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和精密天平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Al2O3、Cr2O3、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Al2O3+Cr2O3+Ni(Al,Cr)2O4薄膜, 避免了Al2O3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。
A pseudo-alloy coating PS45/CuAl8 was prepared on Q235 steel by activated combustion high-velocity electirc arc spraying(HVAA). The cycle oxidation experiments at 600oC and 800oC in air for these coatings were accomplished, the microstructure, crystal structure and oxidation resistance properties were haracterized and analyzed by means of X-ray diffraction, scanning electron microscopy (SEM) with energy spectrometer (EDS) and the cycle oxidation behaviors were investigated. The results show that the pseudo-alloy coatings PS45/CuAl8 compose of Al2O3, Cr2 O3, α–Cu and γ–Ni solid solution, and possess dense and typical lamellar structure which were homogeneous. After high temperature oxidation, the coating was covered by dense, continuous and complete oxide films of Cr2O3, Al2O3 and Ni(Cr,Al)2O4, which can avoid spalling of Al2O3 film and reduce the oxidation rate of the composite coating, play an important role for protecting the substrate.
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