Protectiveness of Pt and Gd2Zr2O7 layers on EB-PVD YSZ thermal barrier coatings against calcium-magnesium-alumina-silicate (CMAS) attack
Protectiveness of Pt and Gd2Zr2O7 layers on EB-PVD YSZ thermal barrier coatings against calcium-magnesium-alumina-silicate (CMAS) attack
复制标题
EB-PVD YSZ 热障涂层上的 Pt 和 Gd2Zr2O7 层对钙镁铝硅酸盐 (CMAS) 攻击的防护能力
DOI：
10.1016/j.ceramint.2015.05.128
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发表时间：
2015
影响因子：
5.2
通讯作者：
Guo Hongbo
中科院分区：
文献类型：
--
作者：
Wang Lu;Guo Lei;Li Zhuomin;Peng Hui;Ma Yue;Gong Shengkai;Guo Hongbo
热障涂层（TBC）易受以钙镁铝硅（CMAS）为主的环境沉积物的影响而发生失效。在这项工作中，退化的电子束物理气相沉积（EB-PVD）氧化钇稳定氧化锆（YSZ）TBC由于CMAS攻击进行了研究。为了保护YSZ涂层，分别通过电镀和EB-PVD在YSZ涂层表面沉积Pt膜和Gd 2 Zr 2 O 7（GZO）层。在1250 °C下对涂层进行4 h的CMAS沉积热处理，并研究了CMAS侵蚀后涂层的微观结构和化学成分。在YSZ涂层上电镀一层致密无缺陷的Pt膜可以有效地防止CMAS的侵蚀，而EB-PVD GZO涂层不能防止熔融CMAS的渗透，主要是由于大的柱间间隙。并对相关机理进行了详细讨论。
Thermal barrier coatings (TBCs) are susceptible to degradation caused by environmental deposits mainly composed of calcium–magnesium–aluminum–silicon (CMAS). In this work, the degradation of electron beam physical vapour deposition (EB-PVD) yttria stabilized zirconia (YSZ) TBC due to CMAS attack was investigated. To protect the YSZ coating, a Pt film and a Gd2Zr2O7(GZO) layer were deposited onto the YSZ coating surface by electroplating and EB-PVD, respectively. The coatings were heat treated at 1250 °C for 4 h with CMAS deposits, and their microstructure and chemical composition after CMAS attack were investigated. Electroplating a dense and defect-free Pt film on YSZ coating could provide effective protection from CMAS attack, but EB-PVD GZO coating was unable to prevent molten CMAS infiltration, mainly due to the large inter-columnar gaps. The associated mechanisms were discussed in detail.