刘胜利,宋冠禹,高峰,高畅,宋光雄

• 1:国电长源电力股份有限公司
• 2:华北电力大学能源动力与机械工程学院
• 3:有色金属技术经济研究院有限责任公司
• 4:国电青山热电有限公司

摘要(Abstract)：

通过纳米压痕仪测试了热障涂层(TBCs)在1050℃热循环不同时间后的弹性模量和硬度,从微观层面了解其高温力学性能变化。采用X射线衍射仪(XRD)和扫描电镜(SEM)等对涂层的物相和形貌进行了分析。结果表明:采用纳米压痕仪测得Y_2O_3部分稳定的ZrO_2(YSZ)陶瓷层的弹性模量(E_i)在80～170 GPa之间,硬度在2.6～5.8 GPa之间。陶瓷层的硬度和弹性模量均随热循环时间增加而增加,在热循环初期,涂层的强度稍高,随着热循环时间的增加,涂层的强度减小,韧性变得更好。热循环后期,涂层的强度最大。同时,随着热循环时间的增加,划痕形貌发生了明显的变化。热障涂层的失效分析表明:由于氧化循环次数增加,YSZ发生了烧结,在热循环作用下样品内部的内应力升高,产生横向裂纹,从而导致柱状晶结构发生破坏而产生失效。

关键词(KeyWords)： 热障涂层;微纳米压痕/划痕;热循环;YSZ

Abstract:

Keywords:

基金项目(Foundation): 国电长源电力股份有限公司和国电青山热电有限公司联合资助

作者(Author): 刘胜利,宋冠禹,高峰,高畅,宋光雄

DOI: 10.13289/j.issn.1009-6264.2021-0271

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