Ablation resistance of ZrC-MoSi2/ZrC-SiC double-layered coating in a plasma flame

• DOI: 10.1016/j.corsci.2018.10.006
• Publication Date: 2018-10-09T12:08:40Z
• Authors: Tao Liu; Yaran Niu; Chong Li; Xiaohui Pan; Minhao Shi; Xuebin Zheng; Chuanxian Ding
• Keywords: Diffusion barrier

Abstract A double-layered composite coating was designed for optimizing the ablation resistance of ZrC coating, which contained external ZrC-SiC and inner ZrC-MoSi2 layers. The ablation resistance of the coating was evaluated and compared with the single-layered ZrC-SiC and ZrC-MoSi2 coatings. SiC-depleted zone and bubble burst of MoO3 were found to be the fatal defects for the ZrC-SiC and ZrC-MoSi2 coatings, respectively. For the double-layered coating, the external layer acted as oxygen diffusion barrier and the inner layer offered extra Si source for the external one. The double-layered design effectively reduced the destructive effect of SiC-depleted zone and bubble burst.