MICROSTRUCTURE AND MORPHOLOGY OF PHASES IN LASER REMELTING CERAMIC COATINGS
WU Qiuhong;TAO Zengyi;CUI Kun(Huazhong University of Science and Technology;Wuhan 430074);HE Lianlong;LI Douxing;YE Hengqiang(Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015)(Manuscript received 1994-07-28;in revised form 1995-03-01)
Cite this article:
WU Qiuhong;TAO Zengyi;CUI Kun(Huazhong University of Science and Technology;Wuhan 430074);HE Lianlong;LI Douxing;YE Hengqiang(Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015)(Manuscript received 1994-07-28;in revised form 1995-03-01). MICROSTRUCTURE AND MORPHOLOGY OF PHASES IN LASER REMELTING CERAMIC COATINGS. Acta Metall Sin, 1995, 31(11): 508-512.
Abstract Microstructure,morphology and composition of the phases in 2 kW laser remelted Al_2O_3-13wt-%TiO_2 ceramic coatings on ICr18Ni9Ti substrate were examined by using electron diffraction, diffraction contrast image and EDAX. Results showed that TiO_2 and a part of Al_2O_3 formed Al_2TiO_5 and a superlattice phase appeared in the ceramic layer;a little alloy element of substrate permeated into α-Al_2O_3 and replaced only a part of Ti in Al_2TiO_5.The distribution and morphology of α-Al_2O_3 and Al_2TiO_5 were related with the distance from surface.The shape of Al_2TiO_5 was strip near surface and block near substrate,and the farther from surface,and the more Al_2TiO_5 in the coatings.
