Laser-Energy-Density Dependent Formation of Al₂O₃-TiC Coating by Laser-Assisted Combustion

Abstract:

Al₂O₃-TiC composite ceramic coatings were obtained by laser-assisted combustion. Al-TiO₂-C precursor powder mixture was coated on a medium-carbon steel substrate. When a laser scanned on the powder mixture, it went through combustion synthesis reaction triggered by the incident laser beam and formed the target products. The microstructure of the obtained coatings with different laser processing parameters was characterized using field emission scanning electron microscopy. The laser energy density, controlled by changing laser power and laser scanning speed, was found to play an important role on the microstructure of the products. The formation mechanism of different micro-morphologies with different laser energy densities was proposed according to thermodynamic calculation.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 2182-2189
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.2182
• Online since: June 2014
• Authors: Cai Xuan Lu, He Ping Li*, Peng Chen, You Wei Yan
• Keywords: Alumina, Ceramic Composite Coating, Combustion Synthesis, Laser, Titanium Carbide

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