Abstract：A sort of alumina/metal coating characterized by a bi-layered structure of Fe2O3+Cr2O3+Al plus NiO+Al layers, was successfully prepared on steel substrate by melting-casting technique. The microstructure, bonding status of the interface between the coating and the substrate, and the element distribution of the coating were studied. Results indicate that the coating is composed of α-Al2O3, Fe-Ni, Cr, AlNi3 and Fe-Cr. There is an excellent bonding between the coating and the substrate, and no hole or gap is found in the composite. Moreover, there is obvious element diffusion in the interface. The coating is composed of equiaxed grain, columnar grain, dendrites and lath phase. The elements present a uniform distribution in the interface but an obvious segregation in the middle of the coating. The segregation degree of metal elements is strengthened when extending the holding time.
[1] Toma D, Brandl W, Marginean G. Wear and corrosion behaviour of thermally sprayed cermet coatings [J]. Surface and Coatings Technology, 2001, 138(2): 149-158.[2] Bergmann C P, Vicenzi J. Protection against erosive wear using thermal sprayed cermet: a review [M]. Springer Berlin Heidelberg, 2011.[3] Zhang J, Wang Z, Lin P, et al. Effect of Sealing Treatment on Corrosion Resistance of Plasma-Sprayed NiCrAl/Cr2O3-8 wt.% TiO2 Coating [J]. Journal of thermal spray technology, 2011, 20(3): 508-513.[4] Cliche G, Dallaire S. Synthesis and deposition of TiC-Fe coatings by plasma spraying [J]. Surface and Coatings Technology, 1991, 46(2): 199-206.[5] Sidhu T S, Prakash S, Agrawal R D. Studies of the metallurgical and mechanical properties of high velocity oxy-fuel sprayed stellite-6 coatings on Ni-and Fe-based superalloys [J]. Surface and Coatings Technology, 2006, 201(1): 273-281.[6] Saha G C, Khan T I, Zhang G A. Erosion–corrosion resistance of microcrystalline and near-nanocrystalline WC–17Co high velocity oxy-fuel thermal spray coatings [J]. Corrosion Science, 2011, 53(6): 2106-2114.[7] Li J, Yu Z, Wang H, et al. Microstructural characterization of titanium matrix composite coatings reinforced by in situ synthesized TiB+TiC fabricated on Ti6Al4V by laser cladding[J]. Rare Metals, 2010, 29(5): 465-472.[8] Guozhi X, Xiaolong S, Dongjie Z, et al. Microstructure and corrosion properties of thick WC composite coating formed by plasma cladding [J]. Applied Surface Science, 2010, 256(21): 6354-6358.[9] Roos E, Naga S M, Richter R N, et al. Electron beam physical vapour deposition and mechanical properties of c-ZrO2-ZTA-coatings on alloy 617 substrates [J]. Ceramics International, 2012, 38(4): 3317-3326.[10] Li J S, Zhang C R, Li B, et al. Boron nitride coatings by chemical vapor deposition from borazine [J]. Surface and Coatings Technology, 2011, 205(12): 3736-3741.[11] Varma A, Mukasyan A S. Combustion synthesis of advanced materials: Fundamentals and applications [J]. Korean Journal of Chemical Engineering, 2004, 21(2): 527-536.[12] Mukasyan A S, White J D E. Combustion joining of refractory materials [J]. International Journal of Self-Propagating High-Temperature Synthesis, 2007, 16(3): 154-168.[13] Morsi K. The diversity of combustion synthesis processing: a review [J]. Journal of Materials Science, 2012, 47(1): 68-92.[14] La P, Bai M, Xue Q, et al. A study of Ni3Al coating on carbon steel surface via the SHS casting route [J]. Surface and Coatings Technology, 1999, 113(1): 44-51.[15] 李吉春, 王泽华, 周泽华, 等. Al-Fe2O3-Cr2O3 体系 SHS 制备 Al2O3 陶瓷复合涂层的研究[J]. 粉末冶金工业, 2012, 21(6): 34-38.[16] Wang C H, Wang Z H, Zhou Z H, et al. Fabrication and characterization of Al2O3-metal composite coating on steel plate with nonpressure combustion synthesis[J]. Rare Metals, 2013, 32(4): 390-396.[17] 王双喜, 王建江. 氧化铝陶瓷内衬不锈钢复合钢管的组织与性能[J]. 硅酸盐学报, 1998, 26(6): 808-812.[18] 张金咏, 傅正义, 王为民, 等. 自蔓延高温合成 (SHS) 过程的热动力学研究[J]. 复合材料学报, 2005, 22(2): 71-77.
2015, Vol. 25 
