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设计了FeCrAl、FeCrB两种Fe基粉芯丝材,采用XRD、OM、SEM、TEM、激光脉冲热常数测试仪、磨粒磨损试验机等对高速电弧喷涂层的微观组织结构、热导率、耐磨性进行表征,并与工程中常用的3Cr13喷涂层进行对比研究。结果表明,制备的喷涂层较致密,孔隙率低于3.3%。丝材中加入Al、B元素可有效减少涂层中氧化物的生成,而B元素具有更强的除氧效果。氧化物含量低的涂层具有较高的热导率,其中氧化物含量最低的FeCrB涂层室温热导率达8.99 W·m-1·K-1。所设计的FeCrB涂层的显微硬度达到828.3 HV0.1,相对耐磨性为3Cr13涂层的3.7倍。
FeCrAl and FeCrB two kinds of Fe-based core wire materials were designed. The microstructures, thermal conductivities and mechanical properties of high speed arc sprayed coatings were characterized by XRD, OM, SEM, TEM, laser pulse thermal constant tester, The wear resistance was characterized and compared with the commonly used 3Cr13 spray coating in engineering. The results show that the prepared spray coating is more dense and the porosity is less than 3.3%. Wire elements added Al, B element can effectively reduce the formation of oxides in the coating, while the B element has a stronger oxygen scavenging effect. The coatings with low oxide content have higher thermal conductivity. The FeCrB coating with the lowest oxide content has a room temperature thermal conductivity of 8.99 W · m-1 · K-1. The designed FeCrB coating has a microhardness of 828.3 HV0.1 and a relative wear resistance of 3.7 times the 3Cr13 coating.