目的 通过热喷涂涂层,解决350 MW超临界机组再热第一级静叶栅的高温冲蚀问题.方法 采用超音速火焰喷涂制备了NiCr-Cr3C2涂层,测试了涂层的显微组织、孔隙率、显微硬度、结合强度及高温冲蚀性能,并对涂层在冲蚀条件下的失效机理进行分析.结果 实验室条件下,NiCr-Cr3C2涂层孔隙率为0.98％,显微硬度达到1061.2HV0.3,结合强度约为80 MPa.装机试车时,0.22 mm厚的NiCr-Cr3C2涂层可使再热第一级静叶的寿命延长3倍左右.结论 采用NiCr-Cr3C2涂层可显著延长静叶寿命,小角度粒子犁削冲蚀是涂层加速失效的主要原因.
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