SiC颗粒增强铁基合金复合涂层的组织  

Microstructure of SiC particles reinforced Fe-based alloy composite coating

作　　者：宋自力[1] 杜晓东[1] 李连颖[1] 王家庆[2] 叶诚[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽省电力科学研究院材料所,安徽合肥230009

出　　处：《材料热处理学报》2011年第12期132-137,共6页Transactions of Materials and Heat Treatment

基　　金：科技部创新基金(09C26213404170);广东省教育部产学研结合项目(2009A090100045);安徽省教育厅自然科学重点项目(KJ2009A094)

摘　　要：采用等离子堆焊—SiC后送粉技术制备了SiC颗粒增强铁基合金复合涂层,利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和能谱仪(EDS)对涂层的显微组织、相组成和元素分布进行了观察和测试。试验结果表明:SiC分布于马氏体基体上,原始形态保持完好,没有发生明显溶解,复合效果较好。SiC与基体界面层由预覆层、近基体区和絮状区构成。SiC边缘为CrSi2、CrSi3;近基体区耐腐蚀性相对基体较强,组织难以显示;絮状区由大量(Fe,Cr)7 C3、(Fe,Cr)23 C6碳化物和α-(Fe,Cr)固溶体组成。Iron-based alloy coating reinforced by precoated SiC particles was prepared by plasma surfacing process with SiC back-feeding model.SEM,XRD and EDS were used to analyse microstructure,phases and elemental distribution of the coating.The results show that the precoated SiC particles were not dissolved significantly.They retained original shape in martensitic matrix.The interface layer between SiC particles and the matrix can be divided into precoated film,near-matrix region and cotton-like region.The precoated film contains CrSi2 and CrSi3.The microstructure in the near-matrix region isn＇t easy to be indentified because of its excellent corrosion resistance.Whereas,the microstructure of the cotton-like region can be seen obviously by SEM,which is consists of α-（Fe,Cr） solid solution and a large amount of（Fe,Cr）7C3 and（Fe,Cr）23C6 carbides dispersing between α-（Fe,Cr） phase.

关 键 词：SIC 复合涂层 显微组织 界面 

分 类 号：TG455[金属学及工艺—焊接]