Preparation and Characterization of Al₂O₃/ZrO₂-MgO-CeO₂ Composite Coatings Prepared by Flame Spraying

Abstract:

In the present work, ultra-fine Al₂O₃/ZrO₂-MgO-CeO₂ powders were used as the starting materials to produce Al₂O₃-ZrO₂ composite coatings on 45# carbon steel by flame spray. The ultra-fine Al₂O₃/ZrO₂-MgO-CeO₂ powders were prepared via the co-precipitation method accompanied a crushing sintering process. The microstructure, the phase compositions and the bond strength of the crushed sintered powders and the corresponding composite coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and a tensile bond strength tests respectively. It was found that the phase composition, the surface topography and the coating adhesion were different from the difference kinds of coatings. Results indicated that the phase composition of the flame sprayed ceramic coatings consisted of tetragonal-ZrO₂, cubic-ZrO₂, ZTA (zirconia toughened alumina) and γ-Al₂O₃, with a small amount of α-Al₂O₃, and that bond strength values attained 45.1 MPa for 42.6wt.% Al₂O₃/57.4wt.% Mg_0.13Ce_0.1Zr_0.77O_1.87 coating.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 410-415
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.410
• Online since: February 2011
• Authors: Wen Guang Zhao, Xin Zhi, Sheng Li An
• Keywords: Composite Coating, Crushing Sintered, Flame Spraying, Phase Transformation

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