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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。
SiC particle reinforced iron-based alloy composite coating was prepared by plasma surfacing-SiC carrier powder coating. The microstructure of the coating was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) Tissue, phase composition and elemental distribution were observed and tested. The experimental results show that: SiC is distributed on the martensite matrix, the original morphology remains intact, no significant dissolution occurs, and the composite effect is better. SiC and matrix interface layer by the pre-coating, near the base area and flocculent zone composition. The edge of SiC is CrSi2 and CrSi3. The corrosion resistance of the near matrix region is relatively strong and the microstructure is difficult to be displayed. The floccules are composed of a large amount of (Fe, Cr) 7 C3, (Fe, Cr) Cr) solid solution.