Modeling of Boundary Porosity Formation in Laser Melting and Re-Solidification of Ceramics
Laser melting and re-solidification has been used to densify and homogenize ceramic surfaces, leading to increased high-temperature corrosion and erosion resistance. Although complete sealing of pores can be achieved on the surface, pores have been observed in the boundary between the laser-treated zone and the untreated bulk. This paper investigates the mechanisms of pore formation and the various factors affecting it. A simple analytical model that predicts the maximum final pore diameter and location along the treated zone/untreated bulk boundary is derived, in terms of the materials properties and the processing parameters. Experimental investigations for a range of processing speeds and power densities have verified the model predictions, identifying the effects of processing speed and laser power density on the maximum pore diameter.
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Document Type: Research Article
Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, UK
Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester, UK
Publication date: 2006-04-01