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CeO2 nanoparticles(nano-CeO2p) were added into laser cladded NiCoCrAlY coatings on Ni-based superalloy substrate to improve the microstructure and properties.Scanning electron microscope(SEM),X-ray diffractometer(XRD),micro-hardness tester,and heat treatment furnace were employed to investigate their morphologies,phases,micro-hardness and thermal shock resistance,compared with the coating without nanoparticles added.The results showed that the microstructure and properties of the coatings with the addition of nano-CeO2p were better than the coating without nanoparticles added,in which the coating with the addition of 2.0 wt.% nano-CeO2p showed the most significant improvement effects.With the addition of nano-CeO2p,the growth pattern of interface grain was changed,the microstructure of cladding layer was refined,and the solid solubility of Cr was increased.These changes of microstructure after adding nano-CeO2p improved micro-hardness and its distribution uniformity on the cross section,and the thermal shock resistance as well.
CeO2 nanoparticles (nano-CeO2p) were added into laser cladded NiCoCrAlY coatings on Ni-based superalloy substrates to improve the microstructure and properties. Scanning electron microscope (SEM), X-ray diffractometer furnace were employed to investigate their morphologies, phases, micro-hardness and thermal shock resistance, compared with the coating without nanoparticles added. results showed that the microstructure and properties of the coatings with the addition of nano-CeO2p were better than the coating without nanoparticles added, in which the coating with the addition of 2.0 wt.% nano-CeO2p showed the most significant improvement effects .With the addition of nano-CeO2p, the growth pattern of interface grain was changed, the microstructure of cladding layer was refined, and the solid solubility of Cr was increased. These changes of microstructure after adding nano-CeO2p improved micro-hardness and its distribution uniformity on the cross sectio n, and the thermal shock resistance as well.