Development of New Coatings for Advanced Ni-Base Superalloys
Development of New Coatings for Advanced Ni-Base Superalloys
复制标题
先进镍基高温合金新型涂层的开发
DOI：
10.2320/jinstmet.70.192
复制
发表时间：
2006
影响因子：
--
通讯作者：
K. Kawagishi
中科院分区：
文献类型：
--
作者：
A. Sato;H. Harada;K. Kawagishi
含有高浓度难熔元素的高级镍基单晶（SC）高温合金在暴露于高温时易于在其粘结涂层下方产生称为二次反应区（SRZ）的扩散层。SRZ会导致承载截面减小，对薄壁涡轮机翼型的蠕变性能不利。在这项研究中，一种新的粘结涂层系统“EQ涂层”设计与镍基高温合金基板的热力学平衡已被提出。研究了在TMS-82+和TMS-173合金的连接线上制备的两种基于γ和γ′成分的EQ涂层系统，并与传统的粘结涂层进行了比较。每个涂层体系与基材材料扩散偶联，并在1100°C下等温暴露300小时。结果表明，在EQ涂层系统和基材之间发生了最小的相互扩散。以γ′相为主的EQ涂层具有最好的抗氧化性能。
Advanced Ni-base single crystal (SC) superalloys containing high concentrations of refractory elements prone to generate a diffusion layer called Secondary Reaction Zone (SRZ) beneath their bond coating during exposure at high temperatures. SRZ cause a reduction of the load bearing cross section and it is detrimental to the creep properties of thin-wall turbine airfoils. In this study, a new bond coat system “EQ coating” designed to be in thermodynamic equilibrium with the Ni-based superalloy substrate has been proposed. Two types of EQ coating systems based on γ and γ′ compositions on the tie line of the base alloy (TMS-82+ or TMS-173) were studied and compared with a conventional bond coat. Each coating system was diffusion coupled with the substrate material and subjected to isothermal exposure at 1100°C for 300 hours. The results have indicated minimal interdiffusion occurred between EQ coating systems and the substrate. The EQ coating based on γ′ composition possesses the most promising oxidation resistance.