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用喷雾造粒工艺制备了Fe2O3–Al复合粉体,通过等离子喷涂工艺制备出FeAl2O4基复合材料。对Fe2O3–Al复合粉颗粒在等离子体焰流内的状态变化、反应动力学、反应产物和急冷后材料的组织结构进行研究。结果表明:Fe2O3–Al复合粉颗粒在沉积前的温度为3 274.5℃,速率为179 m/s,主要反应产物为Fe–Al–O陶瓷溶液。复合粉颗粒成分的均匀性和致密度不同,最终的反应产物也不同:含Al高的颗粒,反应产物中含有较高的Al;而含Al低的颗粒,反应产物中含有较高的Fe;并非每一个颗粒的反应产物中都有Fe形成,复合颗粒在反应极不充分时没有Fe形成。反应产物急冷凝固后形成以FeAl2O4固溶体为基的复合材料。
Fe2O3-Al composite powders were prepared by spray granulation process, and FeAl2O4-based composite materials were prepared by plasma spraying. The change of state, reaction kinetics, reaction products and microstructure of Fe2O3-Al composite powder in plasma flame were studied. The results show that the temperature of the Fe2O3-Al composite powder before deposition is 3 274.5 ℃ and the rate is 179 m / s. The main reaction product is Fe-Al-O ceramic solution. The composite powders have different homogeneity and density, and the final reaction products are different: the particles with high content of Al are contained in the reaction product, while the particles with low content of Al are contained in the reaction product with higher content of Fe; Fe is not formed in the reaction product of each of the particles, and the composite particles do not have Fe formed when the reaction is extremely insufficient. The reaction product is rapidly solidified to form a composite material based on FeAl2O4 solid solution.