Optical characterization of laser coloured titanium under different processing atmospheres

Khafaji, Noor Yasir; Demir, Ali Gökhan; Vitali, Luigi; Fustinoni, Damiano; Niro, Alfonso; Previtali, Barbara; Taha, Ziad A.

doi:10.1016/j.surfcoat.2017.04.043

Cited by 15 publications

(9 citation statements)

References 23 publications

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“…Щедрина 1 ; Д.С . Лутошина 1 ; Д. А. Антипенкова 1 ; М. С. Кутепова 1 1 Университет ИТМО, Санкт-Петербург 2 ООО "Лазерный центр", Санкт-Петербург 3 ООО "Проколорит", Санкт-Петербург Представлена технология "Colorit" цветной лазерной маркировки металлов, в том числе и драгоценных, которая позволяет наносить цветное изображение без использования пигментов и красителей. Технология маркировки базируется на различных оптических эффектах: интерференции, дифракции света и поверхностного плазмонного резонанса.…”

Section: возможности технологии цветной лазерной маркировки "Colorit"unclassified

“…It is known that when certain metals are heated in air, an oxide film is formed on their surface, due to the interference of light where the color changes. Based on this effect, the technology of color metal laser of [2] (commercial name "Colorit" [3]) was developed. The technology is an analog of monochrome laser engraving in color and makes it possible to obtain a color stable image with a high resolution on a metal surface with a high degree of protection against falsification.…”

Section: Is It Possible To Obtain Color From Air?mentioning

confidence: 99%

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Prospects of "Colorit" Technology of Color Laser Labeling

Одинцова¹,

Veiko²,

Gorniy³

et al. 2018

FRos

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Colorit" technology of color laser labeling of metals, including precious ones, is presented, which allows to apply a color image without the use of pigments and dyes. The labeling technology is based on various optical effects: interference, diffraction of light and surface plasmon resonance. The images are of high resolution and have several degrees of protection, which makes it possible to use the method to protect products from falsification.

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Section: возможности технологии цветной лазерной маркировки "Colorit"unclassified

Section: Is It Possible To Obtain Color From Air?mentioning

confidence: 99%

Prospects of "Colorit" Technology of Color Laser Labeling

Одинцова¹,

Veiko²,

Gorniy³

et al. 2018

FRos

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“…The color change induced by fs laser machining has been studied extensively for metal substrates. 8,9 In contrast, the investigation into the alteration of color in laser irradiated polymers is scarce. 10,11 Most studies on fs laser micromachining of polymers have focused on surface feature formation.…”

Section: Introductionmentioning

confidence: 99%

Colored Poly(vinyl chloride) by Femtosecond Laser Machining

Ahmmed

Mafi

Kietzig

2018

Ind. Eng. Chem. Res.

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Colored poly(vinyl chloride) (PVC) was fabricated by femtosecond laser micromachining without the addition of chemical colorants, eliminating the concern of leaching dyes and pigments. We determined that the changes in surface chemistry and surface topography both contribute to the observed yellow, brown, and black color formation. X-ray photoelectron spectroscopy (XPS) on the machined samples showed that conjugated double bonds are liable for the yellow and brown colors, whereas the presence of oxidized carbon and surface topography contribute to the black color. Fourier transform infrared spectroscopy (FTIR) indicated that laser irradiation altered the material’s properties only near the surface, which left the bulk properties unaltered. Furthermore, chemical resistance tests showed that some of the samples were able to withstand the influence of aggressive chemicals and their color did not fade. Finally, we showed that the fabrication of colored PVC highly depends on its ablation energy threshold which is affected by the laser pulse duration and wavelength.

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“…Numerous types of metal and alloy substrates can undergo laser oxidation to form transparent oxide layers. Through the interference effect, the oxide layer allows the substrate to display a variety of colors [9,15,16]. Of the two methods, laser oxidation has been gaining popularity, as it is comparatively less complex and low cost, and therefore potentially more practical.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, researchers have supplemented existing methods with additional steps to expand the range and vibrancy of colors generated. These include pre-heating the substrate before coloration, locating the samples off the focal plane [7], and performing the laser irradiation process in different gas environments or underwater [16,19].…”

Section: Introductionmentioning

confidence: 99%

Tunable Coloring via Post-Thermal Annealing of Laser-Processed Metal Surface

Zhou

Huang

et al. 2018

Applied Sciences

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Featured Application: Color-generation on metals and semiconductors is of great interest in a wide range of applications, including imprinting identification codes, decorative artwork, and other types of useful information storage.Abstract: Thermal annealing is performed as a post treatment to tune the color generated by pulsed laser processing of a titanium substrate surface. A comparison of the reflectance spectra before and after thermal annealing shows the peak shift, as well as an increase in overall reflectance, which demonstrates that the color hue changes and the lightness of color increases. Microscope image shows that additional blue and yellow colors on the titanium surfaces are generated through the thermal annealing treatment. Further analyses show that the rate and area of the color shift depend on the annealing temperature and duration. Chemical composition analyses reveal that a TiO 2 layer is generated after the laser processing of the titanium surface. Post-thermal annealing causes further oxidation and generates Ti 2 O 3 . The tuning process and mechanism behind it are discussed.

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Optical characterization of laser coloured titanium under different processing atmospheres

Cited by 15 publications

References 23 publications

Prospects of "Colorit" Technology of Color Laser Labeling

Prospects of "Colorit" Technology of Color Laser Labeling

Colored Poly(vinyl chloride) by Femtosecond Laser Machining

Tunable Coloring via Post-Thermal Annealing of Laser-Processed Metal Surface

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