A model for the interaction of near-infrared laser pulses with metal powders in selective laser sintering |
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| Authors: | P Fischer N Karapatis V Romano R Glardon HP Weber |
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| Institution: | (1) Institute of Applied Physics, Laser Materials Processing, University of Bern, 3012 Bern, Switzerland, CH;(2) Center for Advanced Rapid Tooling, Mechanical Engineering Department, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland, CH |
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| Abstract: | A thermal model of the interaction of pulsed near-infrared laser radiation from a Nd:YAG laser was made, taking the measured
powder properties such as reflectance, optical penetration depth and thermal conductivity into account. It allows an estimation
of the evolution of two different temperatures: the average temperature of the powder (taken over the grains in a volume given
by the laser beam diameter and the optical penetration depth) and the temperature distinction within a single grain. It showed
that in pulsed mode consolidation can be achieved at much lower average power as the surface of the powder particles are molten
but their cores remain at nearly room temperature. This leads to a much lower average temperature and therefore a dramatic
decrease in residual thermal stresses in the finished piece. The results of the model were experimentally tested and confirmed.
Received: 26 July 2001 / Accepted: 23 November 2001 / Published online: 23 January 2002 |
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| Keywords: | PACS: 42 62 C 81 20 E 72 15 E 07 05 T |
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