摘要
该文采用超音速火焰喷涂方法,在镍基高温合金基体上制备NiCoCrAlTaY粘结层,通过XRD、SEM分析方法,研究了相同温度不同氧化时间粘结层的抗高温氧化行为及氧化机理,分析计算得到粘结层的氧化动力学规律,最后总结了控制TGO生长的方法。分析表明:TGO的生长使粘结层内Al元素贫化,Ni、Cr元素氧化产生复杂的尖晶石类金属氧化物,是粘结层抗氧化性能降低的根本原因,为热障涂层的结构设计及优化提供了依据。
NiCoCrAlTaY bond coatings are prepared on nickel-basic high-temperature alloy by HVAF in this paper, XRD and SEM are applied to analysis on inoxidizable performance and oxidation mechanism of bond coat at high temperature, the oxidation kinetics law are found, the methods of control ling the grown rate of TGO are obtained. The results show that the growth of TGO leads to be lack of aluminum, nickel and chromium elements are oxidated into metal oxides which are of spinel type. Metal oxides is the ultimate reason which makes the inoxidizable performance be worse. According to the analysis, the structure of thermal barrier coatings can be optimized.
出处
《东方汽轮机》
2011年第2期71-75,共5页
Dongfang Turbine
关键词
热障涂层
粘结层
抗高温氧化
热生长氧化膜
thermal barrier coatings, bond coat, high temperature oxidation resistance, thermally grown oxide
