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METAL PROCESSING
ArticleName Analysis of laser-chemical cleaning of metal surfaces
DOI 10.17580/nfm.2015.01.07
ArticleAuthor Kaplunov I. A., Rogalin V. E., Filin S. A.
ArticleAuthorData

Tver State University, Tver, Russia:

I. A. Kaplunov, Professor, e-mail: Ivan.Kaplunov@tversu.ru

 

“National center of lser systems and complexes” JSC, Moscow, Russia:
V. E. Rogalin, Head of a sector

 

Plekhanov National Academy of Economics, Moscow, Russia:
S. A. Filin, Assistant Professor

Abstract

Cleaning and preparation of metal surfaces is one of the main stages of technological process. These operations ensure high resource of final products for many areas of science, technology and industry. Problems due to surface contamination often arise in operation of high-power infrared gas lasers which have 100 percent resonator mirrors made of copper having higher reflectivity in the infrared range. For example, reflectivity of clean copper mirror surface at a wave length l = 10.6 μm can reach R = 0.990.002 [1]. Being operated, the copper mirror degrades under exposure and due to chemical contact with laser medium. As a consequence, the reflectivity can lower down to 0.96, which means the radiation leaks increase from 0.01 to 0.04 (4 times). No-touch surface cleaning methods enable partial recovery of reflectivity, and additional effect of laser cleaning improves mirror quality as compared with the fresh-polished mirrors (R = 0.985). This method can be applied to cleaning of comparatively expensive components made of non-ferrous metals and having polished surface or complex geometry (inner cavities), which can be damaged during cleaning or tolerate no efficient cleaning with any other methods.

This work was carried out in Tver State University with the support of Ministry of Education and Science of the Russian Federation in the framework of accomplishment of Federal Targeted program “Investigation and Engineering in High-Priority Lines of Development of Science and Technology in Russia for 2014–2020” agreement 14.577.21.0004.

keywords Reflectivity, mirror reflectance, laser-chemical cleaning, optical surface, high-power gas lasers, copper mirrors
References

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