Laser Surface Cleaning: Removal of Hard Thin Ceramic Coatings

Marimuthu, Sundar; Kamara, Alhaji M.; Rajemi, Mohamad Farizal; Whitehead, David; Mativenga, Paul; Li, L.

doi:10.1002/9781119185031.ch9

Cited by 4 publications

(5 citation statements)

References 48 publications

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“…However, PVD coatings can be limited by their reduced thickness [2]. Therefore, when coatings get damaged during use, the cutting tool [3] or mold [4] need to be repaired and the coating must be completely stripped off. The removal of thin coatings still remains a challenging task, as any damage to the substrate can have critical consequences [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The removal of thin coatings still remains a challenging task, as any damage to the substrate can have critical consequences [1,5,6]. Traditional methods of coating removal such as mechanical, chemical [4,6] or ion beam milling [7] have their own limitations. For example, mechanical stripping isn't suitable for a thin PVD coating layer with high adhesion to a substrate [4].…”

Section: Introductionmentioning

confidence: 99%

“…Traditional methods of coating removal such as mechanical, chemical [4,6] or ion beam milling [7] have their own limitations. For example, mechanical stripping isn't suitable for a thin PVD coating layer with high adhesion to a substrate [4]. On the other hand, while chemical stripping is a suitable method for the removal of PVD coatings, the toxic waste caused by the proces is problematic [4].…”

Section: Introductionmentioning

confidence: 99%

“…For example, mechanical stripping isn't suitable for a thin PVD coating layer with high adhesion to a substrate [4]. On the other hand, while chemical stripping is a suitable method for the removal of PVD coatings, the toxic waste caused by the proces is problematic [4]. A promising technology for selective coating removing is focused ion beam milling.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of a Method for Selective and Precise Laser De-Coating

Primus

Hlavinka

Zeman

et al. 2023

Lasers Manuf. Mater. Process.

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Coatings are used in many industrial applications as a protective barrier, improving component properties such as friction, wear resistance, and thermal resistivity. When components become worn, any coatings must be thoroughly removed before performing repairs. Laser stripping is a relatively new technology developed for the entire coating removal. So far, only laser stripping of the entire coatings has been discussed in literature, but its application in selective de-coating layer by layercan extend the usage of this technique. Herein, we describe a new method of selective and precise laser de-coating layer by layer in layer thickness lower than 0,15 μm and demonstrate tise technique on two coatings, namely AlTiN and diamond-like carbon. This method is based on ablation threshold measurement and the application of low laser beam fluences for selective de-coating, layer by layer, in a defined pattern. Then the average minimal removals per layer were estimated for both coatings using first and second harmonic wavelengths. Finally, the usage of this method was proved by chemical analysis of the de-coated areas. The presented method can extend the use of laser coating stripping from actual removal of whole coatings to new areas, for example thickness measurement or inter-layer inspection of coatings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of a Method for Selective and Precise Laser De-Coating

Primus

Hlavinka

Zeman

et al. 2023

Lasers Manuf. Mater. Process.

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show abstract

“…The second mentioned variant is a very precise technology, where the accuracy of the stripped thin coating is in the order of tens of micrometers (±0,5µm) in the case of long pulses τp = 10µs by study from [Zivelonghi 2017]. When USP lasers are used (τp > 10ps), the stripped layer is more accurate and no damage to the substate is observable [Marimuthu 2018]. Laser stripping is also advantageous in other aspects: suitability for problematic Diamond-like-Carbon (DLC, CVD-D) based coatings (due to nonmachinability by standard stripping techniques), the possibility of removal only upper layers from multilayer coatings, low durations of processes and applicability only to functional surfaces of cutting tools [Marimuthu 2010].…”

Section: Introductionmentioning

confidence: 99%

Segmental Laser Stripping of Thin Coatings on Monolithic Cutting Tools

CERMAK¹,

KOZMIN²,

SYROVATKA³

et al. 2022

MM SJ

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This study outlines the methodology of the new approach of laser stripping technique in functional surfaces of monolithic cutting tools. Starting from the initialization test of the coating thickness using a laser calotest including beam-material interaction test, through the introduction of the main geometrical elements necessary for the analysis of the tool, the study discusses segmental laser stripping including its evaluation, where the effects of different segment modifications (overlapping, resizing, rotation or reordering) were investigated. The influence of the presented technology on the microgeometry of the tool was beneficial from several points of view: the area around the cutting edge can be influenced by the polarization of the laser beam and the resulting radius values show no negative influence of the substrate by the laser.

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