超音速火焰喷涂含铝或锌中间层的YSZ热障涂层

在镁合金基底表面直接制备热障涂层,涂层的耐蚀性较差。采用超音速火焰喷涂法在镁合金基底和热障涂层之间分别制备了Al涂层和Zn涂层。通过XRD,SEM和EDS对涂层进行物相、微观结构和点扫描元素分析,采用电化学工作站对Al涂层试样和Zn涂层试样进行耐腐蚀性分析,同时研究了含Al中间层和含Zn中间层的热障涂层的抗热震性能。结果表明:Al涂层表面粗糙度(10.237±0.527μm)大于Zn涂层表面粗糙度(7.171±0.488μm),且喷涂过程中仅有轻微氧化。Al涂层试样的耐腐蚀性优于Zn涂层试样。含Zn中间层的热障涂层具有更好的抗热震性能。

YSZ Thermal Barrier Coatings on Magnesium Alloy with HVOF Sprayed Aluminum or Zinc Interlayer

Thermal barrier coating prepared directly on magnesium alloy substrate surface has poor corrosion resistance.In this paper,Al coating and Zn coating were prepared by high velocity oxy-fuel(HVOF)between magnesium alloy substrate and thermal barrier coatings(TBCs),respectively.XRD,SEM and EDS were used to analyze the phase,microstructure and point scanning elements of the coating.Electrochemical work station was used to analyze the corrosion resistance of Al coating sample and Zn coating sample.Meanwhile,the thermal shock resistances of the thermal barrier coating containing Al interlayer and Zn inter layer were studied.The results showed that the surface roughness of Al coating(10.237±0.527μm)is larger than that of Zn coating(7.171±0.488μm),and there is only slight oxidation in the spraying process.The corrosion resistance of Al coating sample is better than that of Zn coating sample.The thermal barrier coatings with Zn intermediate layer has better thermal shock resistance.