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Chin. Phys. B, 2014, Vol. 23(7): 074205    DOI: 10.1088/1674-1056/23/7/074205
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Application of thermal stress model to paint removal by Q-switched Nd:YAG laser

Zou Wan-Fang (邹万芳), Xie Ying-Mao (谢应茂), Xiao Xing (肖兴), Zeng Xiang-Zhi (曾祥志), Luo Ying (罗颖)
Institute of Optoelectronic Materials and Technology, Department of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China
Abstract  In this paper, we demonstrate that thermal stress is the main mechanism in the process of paint removal by Q-switched Nd:YAG laser (λ =1064 nm, τ=10 ns). A theoretical model of paint removal by short-pulse laser is established from the perspective of thermal stress. Thermal stress is generated by thermal expansion, and the temperatures of different samples are calculated according to the one-dimensional (1D) heat conduction equation. The theoretical cleaning threshold can be obtained by comparing thermal stress with the adhesion of paint, and the theoretical damage threshold is obtained by calculating the temperature. Moreover, the theoretical calculations are verified by experimental results. It is shown that the thermal stress model of the laser cleaning is very useful to choose the appropriate laser fluence in the practical applications of paint removal by Q-switched Nd: YAG laser because our model can validly balance the efficiency of laser cleaning and the safety of the substrate.
Keywords:  laser cleaning      thermal stress      cleaning threshold      damage threshold  
Received:  16 October 2013      Revised:  04 December 2013      Accepted manuscript online: 
PACS:  42.62.-b (Laser applications)  
  81.65.Cf (Surface cleaning, etching, patterning)  
  79.20.Ds (Laser-beam impact phenomena)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61067002), the Foundation for Department of Education of Jiangxi Province, China (Grant No. GJJ12581), the Natural Science Foundation of Jiangxi Province, China (Grant No. 20132BAB212008), and the Foundation for Gannan Normal University, China (Grant No. 11kyz12).
Corresponding Authors:  Zou Wan-Fang     E-mail:  zouwanfang@163.com
About author:  42.62.-b; 81.65.Cf; 79.20.Ds

Cite this article: 

Zou Wan-Fang (邹万芳), Xie Ying-Mao (谢应茂), Xiao Xing (肖兴), Zeng Xiang-Zhi (曾祥志), Luo Ying (罗颖) Application of thermal stress model to paint removal by Q-switched Nd:YAG laser 2014 Chin. Phys. B 23 074205

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