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Modeling of Boundary Porosity Formation in Laser Melting and Re‐Solidification of Ceramics
Author(s) -
Triantafyllidis Dimitrios,
Li Lin,
Stott Howard
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.00909.x
Subject(s) - materials science , porosity , ceramic , composite material , laser , selective laser melting , grain boundary , boundary (topology) , metallurgy , mineralogy , microstructure , optics , geology , mathematical analysis , physics , mathematics
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.