Oxidation and Creep Properties of Ni-Base Single Crystal Superalloy for β-Phase EQ Coating System
Oxidation and Creep Properties of Ni-Base Single Crystal Superalloy for β-Phase EQ Coating System
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β相EQ涂层体系镍基单晶高温合金的氧化和蠕变性能
DOI：
10.2320/jinstmet.70.690
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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;Toshiharu Kobayashi;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状态，抑制了合金元素在基体与涂层之间的扩散和二次反应区（SRZ）的形成。在本研究中，β相是基于其高Al含量的抗氧化EQ涂层材料的候选者。在Ni-Co-Cr-Al-Hf-Mo-Ta-W系中，通过热力学计算和能谱分析，设计了处于平衡状态的γ/γ′高温合金基体材料和γ、γ′和β相合金涂层材料。对所研制的合金进行了循环氧化试验和扩散试验，讨论了β相涂层作为EQ粘结层的适用性。对研制的γ/γ′单晶高温合金进行了蠕变强度试验。
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 secondary reaction zone(SRZ). In this study, β phase is proposed as the candidate for oxidation-resistant EQ coating material based on its high Al content. γ/γ′ superalloy for the substrate material and γ, γ′ and β phase alloys for the coating materials which are in equilibrium were designed by using thermodynamic calculation and EDX technique in Ni-Co-Cr-Al-Hf-Mo-Ta-W system. Cyclic oxidation examination and diffusion experiment for the alloys developed were performed and the suitability of the β phase coating for EQ bond coat is discussed. Creep strength property was examined for the developed γ/γ′ single-crystal superalloy.