等离子喷涂Ag-SnO2涂层的微观结构和性能

Microstructure and properties of Ag-SnO2 coating fabricated by plasma spraying

摘要:

采用等离子喷涂技术在铜基体表面制备了Ag-SnO2涂层，应用XRD和SEM对涂层的相结构和微观组织进行了表征，通过拉伸和硬度实验测定了涂层的力学性能，并采用电弧侵蚀实验测试了涂层的耐电弧侵蚀性能。结果表明，所得涂层结构均匀致密，涂层内纳米级SnO2颗粒均匀分布在银基体中；涂层的力学性能和电弧侵蚀性能与块体合金接近；电弧侵蚀试验后，涂层表面阴极斑点分散，烧蚀轻微，表明所制备的Ag-SnO2涂层具有良好的耐电弧侵蚀特性。

Abstract:

Ag-SnO2 coating on copper substrate has been prepared by atmospheric plasma spraying method using the energy ball milled Ag-12wt.%SnO2 composite powders as the raw materials. The microstructures of Ag-SnO2 coating were characterized using XRD and SEM, respectively. The mechanical properties and arc erosion performance of as sprayed coating have been determined by tensile test, microhardness and arc erosion test, respectively. The results show that Ag-SnO2 coating presented the compact microstructure, and the nanosized SnO2 particles are uniformly dispersed in the Ag matrix of coating. The mechanical properties and arc erosion performance of Ag-SnO2 coating are close to that of bulk alloy. After arcing test, the surface of coating presents the dispersion of cathode spots and a little erosion, indicating that Ag-SnO2 coating has excellent arc-erosion resistance. Plasma spray technique is an effective approach to manufacture Ag-SnO2 contact coating with good mechanical properties and arc erosion resistance performance.