WC-25Co/NiCrAlY涂层性能及其在钛合金叶片凸肩的应用

Properties of WC-25Co/NiCrAlY coating and its application in titanium alloy blade shoulder

在TC6钛合金试样上喷涂制备了NiCrAlY底层和WC-25Co面层,研究了涂层的显微组织、显微硬度、弯曲行为、结合强度、热震性能以及摩擦磨损行为。基于试验结果以某型号航空发动机的某级TC6转子叶片为例,对叶片凸肩部位进行了喷涂验证,并进行了长试考核。结果表明,该涂层综合性能良好,用于钛合金转子叶片凸肩部位,可有效发挥耐磨、减振作用,满足航空发动机使用要求。

NiCrAlY bottom layer and WC-25Co surface layer were prepared by spraying on TC6 titanium alloy specimens.The microstructure,microhardness,flexural behavior,bonding strength,thermal shock and wear behavior of the coating were studied.Based on the test results,a TC6 rotor blade of an aeroengine was taken as an example to verify the applicability of spraying coating on the blade shoulder,in particular,a long-term test evaluation of the coating was carried out.The results show that the coating has good comprehensive performance and can effectively improve the wear resistance and vibration of the shoulder of the TC6 rotor blades,meeting the requirements of aeroengines.