Laser-Assisted Additive Fabrication of Micro-Sized Coatings

Mahamood, Rasheedat M.; Akinlabi, Esther Titilayo

doi:10.1016/b978-0-08-101252-9.00021-2

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…This approach, which uses explosive lithography, is extremely labor intensive and sensitive to layer matching errors. For some applications that do not require high spatial resolution, an additive method of growing PCBs from the gas phase with local stimulation of the process by focused laser radiation (laser chemical vapor deposition (LCVD) [7] or deposition from the liquid phase [8] can be applied. However, these processes take place at low scanning speed and require a substrate material with high absorption at the wavelength of the writing laser.…”

Section: Methods For Making Dpps With Changing Film Thicknessesmentioning

confidence: 99%

Thermochemical laser writing of chromium grayscale masks and their application for fabrication of multilevel diffractive optical elements

Kuts,

Korolkov,

Sametov

et al. 2023

Holography, Diffractive Optics, and Applications XIII

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The paper presents the results of developing a technology for direct laser writing of grayscale photomasks on thin (30-50 nm) chromium films. The contrast of grayscale microimages reaches 10, which is comparable to the characteristics of LDW-glass. The technique is based on dependence of chromium oxide layer thickness formed at laser heating on exposure dose. The oxide layer is then used as a analog mask for underlaying Cr film. The written grayscale masks are used to fabricate multilevel diffractive optical elements by the method of grayscale lithography. The photoresist layer was exposed by contact printing through the grayscale mask. Diffractive optical elements with a sawtooth profile depth in the range of 1-4 μm are made. The angle of the backward slope of the diffractive zones was 60 degrees. The article discusses examples of the use of chromium grayscale masks for fabrication of various 3D structures.

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Section: Methods For Making Dpps With Changing Film Thicknessesmentioning

confidence: 99%

Thermochemical laser writing of chromium grayscale masks and their application for fabrication of multilevel diffractive optical elements

Kuts,

Korolkov,

Sametov

et al. 2023

Holography, Diffractive Optics, and Applications XIII

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“…Laser-cladding with ceramics has become a widely used technique to improve the corrosion resistance, wear resistance and biocompatibility of metals such as titanium alloys. Ceramic coatings have high heat and high wear resistance properties which makes them ideal for application on biomedical implants and other applications in high wear environments [10].…”

Section: Existing Surface Treatment Advancements On Titaniummentioning

confidence: 99%

UQ eSpace

Hrstich¹

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In this study, the laser cladding process was utilised to deposit a thick ceramic layer of TiO2 onto a Ti6Al4V metal alloy substrate to improve the wear properties at the surface. A custom made powder was compared to a commercially available powder and testing was completed at high scan speeds with increasing laser powers. The results showed that Marangoni convection occurs in the clad melt which will affect the properties of the surface treatment. The custom powder was found to have a less consistent track formation than the commercially available powder, but its track dimensions were much more suitable for producing a full surface layer. The custom powder was found to have less defects such as cracking, porosity and delamination compared to the commercially available powder. Increasing the laser scan speed increased the height and width of the clad track, while lowering the contact angle. However this did slightly increase the number of defects within the clad layer.

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“…The cladding material is melted by energy from the laser beam, forming a melt pool with the substrate and achieving a metallurgical bond (Tian et al, 2005). These coatings can protect the base material in high temperature and high stress environments, while also improving corrosion and wear resistance (Mahamood & Akinlabi, 2018). A number of previously completed studies have produced ceramic coatings, significantly improving the surface properties of the components.…”

Section: Aims and Objectivesmentioning

confidence: 99%

“…The high strength to weight ratio and superior corrosion resistance of titanium alloys has seen to their wide use throughout the aerospace industry. Despite this, surface modification is often required in many applications because of the poor wear behaviour of these alloys (Mahamood & Akinlabi, 2018). Surface coatings can be used to protect and further improve components used in high-performance applications (Aboulkhair, Maskery, Tuck, Ashcroft, & Everitt, 2016).…”

Section: Ceramic Coatings For Titanium Alloysmentioning

confidence: 99%

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UQ eSpace

Duke¹

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Laser-Assisted Additive Fabrication of Micro-Sized Coatings

Cited by 6 publications

References 32 publications

Thermochemical laser writing of chromium grayscale masks and their application for fabrication of multilevel diffractive optical elements

Thermochemical laser writing of chromium grayscale masks and their application for fabrication of multilevel diffractive optical elements

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