Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 16, Pages 4205-4218Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.06.015
Keywords
Finishing; Surfaces; Thermal properties; Al2O3; Laser machining
Categories
Funding
- National Science Foundation [NSF-CMMI 1010494]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1010494] Funding Source: National Science Foundation
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High energy lasers are an emerging industrial tool to fabricate complex shapes on hard and brittle structural ceramics such as alumina. The selection of laser processing parameters and the prediction of material removal rates during the laser machining are the critical issues. This paper was attempted to present the state of the art of laser machining of alumina using an integrated experimental and computational approach. A multistep computational model based on COMSOL (TM) Multiphysics was developed to study the influence of various single-pulse laser energy densities and associated physical phenomena (recoil pressure, Marangoni convection, and surface tension) on the temperature history, fluid velocity, crater size, and surface topography. A pulsed Nd:YAG laser was employed to machine alumina under different processing conditions. The surface topography of laser machined alumina was measured by an optical profilometer and the results were compared with the computationally predicted topographic parameters with reasonably close agreement. (C) 2012 Elsevier Ltd. All rights reserved.
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