采用真空电弧离子镀和电子束物理气相沉积技术在高温合金DZ125上沉积NiCrAlYSi金属粘结层和YSZ陶瓷面层.研究了抛光、振动光饰、砂纸打磨及吹砂4种不同的表面处理方法对金属粘结层表面微观结构和界面状态的影响.结果表明,4种表面处理方法都改善了金属粘结层表面结构,降低了表面粗糙度.进一步探讨了表面处理对涂层结合强度的作用.结果表明,经过表面处理后的样品结合强度都得到了提高.并分析了不同表面处理方法对涂层寿命的影响,最终明确了热障涂层失效机理.
NiCrAlYSi bond coating was deposited on DZ125 alloy substrates by arc ion plating and YSZ was deposited on the bond coating by EB-PVD technology.The microstructure and interface morphology of the sandpapered (SS),polished (PS),vibratory polished (VS) and grit-blasted samples (GS) were investigated and compared.The results indicate that the four surface treatments can improve the bond coating surface and decrease the roughness.Furthermore,effects of surface treatments on bond strength were studied.It is shown that surface treatments increase the bond strength.The durability of these systems by different surface treatments was also measured.Based on the electron microscopy observations,the failure mechanisms of thermal barrier coatings were also investigated by the various stages of cycle life.
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