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中文摘要：
针对第二代单晶高温合金DD6开展了一种具有阻扩散功能的金属防护涂层的探索性研究。采用电镀和电子束物理气相沉积（EB-PVD）方法在DD6单晶高温合金上制备了NiCoCrAlY/Ru双层结构涂层,同时采用EB-PVD在单晶合金上沉积了单层NiCoCrAlY涂层。研究结果表明,在1 050℃大气环境中扩散处理300h后,涂覆单一NiCoCrAlY涂层的单晶高温合金基体中析出了厚度约为55μm的互扩散区（IDZ）以及厚度达25μm的二次反应区（SRZ）。与单一的NiCoCrAlY涂层相比,NiCoCrAlY/Ru涂覆的合金基体中只有少量的拓扑密堆相（TCP）析出。NiCoCrAlY/Ru双层结构涂层减缓了涂层中的Al元素的内扩散,有效地抑制了基体SRZ的形成。
英文摘要：
In this paper,a metallic protective coating is investigated as a diffusion barrier on the second generation single crystal superalloy DD6.A double layer of NiCoCrAlY/Ru coating is prepared by electroplating and electron beam physical vapor deposition（EB-PVD） on a sample of single crystal superalloy DD6.Also,a single NiCoCrAlY coating is deposited onto the single crystal superalloy by EB-PVD.The results show that an interdiffusion zone（IDZ） of ~55 μm and a secondary reaction zone（SRZ） of ~25 μm are formed in the superalloy after 300 h heat-treatment at 1 050 ℃ in atmospheric environment.Compared with the single NiCoCrAlY coating,the NiCoCrAlY/Ru coating effectively suppressed the formation of SRZ in the superalloy.There are only tiny amounts of topologically close-packed phases（TCP） precipitated in the superalloy.
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