为了研究YSZ热障涂层在热腐蚀环境下的服役情况,采用等离子喷涂工艺在K38高温合金基体上分别制备了Y_2O_3稳定的ZrO_2(YSZ)热障涂层和MgO稳定的ZrO_2热障涂层(MSZ),利用热重分析、X-射线衍射和带能谱的扫描电镜等手段,研究分析了这2种涂层在850℃含氯硫酸盐膜下的热腐蚀行为.结果表明:MSZ涂层在850℃热腐蚀时发生了相变,引起陶瓷外层开裂和剥落,影响了涂层的抗高温性能和使用寿命;而YSZ涂层在850℃腐蚀后没有相变发生,表现出了比MSZ涂层更佳的抗热腐蚀性能.
In order to investigate the service condition of YSZ coating under the hot corrosion environment, a yt-tria-stabilized zirconia TBC and a magnesia-stabilized zirconia (MSZ) TBC were prepared over a NiCrAlY bond coating on the K38 superalloy substrate by an air plasma spraying (AIP) technique, respectively. Hot corrosion behaviors of two coatings were investigated by thermogravimetry analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy with an energy-dispersive X-ray analysis attachment (SEM/EDS). The results show that the phase transformation formed in the outer layer of the MSZ coating after hot corrosion at 850℃ leads to the cracking and spalling of the coating, which impairs the high temperature property and service life of the coating; Compared with the MSZ coating,the YSZ coating has superior hot corrion resistance due to no phase transformation appearing in the coating at 850℃.
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