期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 49, 期 11-12, 页码 1928-1936出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2005.11.005
关键词
dielectric transition; phase explosion; laser ablation; micromachining
Phase explosion is an explosive liquid to vapor phase change that occurs during laser ablation as the surface approaches 90% of the thermodynamic critical temperature (0.9T(c)), which is the upper limit of superheating. Large variations in properties are expected to occur near 0.8T(c), transforming the electrically conductive metal into a nearly transparent dielectric, an effect that has been neglected in previous models of laser ablation. The work presented in this paper numerically investigates the possible effect of the dielectric transition using a one dimensional heat transfer model. The results show that accurate knowledge of the absorption coefficient above 0.8T(c) is critical for predicting the laser fluence at which phase explosion occurs. (c) 2005 Elsevier Ltd. All rights reserved.
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