等离子喷涂复合热障涂层的静态氧化行为

Behavior of Static Oxidation of Plasma Sprayed Al_2O_3+ZrO_2 Composite Thermal Barrier Coatings

采用等离子喷涂方法 ,在 GH536高温合金基材上制备了传统的双层热障涂层 ( TBCs)和两种含有 Al2 O3与 Zr O2 陶瓷复合层的三层热障涂层 .传统 TBCs结构为 Ni2 2 Cr1 0 Al Y合金连接层和 8% Y2 O3部分稳定的Zr O2 陶瓷顶层 ;三层 TBCs分别采用了置于陶瓷层内侧及外侧的 Al2 O3复合层 .三种类型试样的 1 0 0 h、1 0 50℃静态氧化试验结果表明 :三层涂层较双层涂层的氧化阻力提高 ,双层涂层的氧化阻力最差 .不同复合层形式试样氧化动力学曲线不同 ,内置复合层的氧化增重最小 ,氧化阻力最佳 .1 0 50℃是氧化增重的临界点 ,外置复合层试样的氧化增重出现明显增加趋势 .

Three type of plasma sprayed(PS) thermal barrier coatings(TBCs) on GH536 superalloy substrate with different layer of Ni22Cr10AlY,ZrO 2 8wt pct Y 2O 3(8YPSZ),and composite layer of 8YPSZ+Al 2O 3 are prepared.The static oxidation test at 1 000℃ and 1 050℃ are conducted to evaluate the oxidation kinetics of the TBCs.It is indicates that the higher oxidation resistance is obtained by using of composite 8YPSZ+Al 2O 3 ceramic layer, and compared with 8YPSZ+Al 2O 3 composite layer, the TBCs with the inner 8YPSZ+Al 2O 3 composite layer is of the better oxidation resistance.