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采用超音速活性电弧喷涂技术在Q235钢基体表面制备PS45/CuAl8伪合金复合涂层,将该涂层在600℃和800℃进行循环氧化,采用XRD、SEM和精密天不等手段对涂层的显微结构进行表征,研究了涂层的循环氧化性能。结果表明:PS45/CuAl8伪合金复合涂层主要由Al_2O_3、Cr_2O_3、α-Cu和γ-Ni固溶体组成,组织致密,颗粒成扁平状且扁平化程度高、分布均匀。经高温循环氧化后在涂层表面形成了一层致密的Al_2O_3+Cr_2O_3+Ni(Al,Cr)_2O_4薄膜,避免了Al_2O_3薄膜的剥落,从而降低了涂层氧化速率,提高了基体的抗高温循环氧化性能。
The PS45 / CuAl8 pseudo-alloy composite coating was prepared on the surface of Q235 steel substrate by supersonic reactive arc spraying. The coating was reoxidized at 600 ℃ and 800 ℃. The coatings were coated by XRD, SEM and precision weathering The microstructure was characterized and the cyclic oxidation behavior of the coating was studied. The results show that the composite coating of PS45 / CuAl8 pseudo-alloy is mainly composed of Al 2 O 3, Cr 2 O 3, α-Cu and γ-Ni solid solution. The microstructure is dense, the particles are flat and the flatness is high and the distribution is even. A dense Al 2 O 3 + Cr 2 O 3 + Ni (Al, Cr) 2 O 4 thin film was formed on the surface of the coating by high temperature cyclic oxidation, which avoided the flaking of the Al 2 O 3 thin film, reduced the oxidation rate of the coating and improved the high temperature resistant cycle Oxidation performance.