Microstructure of Ni–Al powder and Ni–Al composite coatings prepared by twin-wire arc spraying
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第7期
论文作者：Ji-xiao Wang Gui-xian Wang Jing-shun Liu Lun-yong Zhang Wei Wang Ze Li Qi-xiang Wang Jian-fei Sun
文章页码：810 - 818
摘 要：Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying（TWAS）. The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy（SEM） and energy dispersive spectroscopy（EDS）. The results showed that the obtained particle size ranged from 5 to 50 μm. The morphology of the Ni–Al powder showed that molten particles were composed of Ni solid solution, NiAl, Ni3Al, Al2O3, and NiO. The Ni–Al phase and a small amount of Al2O3 particles changed the composition of the coating. The microstructures of the twin-wire-arc-sprayed Ni–Al composite coatings were characterized by SEM, EDS, X-ray diffraction（XRD）, and transmission electron microscopy（TEM）. The results showed that the main phase of the Ni-5wt%Al coating consisted of Ni solid solution and Ni Al in addition to a small amount of Al2O3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, Ni Al, and Ni3Al in addition to a small amount of Al and Al2O3, and Ni Al and Ni3Al intermetallic compounds effectively further improved the final wear property of the coatings. TEM analysis indicated that fine spherical NiAl3 precipitates and a Ni–Al–O amorphous phase formed in the matrix of the Ni solid solution in the original state.
Ji-xiao Wang1,2，Gui-xian Wang3，Jing-shun Liu4，Lun-yong Zhang5，Wei Wang1，Ze Li4，Qi-xiang Wang4，Jian-fei Sun2
1. Harbin Welding Institute, China Academy of Machinery Science & Technology2. School of Materials Science and Engineering, Harbin Institute of Technology3. Shanxi Pingyang Industry Machinery Co., Ltd.4. School of Materials Science and Engineering, Inner Mongolia University of Technology5. Max Plank Center of Complex Phase Materials, Pohang University of Science and Technology
摘 要：Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying（TWAS）. The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy（SEM） and energy dispersive spectroscopy（EDS）. The results showed that the obtained particle size ranged from 5 to 50 μm. The morphology of the Ni–Al powder showed that molten particles were composed of Ni solid solution, NiAl, Ni3Al, Al2O3, and NiO. The Ni–Al phase and a small amount of Al2O3 particles changed the composition of the coating. The microstructures of the twin-wire-arc-sprayed Ni–Al composite coatings were characterized by SEM, EDS, X-ray diffraction（XRD）, and transmission electron microscopy（TEM）. The results showed that the main phase of the Ni-5wt%Al coating consisted of Ni solid solution and Ni Al in addition to a small amount of Al2O3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, Ni Al, and Ni3Al in addition to a small amount of Al and Al2O3, and Ni Al and Ni3Al intermetallic compounds effectively further improved the final wear property of the coatings. TEM analysis indicated that fine spherical NiAl3 precipitates and a Ni–Al–O amorphous phase formed in the matrix of the Ni solid solution in the original state.
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