摘要
设计了FeCrAl、FeCrB两种Fe基粉芯丝材,采用XRD、OM、SEM、TEM、激光脉冲热常数测试仪、磨粒磨损试验机等对高速电弧喷涂层的微观组织结构、热导率、耐磨性进行表征,并与工程中常用的3Cr13喷涂层进行对比研究。结果表明,制备的喷涂层较致密,孔隙率低于3.3%。丝材中加入Al、B元素可有效减少涂层中氧化物的生成,而B元素具有更强的除氧效果。氧化物含量低的涂层具有较高的热导率,其中氧化物含量最低的FeCrB涂层室温热导率达8.99 W·m-1·K-1。所设计的FeCrB涂层的显微硬度达到828.3 HV0.1,相对耐磨性为3Cr13涂层的3.7倍。
Two Fe-based alloy cored wires( FeCrAl、FeCrB) were designed to prepare coatings by wire-arc spraying process.The microstructure,thermal conductivity and wear behavior of the Fe-based coatings were investigated by means of X-ray diffraction,optical microscopy,scanning electron microscopy,transmission electron microscopy,thermal conductivity test and wear test,and comparison with that of the traditional 3Cr13 coating.The results show that three coatings exhibit dense layered structure with the porosity below 3.3%.There is an obvious effect of reduction of oxides in coatings when Al or B element is added to cored wire,and B element exhibits stronger effect in deoxygenization.Meanwhile,the coating with less oxides content possesses higher thermal conductivity.The FeCrB coating with the lowest oxide content in three coatings,and its thermal conductivity is 8.99 W·m- 1·K- 1at 25 ℃.The microhardness of FeCrB coating is about 828.3 HV0.1,and its wear resistance is 3.7 times better than that of 3Cr13 coating.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第S1期226-229,233,共5页
Transactions of Materials and Heat Treatment
基金
北京工业大学先进技术基金项目(009000514312004)
关键词
Fe基粉芯丝材
高速电弧喷涂
热导率
耐磨性
Fe-based alloy cored wire
high velocity arc spraying
thermal conductivity
wear resistance
