【摘要】 开发含纳米组分的粉芯丝材,采用超音速电弧喷涂技术获得复合涂层,对涂层进行退火处理,结合金相、硬度、X射线衍射、扫描电镜、透射电镜等分析方法对喷涂层的组织结构和高温冲蚀性能进行表征。结果表明:喷涂过程中粉芯丝材的表皮材料和芯粉材料能相互熔解和融合形成较均匀的固溶体;涂层中硬度分布较均匀;退火处理使涂层缺陷减少,应力消除,亚稳相分解,同时结晶度提高,从而显著提高涂层硬度;退火处理后涂层耐高温冲蚀性显著提高。更多还原

【Abstract】 A composite coating containing nanosized ceramic powders was fabricated by a supersonic arc-spraying procedure using corresponding cored wires.The microstructure and high temperature erosion property of the coating were studied by characterizations with optical microscope,microhardness,X-ray diffraction,scanning electron microscopy and transmission electron microscopy,with special attentions paid to the effect of the subsequent annealing treatment.The results show that the skin and the cored powders melted and fused to form homogeneous solid solutions during the arc-spraying procedure using the cored wires.The achieved coating shows homogeneous hardness.The subsequent annealing of the coating reduced defects and residual stress,decomposed the metastable phases and at the same time improved the crystallinity of corresponding phases in the coating,which in turn improved its hardness.The high-temperature erosion resistance of the coatings after the subsequent annealing improved significantly.更多还原