某型发动机高压涡轮工作叶片表面起皮故障分析

Analysis of peeling failure on the surface of high-pressure turbine working blades of a certain engine type

  • 摘要: 某型发动机高压涡轮工作叶片为镍基单晶高温合金制造,为提高它的高温防腐蚀能力,叶片表面采用电弧离子镀技术镀覆有NiCrAlY+AlNiY复合涂层。发动机试车后叶片叶身表面出现起皮故障,经过宏观、微观检查,结合发动机分解情况,对高压涡轮工作叶片叶身表面起皮故障进行了分析,故障原因为压气机工作环内侧封严涂层磨损,脱落的涂层经过高温氧化后附着在叶片叶盆上,形成灰黑色附着物。

     

    Abstract: The working blades of a certain engine's high-pressure turbine are made of nickel-based single crystal superalloy. To enhance their high-temperature corrosion resistance, the blade surface is coated with a NiCrAlY+AlNiY composite coating using arc ion plating technology. After the engine test run, peeling occurred on the surface of the blade body. Through macroscopic and microscopic inspections, combined with the engine disassembly, an analysis was conducted on the peeling failure of the high-pressure turbine working blade surface. The cause of the failure was found to be wear and tear of the sealing coating on the inner side of the compressor working ring. The peeled coating adhered to the blade's suction side after high-temperature oxidation, forming a grayish-black deposit.

     

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