Excimer laser decoating of chromium titanium aluminium nitride to facilitate re-use of cutting tools

Sundar, M.; Whitehead, David; Mativenga, Paul; Li, L.; Cooke, Kevin

doi:10.1016/j.optlastec.2009.04.003

Cited by 18 publications

(14 citation statements)

References 22 publications

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“…Thinfilm removal using nanosecond excimer laser ablation has huge potential to ablate a wide range of materials [15][16][17][18] in a controllable manner. Recently, this group of authors reported an investigation [19,20] on the effectiveness of the nanosecond excimer laser based process for stripping TiN and CrTiAlN coatings. This paper is a continuation of this research into the stripping of TiAlN coating from WC substrate.…”

Section: Introductionmentioning

confidence: 99%

Laser stripping of TiAlN coating to facilitate reuse of cutting tools

Marimuthu

Kamara

Whitehead

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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The potential of using the laser ablation process to perform controlled stripping of titanium aluminium nitrite (TiAlN) coating from tungsten carbide (WC) substrate is explored in this paper. TiAlN coatings are extensively used in cutting tools to improve machining capability, and to extend the life of the tools. However, if any error is detected on the coated tools, or when the tooling needs to be reused, it is mandatory to remove the existing coating to facilitate reshaping/recoating. The existing coating removal process uses chemical stripping methods, which are not environmentally friendly and not suitable for selective coating removal. In the present work, excimer laser removal of TiAlN from coated WC flat plates has been studied and demonstrated as a viable alternative to existing chemical stripping methods. The ablation thresholds of the TiAlN coating and WC substrate were identified as 1.85 J/cm 2 and 2.3 J/cm 2 respectively. The paper also presents experimental and theoretical evidence of the process mechanism responsible for laser stripping of TiAlN coatings

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Section: Introductionmentioning

confidence: 99%

Laser stripping of TiAlN coating to facilitate reuse of cutting tools

Marimuthu

Kamara

Whitehead

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Explosive removal of coating followed by evaporation is evident by the absence of material redeposition once the process is completed. 11,[16][17][18][19][20] Latest developments in cutting tool de-coating have led to a renewed interest in de-coating studies. Table 1 presents a summary of the studies that investigated the use of lasers for de-coating various substrate types.…”

Section: Literature Reviews For Laser De-coatingmentioning

confidence: 99%

“…Using an excimer laser, Sundar et al 19,20 reported that 3 μm thick TiN and 2 μm thick CrTiAlN coatings were successfully removed from WC and HSS flat substrates, respectively. In a subsequent study, the authors evaluated laser de-coating processes on micro milling cutter tools.…”

Section: Literature Reviews For Laser De-coatingmentioning

confidence: 99%

Laser de-coating of hard DLC coatings from tungsten carbide cutting tool

Hassan

Mativenga

Rajab

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser irradiation de-coating is a promising new approach for effective coating removal of cutting tools. While this method has demonstrated feasibility for conventional coatings, its use and efficacy on lubricant coating is however yet to be ascertained. This paper reports on the results of excimer laser de-coating of hard DLC from DLC-coated tungsten carbide (WC) substrates. A range of fluence and pulse was studied to evaluate the effectiveness of the de-coating process. Result shows that laser parameters of 7 J/cm2 fluence, 400 pulse and 25 Hz frequency were found to yield optimum results in removing hard DLC coating of 3.2 μm thickness from WC substrates. The experimental work indicated successful laser de-coating of hard DLC coating without noticeable damage to the WC substrate. The capability of this new de-coating process is significant in the aerospace industry as it could facilitate re-grinding and recoating of drills thereby improving economics of manufacturing. The process windows could also be applied in the removal of DLC from other cutting tools and applications.

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“…The etch rate and surface quality are function of four main variables: (i) beam size, (ii) laser power or energy per pulse (or fluence), (iii) stage velocity, and (iv) step distance between each scanned lines. These variables have also been considered in other studies in the context of protective coating removal from cutting tools [7,9].…”

Section: Process Optimizationmentioning

confidence: 99%

“…The etch rate was found to depend on the laser wavelength and the fluence, the number of pulses and the pulse length. More recently, laser stripping of Ti-based protective coatings has also been studied more extensively [6][7][8][9] in order to re-use WC micro-tools or steel substrates.…”

Section: Introductionmentioning

confidence: 99%