作　　者： (张超）; (吕成林）; (梁晨）; (庞学佳）;

机构地区： 中国船舶重工集团公司第七〇三研究所

出　　处： 《热能动力工程》 2017年第S1期57-61,129,共6页

摘　　要： 在涡轮叶片表面涂覆铝化物涂层,可显著地改善零件抗高温氧化、耐腐蚀性能,延长叶片在工况条件下的使用寿命。本文以某燃机高压涡轮叶片为研究对象,采用VPA(气相法)和CVD(化学气相沉积法)两种工艺分别制备了钴铝涂层,随后在叶片内腔涂层截面位置做了切割和试验分析,从涂层厚度及均匀性、金相组织、涂层中钴、铝含量和形成的相结构等方面进行比较研究,分析了两种工艺方法在实现钴铝涂层制备时实现技术指标的可行性和实际效果,得出了在两种涂层方法中:CVD方法不仅能很好地满足涂层厚度指标,同时也可最大限度地保证制备涂层的均匀性。相反,VPA方法不能保证空心叶片在复杂形状时内腔截面对涂层厚度均匀性的要求。 To improve high-temperature oxidation and corrosion resistance,aluminide coating can be applied to the gas turbine blade surface to prolong its working life. The high pressure turbine blades of a gas turbine were prepared using CoAl coating via VPA and CVD process,respectively. After coating was prepared,the internal channel of the blade was dissected for experimental analysis and comparative study on the coating thickness,homogeneity,metallography,content of Co and Al and phase structure. It was concluded that CVD could not only reach the coating thickness but also meet the homogeneity requirement in highest extent. On the contrary,VPA could not guarantee the coating thickness homogeneity of hollow blade with complex internal shape.

关 键 词： 气相法 涂层 涡轮叶片