Publication

Abstract : Ceramic coatings enhance the durability of steel pipes used in industries, including mining, by reducing erosion. In this study, ceramic layers of Al2O3 and TiC were deposited on the inner surface of the steel pipes using a centrifugal self-propagating high-temperature synthesis process. The microhardness and erosion resistance of coated samples were enhanced through annealing. The Al2O3-coated sample was annealed at 650 °C for 4 to 6 h, and the TiC-coated sample was annealed at 750 °C for 3 to 5 h. Microhardness analysis showed that the Al2O3-coated sample annealed at 650 °C for 5 h achieved a hardness of 1078 HV, which is 1.2 and 4.2 times higher than that of the coated and uncoated samples, respectively. Similarly, the TiC-coated sample exhibited a superior hardness of 1455 HV at 4 h of annealing, indicating 1.27 and 5.77 times improvement compared to the coated and uncoated samples, respectively. Slurry erosion tests revealed that the annealed TiC-coated sample offered the best resistance compared with other samples under all test conditions. The impact velocity (10 to 40 m/s) of the jet highly influences the erosion rate, followed by the impingement angle (30 to 90º) and slurry concentration (10 to 40 wt%). The annealed TiC-coated sample exhibits high hardness and erosion resistance among the other samples, which demonstrates that annealing effectively enhances the properties of ceramic-coated steel.