| Popis: |
As is known to all, the technology is an effective way to improve the material surface performance. In this paper, Micro-arc spark deposition with stellite 6 alloy as the coating material on SCH13 steel substrates was carried out using high-energy micro-arc process. The microstructure, chemical composition, phase identification and hardness of the deposition layers were examined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Micro-hardness tester, respectively. Moreover, through high temperature oxidation, the property for the deposition layers of resistance to high temperature oxidation was analyzed systematically. The results show that the coatings were consisted of γ-Co solid solution and chromium carbides. The epitaxial growth coating with columnar grains was achieved by micro-arc spark deposition and the coating of stellite 6 alloy has a good metallurgical combination with the SCH13 steel substrate. After high temperature oxidation at 900°C, the surface film of the deposition layers were mainly consisted of chromium oxides, and the surface oxide film of SCH13 steel was Fe2O3and NiCr2O4, the property for the deposition layers of resistance to high temperature oxidation is obviously better than SCH13 steel substrate. |
