Effects of CeO2 nanoparticles on microstructure and properties of laser cladded NiCoCrAlY coatings
来源期刊：Journal of Rare Earths2010年第2期
论文作者：王宏宇 左敦稳 黎向锋 陈康敏 黄铭敏
文章页码：246 - 250
摘 要：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.
王宏宇1,2，左敦稳1，黎向锋1，陈康敏3，黄铭敏3
1. College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics2. School of Mechanical Engineering,Jiangsu University3. School of Materials and Engineering,Jiangsu University
摘 要：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.
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