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采用等离子喷涂Al-Fe2O3复合粉的方法制备陶瓷基复合材料涂层。利用X射线衍射仪、扫描电镜和透射电镜观察分析涂层的显微组织,并测定了涂层的结合强度、硬度、韧性和耐磨性能。结果表明,Al-Fe2O3复合粉在等离子喷涂过程中发生铝热反应生成了FeAl2O4、α-Fe和γ-Al2O3相。透射电镜分析表明,所制备的复合涂层呈现纳米结构的显微组织,其中几十到几百纳米的球状α-Fe和γ-Al2O3晶粒均匀地分散在等轴状和柱状的FeAl2O4纳米晶基体上。与传统的单相微米Al2O3涂层相比,复合涂层的结合强度、韧性和耐磨性明显提高,其原因主要是复合涂层为纳米结构并且存在塑性金属相Fe。
Preparation of Ceramic Matrix Composites Coating by Plasma Sprayed Al-Fe2O3 Composite Powder. The microstructure of the coating was analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The bonding strength, hardness, toughness and wear resistance of the coating were measured. The results show that FeAl2O4, α-Fe and γ-Al2O3 phases are formed by the thermite reaction of Al-Fe2O3 composite powders during the plasma spraying process. Transmission electron microscopy analysis showed that the prepared composite coating showed nanostructured microstructure, in which tens to hundreds of nanometers spherical α-Fe and γ-Al2O3 grains uniformly dispersed in the equiaxed and columnar FeAl2O4 nanocrystals Substrate. Compared with the traditional single-phase micro-Al2O3 coating, the bonding strength, toughness and wear resistance of the composite coating are obviously improved because the composite coating is nanostructured and the plastic phase Fe exists.