Influence of Exposure Time of Nd: YAG Laser on Mechanical Properties and Particle Size of Zirconium Silicate

Abstract

The surface modification obtained by laser beam irradiation requires a proper relationship among the laser beam parameters, to assure the irradiated surface morphology and physical chemistry properties surface. In this study, the photothermal effect of high power Nd: YAG laser at 1064 nm wavelength for different durations on the surface properties of zirconium silicate (ZrSiO4) ceramics was investigated. Specimens of zirconium silicate (ZrSiO4) ceramic pieces were divided into four samples according to irradiation duration as follows: one control sample (no treatment), and three samples irradiated with Nd: YAG laser at irradiation durations 3, 4 and 5 minutes. The irradiation was applied with fixed output power (60 W) with continuous mode. The samples hardness was measured, then SEM (Scanning Electron Microscope), EDX (Energy Dispersive X_ray), UV-visible spectroscopy and FTIR (Fourier Transform Inrared) characterization was done. The results show that high power Nd: YAG laser provide higher hardness surfaces compared to non-treated surface. SEM images demonstrate the formation of microstructures, smoother surface and solidification process occurring confirming the hardness results. FTIR spectra denotes the presence of quartz with small particle that improves mechanical strength of the zirconium silicate. Furthermore, EDX results reveal that laser irradiation does not change the chemical surface composition of ceramics. A linear correlation between laser irradiation duration and hardness, tensile strength and surface solidification was fond, without causing material defect.Moreover, Increase in transmittance of the irradiated zirconium silicate in the visible and near infrared range was also found using UV-vis spectroscopy.