【摘要】 利用机械团聚法制备了适合等离子喷涂的Fe2O3Al复合粉体,将此粉体送入等离子焰流,通过复合粉的自反应制备含有Fe、Al2O3和FeAl2O4的复合陶瓷涂层。利用扫描电镜(SEM)、X射线衍射仪(XRD)和透射电镜(TEM)等检测手段对反应等离子制备的复合涂层进行了研究。结果表明:涂层具有以层状陶瓷为骨架,球形金属为弥散相的组织,反应生成涂层的过程是分步进行的,由于反应生成的部分纳米颗粒以及金属的存在,使得涂层的耐磨性和韧性比普通Al2O3涂层有了较大的提高,尤其在高载荷作用下,复合涂层的耐磨性比普通Al2O3提高近两倍。更多还原

【Abstract】 The composite powders were fabricated by means of mechanical agglomeration. The composite coating comprised of FeAl₂O₄、Al₂O₃ and Fe was obtained by feeding the powders input plasma flame. The coatings were examined by SEM, XRD and TEM.The results show that structure of the coating is composed of the skeleton of lamellar ceramic crystallines and dispersion spherical metal phase.The reaction proceeds by steps.The composite coating exhibits high wear resistance and ductility for the presence of metal phase and nanosized particles,and the wear resistance of the in situ coating is higher about two times than that of the conventional alumina coating under high loading condition.更多还原