Microstructure and infrared emissivity property of coating containing TiO2 formed on titanium alloy by microarc oxidation |
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| Authors: | ZW Wang YM Wang Y Liu JL Xu LX Guo Y Zhou JH Ouyang JM Dai |
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| Institution: | aInstitute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;bKey Laboratory of Bionic Engineering of Ministry of Education, Jilin University, Changchun 130025, China;cShanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China |
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| Abstract: | Ceramic coatings containing TiO2 were formed on Ti6Al2Zr1Mo1V alloy surface by microarc oxidation (MAO) method. The microstructure, phase and chemical composition of the coatings were analyzed by SEM, XRD and EDS techniques. The coating mainly consists of rutile TiO2 and a small amount of anatase TiO2. The infrared emissivity values of coated and uncoated titanium samples when exposed to 700 °C were tested. It was found that the coating exhibits a higher infrared emissivity value (about 0.9) in the wavelength range of 8–14 μm than that of the uncoated titanium alloy, although which shows a slight increase from 0.1 to 0.3 with increasing exposure time at 700 °C. The relatively high infrared emissivity value of the MAO coating is possibly attributed to the photon emission from the as formed TiO2 phase. |
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| Keywords: | Titanium alloy Coating Microstructure Infrared emissivity |
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