高速电弧喷涂铁基Cr_3C_2复合涂层的显微组织

Microstructure of High Velocity Arc Sprayed Fe-based/Cr_3C_2 Composite Coatings

采用高速电弧喷涂技术将自制的铁基Cr3C2粉芯丝材在20钢上制备复合涂层,采用SEM、TEM、XRD等研究了涂层的显微组织和物相结构。结果表明:涂层与基体结合紧密,具有致密的层状结构,颗粒扁平细小,孔隙率低,具有较高的显微硬度;在涂层中存在着多种结构复杂的组织和化合物相,其中-αFe为基体相,主要硬质相为(Fe,Cr)23C6、(Fe,Cr)7C3,另外还有FeCr2O4、Cr2O3等氧化物相,其中某些物相之间存在着平行的晶体学取向关系。

Fe-based/Cr3C2 composite coatings were prepared using core wires and high velocity arc spraying （HVAS）technology. Their microstructure and phase compositions were investigated by SEM, TEM and XRD. The results showed that the coatings were well bonded to the substrate, and showed dense lamellar structure, fine grains, low porosity and high hardness. In the coatings there existed complex compounds, including base phases like α-Fe, main reinforcement phases like （Fe, Cr） 23C6 and （Fe, Cr）7C3, and oxidation phases like FeCr2O4 and Cr2O3. Some of the phases had parallel crystal relationship.