摘要
针对汽轮机通流部件冲蚀损伤机理,采用超音速火焰喷涂制备了NiCr和WC-Co金属陶瓷涂层,研究分析了不同涂层的组织结构、机械性能、热震性能、磨粒磨损及冲蚀磨损性能,探讨了2种涂层的磨粒磨损机理及冲蚀磨损机理。研究结果表明,超音速火焰喷涂制备的NiCr金属陶瓷涂层结合强度为70 MPa,孔隙率为0.5%,涂层致密。NiCr和WC-Co金属陶瓷涂层表现出相近的磨粒磨损和冲蚀性能,与2Cr13基体材料相比其抗磨损和冲蚀性能均得到显著提高。但是经过80次540℃的热循环后,NiCr金属陶瓷涂层保持完好,无明显开裂,而WC-Co涂层热循环后涂层发生明显的开裂失效。因此NiCr金属陶瓷涂层能够作为耐水蚀、耐固体颗粒侵蚀涂层应用在汽轮机通流部件上,显著提高通流部件抗冲蚀性能,有利于延缓通流部件使用寿命,具有广阔的应用前景。
Based on the mechanism of erosion damage in the flow passage components in steam turbine, the supersonic oxygen-fuel sprayed （HVOF） NiCr and WC-Co cermet coatings were used, and the microstructure, mechanic properties, thermal shocking behavior, abrasive wear and erosion behaviors of both HVOF coatings were tested and analyzed. The research result indicated that the HVOF NiCr cermet coating exhibited an adhesive strength of 70 MPa and a porosity of 0.5%. Compared with the 2Cr13 substrate material, the NiCr and WC -Co cermet coatings showed a higher anti-erosion and anti-abrasive wear behavior. After 80 times thermal circulations, NiCr cermet coating was in good condition, and WC -Co cermet coatings cracked into uselessness. So using the NiCr cermet coating, the anti-ernsion and anti-abrasive wear behavior of the flow passage components in steam turbine were improved remarkably, and the lifetime of the flow passage components was extended. The NiCr cermet coating has a wide application prospect.
出处
《中国电力》
CSCD
北大核心
2010年第12期40-45,共6页
Electric Power
基金
中国华能集团科技项目(HNKJ06-G22)
