超临界锅炉管道耐磨涂层的微观组织结构及冲蚀规律  

Microstructure and Erosional Behavior of Erosion-Resistant Coatings of Super-Critical Boiler Pipes

作　　者：刘少光[1] 吴进明[1] 张升才[1] 胡小海[1] 荣淑杰[1] 李志章[1] 

机构地区：[1]浙江大学材料系,杭州310027

出　　处：《动力工程》2006年第6期908-912,共5页Power Engineering

基　　金：浙江省科技厅项目<超临界锅炉抗高温冲蚀覆层强化材料>资助

摘　　要：开发两种适用于超临界锅炉管道防磨的含TiAl3(AW1)、Cr3C2(AW2)的复合粉芯丝材,采用超音速电弧喷涂技术制取耐磨涂层,结合光学显微镜、维氏硬度、X射线衍射、场发射扫描电子显微镜、能谱分析等分析方法对喷涂层的的微观组织结构和高温冲蚀磨损规律进行研究,并与20钢进行对比分析。结果表明:AW1、AW2涂层具有固溶体相和氧化物相相互间隔的叠层结构特点;经800°C1、50 h氧化试验,AW1和AW2涂层的抗氧化性能分别是20钢的10倍和15倍;20钢、AW1和AW2涂层的最大冲蚀率分别出现在15°和45°冲蚀角附近;AW1涂层具有与商用AW2涂层接近的耐高温冲蚀性能,耐冲蚀性能明显优于20钢;当冲蚀角为45°时,AW1和AW2涂层的耐冲蚀性分别是20钢的3.1和3.0倍。Two kinds of wire, core-charged with composite TiAl （AW1） and Cr3C： （AW 2） powder, have been developed to be used for building up corrosion-resistant coatings of super-critical boiler pipes, by means of supersonic arc-spraying technique. Coating＇s microstructure and its Erosional behavior under high temperature conditions have been studied and compared with those of steel 20 by using optical microscopy, Vicker-Hardness measurements, X-ray refraction observation, scanning electron microscopy and energy dispersion spectrum analysis. Results show that both AW 1 and AW2 coating are structurally featured by consisting of successive layers, alternatively containing solid solution phases and oxide phases Experimental results show that, after having been exposed to a 800℃ oxidation test, lasting 150 hrs, the oxidation resistance capability of AW1 and AW2 are respectively 10 and 15 times that of steel 20; the coating＇s erosion rates of steel 20, AW1 and AW2 all attained a maximum when the erosion attack angle is around 15° or 45°; the erosion resistances of AW1 and AW2 are found respectively to be 3.1 to 3.0 times that of steel 20.

关 键 词：材料科学 锅炉管道 耐磨涂层 高温冲蚀磨损 抗氧化性能 

分 类 号：TG174[金属学及工艺—金属表面处理]