On tailoring of laser scan approaches for processing of a functionally graded material

Abstract

ABSTRACT When it comes to machining functionally graded materials like tetragonal zirconia polycrystal-alumina, laser machining has emerged as a prominent technique, surpassing both traditional and non-traditional methods. In spite of its benefits, there are also challenges linked to laser machining of thicker substrates, primarily heat buildup, and loss of energy after many passes. In light of these difficulties, the current research investigates the relative effectiveness of short pulsed laser scan approaches in the processing of tetragonal zirconia polycrystal-alumina. A comparative investigation has been conducted between traditional laser processing and step-down laser processing of thicker tetragonal zirconia polycrystal-alumina, where the time-dependent ablation performance of short pulsed laser processing has been scrutinized with the support of experimental investigations to gain insight into the mechanism of both processes. Experimental results show that step-down laser processing outperforms the traditional laser processing by increasing ablation alongside reducing taperness. Step-down laser processing with scan track modulation effectively reduces the narrowing effect of the Gaussian beam profile by enhancing the machinability of thicker tetragonal zirconia polycrystal-alumina. This indicates its effectiveness in processing thicker substrates; which are substantial for biomedical implants.