Pack aluminization of high pressure turbine nozzle guide vane of an aero gas turbine engine has been carried out following a well defined systematic procedure. The process parameters are first optimized on dummy vanes and optimized process is followed for the actual vanes for evaluation and testing. Visual and binocular examination followed by metallurgical evaluation have been carried out to validate the process and to establish the adequacy and correctness of the coating. The coated vanes are then evaluated through engine level tests for performance and durability. The results of engine level tests and inspection post accelerated mission test cycles ensure that the vanes with aluminide coating can withstand severe engine operating cycles without any damage or failure which would otherwise would have happened without the coating. The condition of vanes post endurance test is also an indication of enhanced life of the vanes with coating.

中文翻译：

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通过包装渗铝提高航空涡轮发动机喷嘴导流叶片的寿命

航空涡轮发动机的高压涡轮喷嘴导向叶片的组件镀铝已按照明确定义的系统程序进行。首先对虚拟叶片优化工艺参数，然后针对实际叶片进行优化工艺，以进行评估和测试。已经进行了目测和双目检查，随后进行了冶金评估，以验证该工艺并确定涂层的充分性和正确性。然后，通过发动机液位测试评估涂层叶片的性能和耐用性。发动机液面测试和加速任务测试周期后检查的结果确保，涂有铝化物涂层的叶片可以承受严酷的发动机运行周期，而不会造成任何损坏或故障，而如果没有涂层则不会发生这种情况。