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Temperature-dependent absorptivity evolution of gray epoxy painted iron under CW laser irradiation
Author(s): T. T. Wu; H. Yan; C. H. Wei; Y. X. Zhu; M. Y. Song; L. X. Wu; Y. W. Lv; L. J. Wang
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Paper Abstract

The energy deposition efficiency of high energy laser irradiation on painted metal was studied. Experiments of uniform 1 070 nm continuous wave (CW) laser beams irradiating an entire 10 mm quadrate surface of gray epoxy painted iron were performed to investigate the laser-heating-induced changes of the surface absorption behavior. Laser power densities were set as 54-233 W/cm2 and temperature rising processes of the painted iron specimens were monitored. By means of heat transfer inversion calculation, the absorptivity data during laser irradiation were obtained, of which the good accuracy was further proven by optical measurements. It is found that the absorptivity showed strong temperature-dependence properties in spite of the different laser power densities. During temperature increasing from 20 to 1 300°C, the temperature-dependent absorptivity experienced four stages, i.e. slowly decline, rapidly decline, slowly increase, and rapidly increase.The visualized color of gray coating layer changing to white at 510°C and physical broken at 1 050°C were the main reasons for absorptivity rapid changes.

Paper Details

Date Published: 29 March 2019
PDF: 8 pages
Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 1104626 (29 March 2019); doi: 10.1117/12.2524464
Show Author Affiliations
T. T. Wu, Northwest Institute of Nuclear Technology (China)
H. Yan, Northwest Institute of Nuclear Technology (China)
C. H. Wei, Northwest Institute of Nuclear Technology (China)
Y. X. Zhu, Northwest Institute of Nuclear Technology (China)
M. Y. Song, Northwest Institute of Nuclear Technology (China)
L. X. Wu, Northwest Institute of Nuclear Technology (China)
Y. W. Lv, Northwest Institute of Nuclear Technology (China)
L. J. Wang, Northwest Institute of Nuclear Technology (China)


Published in SPIE Proceedings Vol. 11046:
Fifth International Symposium on Laser Interaction with Matter
YiJun Zhao, Editor(s)

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