白致铭,郭磊,梁天权,郭洪波,宫声凯

• 1:北京航空航天大学材料科学与工程学院

摘要(Abstract)：

采用电子束物理气相沉积(EB-PVD)在镍基高温合金表面制备了YSZ/NiCoCrAlY双层结构热障涂层,研究了其在熔盐环境下的等温热腐蚀行为。结果表明,涂层在加热过程中发生相变引起体积收缩,导致涂层内部产生微裂纹。熔盐填充涂层内微裂纹和柱状晶间隙,降低了涂层的应变容限,引起涂层内应力升高。同时,熔盐促使热生长氧化层(TGO)碱性溶解,产生疏松多孔的氧化物层,导致TGO层加速增厚。在热应力作用下,疏松层氧化物破碎,最终导致涂层剥落。

关键词(KeyWords)： 热障涂层;电子束物理气相沉积;熔盐;等温热腐蚀;热生长氧化层(TGO)

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划资助(2010CB631200)

作者(Author): 白致铭,郭磊,梁天权,郭洪波,宫声凯

DOI: 10.13289/j.issn.1009-6264.2011.11.024

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