A study on the thermal cyclic behavior of thermal barrier coatings with different MCrAlY roughness

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• 作者：Kang Yuan^a ; ^{bityuankang@126.com} ; Yueguang Yu^a ; Jian-Feng Wen^b ; ^c
• 关键词：MCrAlY ; TBC ; Roughness ; Thermal shock ; Thermal-ageing fatigue
• 刊名：Vacuum
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：137
• 期：Complete
• 页码：72-80
• 全文大小：4334 K
• 卷排序：137

文摘

TBCs were failed via piece-by-piece spallation of topcoat in thermal shock codnition but via peeling of the whole topcoat layer in thermal-ageing failure condition. Increasing the MCrAlY interface roughness improves the TBCs life in both test conditions. Increased MCrAlY roughness transfers fracture of TBCs from ceramic top coat to the MCrAlY interface in thermal shock. Higher MCrAlY roughness promotes larger deformation zone in the MCrAlY which may help to release some stresses in the topcoat.