Synthesis of TiN thin films by a new combined laser/sol-gel processing technique |
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Authors: | Tamer Ezz Philip Crouse Zhu Liu |
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Institution: | a Laser Processing Research Centre, School of Mechanical, Aerospace, and Civil Engineering, University of Manchester, Sackville Street, Manchester M60 1QD, United Kingdom b Corrosion and Protection Centre, School of Materials Science, University of Manchester, The Mill, Manchester M60 1QD, United Kingdom |
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Abstract: | In this work a novel method for synthesising TiN coatings is reported. A high-power diode laser at different powers and traverse speeds was applied to a mild steel substrate, coated with a slurry of titania sol-gel, urea and graphite. The reaction chemical thermodynamics was investigated to estimate the compositions, temperature range, and the required reaction enthalpy for producing TiN. A one-dimensional heat transfer model was used to optimise the processing parameters. Surface morphology and microstructure of the deposited coatings and substrate surface layers were examined using optical microscopy, scanning electron microscope, and field emission gun scanning electron microscope which reveals deposition of very thin layer about 0.3 μm of pure TiN and the presence of sub-micron crystalline structure of TiN forming a metal matrix composite inter-layer with the substrate below the film which suggest a good metallurgically bonding with the substrate. Chemical composition was determined by energy dispersive X-ray analysis. The phases were identified by X-ray diffraction which confirms the synthesis of TiN film for all the samples. Results of nano-hardness measurements revealed a hardness value of the order of 22-27 GPa. |
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Keywords: | Laser processing Sol-gel Titanium nitride |
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