Optimization of Trepanning Patterns for Holes Ablated Using Nanosecond Pulse Laser in Al2O3 Ceramics Substrate

Abstract

Trepanning pattern is an important factor in laser hole machining, affecting both the hole quality and process efficiency. The influence of laser trepanning patterns on the hole ablating using nanosecond pulse laser in Al2O3 ceramics substrate was studied. Two laser trepanning patterns were evaluated, filled spiral trepanning and multiple rings trepanning, with the optimized laser machining parameters. In conjunction with the studies, the hole saturated taper and the saturated processing time were taken as the primary criteria for evaluation of the hole quality and the machining efficiency, respectively. Finally, the trepanning patterns were optimized aiming for the high hole quality; the process was based on the saturated hole tapers. The hole high qualities and machining efficiencies were obtained based on the saturated processing time, which was proven to have a great significance when using the nanosecond pulse laser to machine Al2O3 ceramics substrate.

Robocasting and Laser Micromachining of Sol-Gel Derived 3D Silica/Gelatin/β-TCP Scaffolds for Bone Tissue Regeneration

“…Hydrogel 3D structures for biomedical applications have been successfully processed via femtosecond laser pulses [ 53 ]. However, although laser-assisted fabrication offers high spatial resolution on surface biomaterial patterning and cell guidance, it suffers from low processing speed and limited scaffold size (usually restricted to the millimeter or micrometer scales) [ 52 , 54 ].…”

Drilling of Al2O3 ceramic using ultrasonic assisted electrochemical discharge machining process

“…Al 2 O 3 can also be machined using laser beam machining; in this method, laser beam is focused on the workpiece surface, and due to highly concentrated heat source, the ceramic is melted or evaporated. 3,5,6 In this case, due to alumina's low heat transfer coefficient, the intense heat may lead to the generation of cracks or even cause failure. 7 Electrochemical discharge machining (ECDM) has been introduced as one of the best methods for machining of hard and non-conductive materials such as glasses and ceramics; this technique, which is a combination of electrical discharge machining and electrochemical machining, was first introduced by Kura Fuji for glass drilling.…”

“…Al 2 O 3 can also be machined using laser beam machining; in this method, laser beam is focused on the workpiece surface, and due to highly concentrated heat source, the ceramic is melted or evaporated. 3,5,6 In this case, due to alumina's low heat transfer coefficient, the intense heat may lead to the generation of cracks or even cause failure. 7…”