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采用自行研制的新型热喷涂Fe3Al/WC复合合金粉芯丝材,成功地用高速电弧喷技术制备出了Fe3Al金属化合物基金属陶瓷复合涂层。对涂层成分、显微组织、涂层相结构和组成进行了分析,结果表明,涂层由以Fe-26Al为主的Fe3Al基体相与约20%的WC、W2C和 a-Al2O3相组成。对比研究了Fe3Al/WC涂层和电站锅炉钢20 g从室温至650 ℃氧化环境条件下不同攻角的高温冲蚀磨损性能,结果表明Fe3Al/WC涂层的高温冲蚀磨损抗力高于20 g钢,650 ℃和30°攻角下的稳态相对冲蚀磨损抗力为20 g钢的3.14倍。温度对Fe3Al/WC涂层的冲蚀行为有较大影响:温度 < 450℃,涂层的冲蚀率变化不大,表现出塑性材料的冲蚀行为;温度 >450 ℃,涂层冲蚀率变化较大,呈现典型的脆性材料冲蚀磨损行为。并对其高温冲蚀磨损机理进行了分析。
Fe3Al metal compound based cermet composite coating was successfully prepared by high speed arc spraying using a new type of thermal spraying Fe3Al / WC composite alloy cored wire which was developed by ourselves. The coating composition, microstructure and coating phase structure and composition were analyzed. The results show that the coating consists of Fe-26Al-based Fe3Al matrix and about 20% WC, W2C and a-Al2O3 phases. The results show that the high temperature erosion wear resistance of Fe3Al / WC coating at different angles of attack (room temperature to 650 ℃) is higher than 20 g The steady-state relative erosion wear resistance of steel, at 650 ° C and 30 ° angle of attack, is 3.14 times that of 20 g steel. The temperature has a great effect on the erosion behavior of the Fe3Al / WC coating. When the temperature is lower than 450 ℃, the erosion rate of the coating does not change much, showing the erosion behavior of the plastic material. The temperature> 450 ℃, the coating erosion rate Changes a lot, showing a typical brittle material erosion wear behavior. The mechanism of high temperature erosion wear was analyzed.