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以Fe2O3、WO3、Al和C为反应原料,采用SHS-离心法制备W-C-Fe内衬复合钢管.利用X射线衍射分析内衬层的相组成,扫描电镜观察金属陶瓷涂层的组织,利用能谱仪分析涂层与基体结合处的元素分布,显微硬度仪测量内衬层硬度.结果表明:涂层与基体之间形成良好的冶金结合,涂层主要由Fe3W3C组成,还有少量的WC、W2C、Fe3C和Fe;涂层组织呈梯度分布,靠近基体处晶粒细小,远离基体处晶粒呈粗大树枝状;涂层显微硬度为13.5±1.6 GPa,是基体的7~8倍.
WC-Fe-lined composite steel tube was prepared by SHS-centrifugal method using Fe2O3, WO3, Al and C. The phase composition of the inner liner was analyzed by X-ray diffraction and the microstructure of the cermet coating was observed by scanning electron microscopy. The elemental distribution of the bond between the coating and the substrate was analyzed by spectrometer and the hardness of the liner was measured by microhardness tester.The results showed that the coating formed a good metallurgical bond with the substrate, the coating mainly consisted of Fe3W3C, and a small amount of WC , W2C, Fe3C and Fe. The microstructure of the coating was graded, the grains near the matrix were fine and the grains far away from the matrix were coarse dendrites. The microhardness of the coating was 13.5 ± 1.6 GPa, which was 7 ~ 8 times of the matrix.