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In Situ formation of Titanium Carbide using Titanium and Carbon-nanotube powders by laser cladding



In Situ formation of Titanium Carbide using Titanium and Carbon-nanotube powders by laser cladding



Applied Surface Science 258(7): 0-3177



Titanium metal matrix composite coatings are considered to be important candidates for high wear resistance applications. In this study, TiC reinforced Ti matrix composite layers were fabricated by laser cladding with 5, 1, 15 and 2 wt.% carbon-nanotube. The effects of the carbon-nanotube content on phase composition, microstructure, micro-hardness and dry sliding wear resistance of the coating were studied. Microstructural observation using scanning electron microscopy showed that the coatings consisted of a matrix of alpha-titanium phases and the reinforcement phase of titanium carbide in the form of fine dendrites, indicating that titanium carbide was synthesized by the in situ reaction during laser irradiation. Additionally, measurements on the micro-hardness and dry sliding wear resistance of the coatings indicated that the mechanical properties were affected by the amount of carbon-nanotube in the starting precursor materials and were enhanced by increasing the carbon-nanotube content. indicated that the composite layers exhibit high hardness and excellent wear resistance.By pre-deposition of pure titanium powder and carbon nanotubeson titanium substrate, Ti/TiC cerment coatings were synthesized after laser cladding. The coatings consisted of a matrix of alpha-titanium phases and the reinforcement phase of titanium carbide in the form of fine dendrites. When the weight percentof CNTs was 2%, the micro-hardness of cladding layer was up to 6 times more than that of Ti substrate. The wear resistance of the TiC strengthening coating isapproximately 3 times higher than that of the substrate for 2wt% CNTs under room temperature..

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Accession: 036265986

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DOI: 10.1016/j.apsusc.2011.11.058


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