汽轮机通流部件防固体颗粒侵蚀碳化铬涂层的研制及应用

Preparation and Application of Solid Particle Erosion Prevention Cr_3C_2-NiCr Coating on Steam Turbine Flowing Parts

为了开发新一代用于汽轮机通流部件的防固体颗粒侵蚀技术,采用超音速火焰喷涂方法制备了碳化铬防固体颗粒侵蚀涂层,并对碳化铬涂层进行了金相组织、硬度、结合强度、抗微粒冲蚀性能分析。结果表明:碳化铬涂层组织均匀、致密,孔隙率小于1%;涂层显微硬度达738~980 HV;结合强度平均值达65 MPa以上;抗冲蚀性能是基体材料的1.6倍。对超超临界机组组焊导叶片(隔板静叶)喷涂碳化铬涂层组织与性能进行了分析,最终通过开发独创性的工装及喷涂程序,将碳化铬涂层应用于多台份660 MW、1 000 MW等级火电机组通流部件。

Cr3C2- NiCr solid particle erosion prevention coatings were prepared by high velocity air fuel （HVAF）. The micro-structure, hard- ness, bonding strength and particle erosion resistance property were analyzed. Results showed that the micro-structure of Cr3 C2- NiCr coatings with porosity ratio less than 1% was consistent and dense; the coating hardness range was 738-980 HV and the average bonding strength was larger than 65 MPa; and the erosion capability was 1.6 times that of base materials. Micro- structure and property of coatings of vane compo- nents on the supercritical steam turbine were analyzed and a tool and spray programs were originally designed, by which Cr3 C2- NiCr coatings were applied into the flowing parts of many steam turbines of 660 MW and 1 000 MW grade.