The study of NiAl-TiB2 coatings prepared by electro-thermal explosion ultrahigh speed spraying technology |
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Authors: | Shi-xiang Hou Zong-de LiuDong-yu Liu |
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Affiliation: | Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, 102206, China |
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Abstract: | NiAl-TiB2 composite coatings with 0, 10 and 20 wt.% TiB2 were synthesized on the Ni-based superalloy substrate using electro-thermal explosion ultrahigh speed spraying technology. The microstructure analysis shows that the coatings consist of submicron grains. The bond between coatings and substrate is metallic cohesion. TiB2 as a powerful reinforcement is doped in NiAl for increasing its hardness. The isothermal oxidation test is carried out for the composite coatings at 1100 °C in air. The result shows that the oxidation resistance of NiAl coating is higher than that of NiAl-10TiB2 and NiAl-20TiB2 coatings. The phases of oxides on the coatings during the process at high temperature have been analyzed by X-ray diffraction. The results show that Al2O3 and Cr2O3 coexistence on surface of NiAl coating, while Al2O3, Cr2O3, TiO2 and a small amount of NiO form on surface of NiAl-10TiB2 and NiAl-20TiB2 coatings after oxidation for 4 h. |
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Keywords: | Electro-thermal explosion ultrahigh speed spraying NiAl-TiB2 coatings Microstructure Oxidation resistance |
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