated, respec-tively. The results showed that the abrasion failure is associated with asperity contact, the spalling failure is associated with micro-defects near the surface, and the delamination failure is associated with the distribution of shear stress in the coating.
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