胡滨,胡芳友,管仁国,黄旭仁,卢长亮

• 1:海军航空工程学院青岛校区
• 2:东北大学材料与冶金学院

摘要(Abstract)：

采用激光熔覆定向凝固技术修复损伤定向凝固涡轮叶片,研究熔覆层在1000℃高温下的热震性能。自配粉末1和粉末2制备熔覆层进行对比。热震实验结果表明:粉末2熔覆层抗冷热冲击性能优于粉末1熔覆层;366次热震实验后,粉末1熔覆层组织开裂,基本剥离基体,熔覆层失效;404次热震实验后,粉末2熔覆层部分剥离基体,熔覆层内部分布着细小的裂纹,多数裂纹平行于结合带方向,熔覆层失效;熔覆层失效首先是由于熔覆层与基体结合带产生裂纹;熔覆层内部产生裂纹大多产生于层与层之间的过渡区域;为提高涂层抗冷热冲击性能,应减小熔覆层与基体的热膨胀系数差异,采用合适的工艺参数,减小层与层之间的横向应力,保证多层熔覆层之间的良好过渡。

关键词(KeyWords)： 定向凝固;热震;激光熔覆;热膨胀系数;热应力

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金项目(20110491882);; 国家优秀青年科学基金项目(51222405);; 国家自然科学基金重点项目(51034002)

作者(Author): 胡滨,胡芳友,管仁国,黄旭仁,卢长亮

DOI: 10.13289/j.issn.1009-6264.2013.s1.029

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