Development of NiCrAlY Alloys for Corrosion-Resistant Coatings and Thermal Barrier Coatings of Gas Turbine Components
Development of NiCrAlY Alloys for Corrosion-Resistant Coatings and Thermal Barrier Coatings of Gas Turbine Components
复制标题
燃气轮机部件耐腐蚀涂层和热障涂层用 NiCrAlY 合金的开发
DOI：
10.1115/1.2883719
复制
发表时间：
1999
影响因子：
1
通讯作者：
L. Singheiser
中科院分区：
文献类型：
--
作者：
H. Nickel;D. Clemens;W. Quadakkers;L. Singheiser
提高能量转换系统的效率和功率输出的需求导致了现代陆上燃气轮机的燃气入口温度的提高。由此引起的部件表面温度的升高导致叶片涂层的氧化侵蚀增强，在固定燃气轮机中，叶片涂层通常是MCrAlY(M=Co和/或Ni)类型。为了改善MCrAlY涂层的高温性能，人们在添加少量合金元素方面做了大量的工作。本文研究了系统成分变化对MCrAlY涂层防护性能的影响，特别是Y、硅和钛的添加。采用低压等离子喷涂技术在钢基材上进行了涂层的制备。然后，独立的MCrAlY-Body是来自涂层的机器。在950℃~1100℃温度范围内进行了恒温氧化和循环氧化试验。利用光学显微镜、电子显微镜和二次中性质谱(SNMS)对涂层和腐蚀产物进行了表征，研究了钛和硅含量的系统变化对氧化和组织稳定性的影响。
The demand for improved efficiency and power output of energy conversion systems has lead to an increase of gas inlet temperatures in modern land-based gas turbines. The resulting increase of component surface temperature leads to an enhanced oxidation attack of the blade coating, which, in stationary gas turbines, is usually of the MCrAlY (with M = Co and/or Ni) type. Considerable efforts have been made in the improvement of the high temperature properties of MCrAlY coatings by additions of minor alloying elements. In the present paper, the effect of systematic composition variations, especially yttrium, silicon, and titanium additions, on the protective properties of MCrAlY coatings are presented. The coatings were applied to a steel substrate by low-pressure plasma spraying. Then, free-standing MCrAlY-bodies were machines from the coating. Isothermal and cyclic oxidation tests were carried out in the temperature range 950 C--1,100 C. The effect of systematic variation of titanium and silicon contents on oxidation and microstructural stability was studied by characterization of the coating and the corrosion products using light and electron optical microscopy and by secondary neutrals mass spectrometry (SNMS).