Development of Oxidation-Resistant β-Phase EQ Coating System for Ni-Base Superalloys
Development of Oxidation-Resistant β-Phase EQ Coating System for Ni-Base Superalloys
复制标题
镍基高温合金抗氧化β相EQ涂层体系的开发
DOI：
10.2320/jinstmet.70.188
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发表时间：
2006
影响因子：
--
通讯作者：
H. Harada
中科院分区：
文献类型：
--
作者：
K. Kawagishi;A. Sato;H. Harada
EQ涂层是一种新型的、稳定的粘结涂层体系，它与γ/γ′基体处于热力学平衡，抑制了合金元素在基体与涂层之间的扩散和SRZ的形成。在本研究中，β相是作为抗氧化EQ涂层材料的候选人，因为它的高Al含量。在Ni-Al-Cr三元系和Ni基多元系中，形成了基体材料为γ/γ′合金，涂层材料为β合金的平衡组合。为每种组合制备扩散偶，并在1100°C下热处理300小时。分析了扩散偶中β合金与γ/γ′合金界面上合金元素的浓度分布，探讨了扩散区的存在。进行了循环氧化试验，并对氧化性能进行了讨论。
A new and stable bond coat system, EQ coating, which is in equilibrium thermodynamically with γ/γ′ substrate, suppresses the diffusion of alloying elements between the substrate and coating, and the formation of SRZ. In this study, β phase is proposed as the candidate for oxidation-resistant EQ coating material because of its high Al content. Combinations of γ/γ′ alloy for the substrate material and β alloy for the coating material which are in equilibrium were developed in Ni-Al-Cr ternary system and Ni-base multi-component system. Diffusion couples were made for each combination and were heat treated at 1100°C for 300 h. The concentration profiles of the alloying elements at the interfaces between the β alloy and γ/γ′ alloy in the diffusion couples were analyzed to investigate the existence of the diffusion zone. Cyclic oxidation examination was performed and oxidation properties were discussed.