Influence of TiO2 and ZrO2 Nano Particles Addition in Al2O3 Base Coating Using Plasma Spraying
The additive (3wt%) nano-particles of anatase-TiO2 and monoclinic-ZrO2 were prepared using ball-milling method to form Al2O3/3wt%TiO2 and Al2O3/3wt%ZrO2 nanocomposite powders. The incorporation of nano-particles can significantly enhance the microstructure and mechanic properties of Al2O3-base coating. The phase of microstructure coating was present mostly of γ-Al2O3 and α-Al2O3 phases, while anatase-TiO2 was transformed to rutile-TiO2 and monoclinic-ZrO2 was changed to tetragonal-ZrO2 due to such high temperature of plasma plume. SEM microstructures of the coatings mainly displayed a lamellar structure of Al2O3 with interlarmellar pores and well dispersed splats of TiO2 and ZrO2 phases. The Al2O3/3wt%ZrO2 presented the lowest value of friction coefficient and sliding wear rate. It was found that the plasma-sprayed composite coating possessed better wear resistance than that of monolithic Al2O3 coating. The addition of nano-particles was found to improve friction coefficient and sliding wear resistance.
N. Dejang and S. Jiansirisomboon, "Influence of TiO2 and ZrO2 Nano Particles Addition in Al2O3 Base Coating Using Plasma Spraying", Applied Mechanics and Materials, Vols. 110-116, pp. 1849-1854, 2012