Microstructure of Ni–Al powder and Ni–Al composite coatings prepared by twin-wire arc spraying |
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作者姓名: | Ji-xiao Wang Gui-xian Wang Jing-shun Liu Lun-yong Zhang Wei Wang Ze Li Qi-xiang Wang Jian-fei Sun |
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作者单位: | Harbin Welding Institute, China Academy of Machinery Science & Technology, Harbin, 150028, China |
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基金项目: | This work was financially supported by the International Cooperation Project Foundation in Science and Technology of China;Bing Du, Senior Engineer at the Harbin Welding Institute, China Academy of Machinery Science & Technology and Dr. Zhi-ping Wang at the College of Science, Civil Aviation University of China for their useful suggestions and discus-sion |
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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 NiAl in addition to a small amount of Al2O3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, NiAl, and Ni3Al in addition to a small amount of Al and Al2O3, and NiAl 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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关 键 词: | spraying powder composite coatings aluminum alloys intermetallics microstructure |
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