Characterization of hole circularity and heat affected zone in pulsed CO2 laser drilling of alumina ceramics

Evaluation of thermal residual stresses in laser drilled alumina ceramics using Micro-Raman spectroscopy and COMSOL Multiphysics

“…9, 5, and 6 were considered for the evaluation of residual thermal stresses by Micro-Raman spectroscopy and COMSOL modelling. Table 1 Laser drilling experiments as per L 9 , responses, Grey Relational Grades (GRG) and Grey order, Bharatish et al [27].…”

A theoretical analysis and experimental verification of a laser drilling process for a ceramic substrate

“…Samant et al [6] investigated laser machining of ceramic materials and demonstrated that lasers are highly efficient in processing ceramic materials and do not entail tool wear and workpiece clamping difficulties. Bharatish et al [7] used the Taguchi method and gray relational analysis to determine the optimal CO 2 nanosecond laser drilling parameters for alumina ceramic materials and identified frequency, power, scanning speed, and diameter as the influencing parameters. Studies have shown that pulse frequency has the strongest effect on the taper and diameter of drill holes.…”

Ultrasonic vibration-assisted continuous wave laser surface drilling of materials

“…Laser drilling is one of the most commonly used micromachining processes for creating high quality and high aspect-ratio holes in a range of materials including high performance alloys, ceramics, and composites [1,2]. The laser drilling process offers several advantages such as non-contact processing, excellent reproducibility, and high production rates (up to 100 holes/s).…”