作者: D.P. Adams , V.C. Hodges , D.A. Hirschfeld , M.A. Rodriguez , J.P. McDonald
DOI: 10.1016/J.SURFCOAT.2012.12.044
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摘要: Abstract Nanosecond-pulsed, infrared (1064 nm) laser irradiation was used to create metal oxide coatings on the surface of polished stainless steel 304L austenite for application as color markings and unique tags/identifiers. By rastering a Gaussian-shaped, focused beam across specimen in air, continuous were grown thicknesses range 20 ~ 500 nm. Oxide coating thickness generally increased with fluence. However, large accumulated fluences excess ~ 600–800 J/cm2, growth affected by evaporation particle ejection resulting decreased thickness. Transmission electron microscopy X-ray diffraction revealed that developed polycrystalline, spinel structure having lattice constant = 8.4 A (consistent MnCr2O4 Fe3O4). Pulsed modified composition substrates reducing Cr Mn concentration within melt zone. The reflectance chromaticity laser-fabricated characterized using spectrophotometry. These optical properties are described context measured thicknesses.