【摘要】 采用氮气保护方法改进电弧喷涂技术,制备含纳米陶瓷颗粒的粉芯丝材电弧喷涂层,研究其组织结构和高温冲蚀性能.结果表明,氮气保护提高了涂层的致密性和均匀性,组织的连续性和均匀性得到明显改善,涂层中氧化物显著减少.氮气保护使更多的合金元素熔入Fe中形成Fe基固溶体,纳米陶瓷相在基体相中呈较均匀的弥散分布状态.当氮气保护的涂层受磨粒冲蚀时,不会出现明显的层状形式流失.在本试验条件下,3种氮气保护涂层平均体积冲蚀率比无氮气保护均有显著提高.氮气保护改善了纳米陶瓷相与基体相的结合,更有利于发挥纳米陶瓷颗粒对涂层的弥散强化作用.更多还原

【Abstract】 Composite coatings containing nanosized ceramic powders were fabricated through an arc-spraying procedure with nitrogen protective atmosphere, using corresponding cored wires.The microstructure and high temperature erosion property of the coatings were investigated.With the protective atmosphere of nitrogen,the amount of oxides was reduced significantly and a much denser and homogeneous coating was achieved.Relatively more elements dissolved into the iron base to form solid solutions,and the ceramic reinforcements dispersed more homogeneously.Materials loss due to detachment was less remarkable with the coatings arc-sprayed under nitrogen.In the current investigation, the high temperature erosion resistance of three composite coatings fabricated with the protection of nitrogen was significantly improved compared to the corresponding unprotected one.The strengthening effects of the ceramic powders were more significant for the coatings deposited under the nitrogen atmosphere,because of the enhanced attachment between the reinforcements to the matrix.更多还原