Plasma cleaning technique for the removal of mixed materials

Vassallo, E.; Cremona, A.; Dell’Era, F.; Ghezzi, F.; Grosso, G.; Laguardia, L.

doi:10.1016/j.fusengdes.2011.04.025

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Consequently, researchers are encouraged to develop "dry" and efficient cleaning processesthat are not harmful to the environment and minimize the waste generation while, at the same time, save the substrate integrity. As a matter of fact, different dry cleaning technologies have been developed recently such as laser stripping [5], plasma cleaning [6] or CO2 dry-ice blasting [7]. Even more recently, High Pressure Cryogenic N2 Jet cleaning, which is the purpose of this communication, was introduced.…”

Section: Introductionmentioning

confidence: 99%

High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal: Experimental Study of Polyamide Ablation

Hajji

Entemeyer

Serri

et al. 2018

MSF

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The potential of a recently developed technique that uses a clean supercritical High Pressure Cryogenic Nitrogen Jet (HPCryoN2Jet) for surface ablation and cleaning is depicted. In contrast to existent coating-removal techniques (chemical stripping, hydro-blast, water jet cleaning...), as nitrogen is naturally recycled in the air, this process has a high potential for surface treatment without any chemical and physical effluents or sewage disposal. The treatment consists in impacting the surface with a high pressure (up to 3500 bar) cryogenic nitrogen jet (down to-160°C). The pressurized cryogenic nitrogen exits from a nozzle - having generally a 0.2 to 0.5 mm diameter outlet - to form the high velocity (supersonic) nitrogen jet. In this contribution, the ability of the process to remove polymeric (PA) coatings is evaluated on different types of metallic substrates (Cu, Al, E24, 316L stainless steel). The mechanisms of chip formation have been visualized using a high speed camera. Coating failure is shown experimentally to occur downstream of the jet and the influence of the substrate thermal properties on the stripping efficiency of the PA coating is highlighted.

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Section: Introductionmentioning

confidence: 99%

High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal: Experimental Study of Polyamide Ablation

Hajji

Entemeyer

Serri

et al. 2018

MSF

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Plasma Radiofrequency Discharges as Cleaning Technique for the Removal of C–W Coatings

et al. 2012

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Removing of Mixed Coatings by Plasma Discharges

et al. 2013

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Next generation tokamaks offer the possibility of highly efficient energy generation from the fusion reaction of hydrogen isotopes. In tokamak operation, the core plasma interaction with the wall materials could produce tiles erosion. Redeposition of the eroded materials (C–W–Be) leads to an increase in the allowable tritium load if the coatings are not periodically removed. Amongst removal methods, plasma based techniques employing Ar, H2 gas have been investigated. Plasma cleaning has been carried out on hydrogenated carbon and carbon–tungsten coatings. It has been shown hat at a RF power density of 1.3 W/cm2 (pressure of 1 Pa), the plasma cleaning was effective in removing the coatings. Details of further work in this research activity will be presented

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Plasma cleaning technique for the removal of mixed materials

Cited by 4 publications

References 17 publications

High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal: Experimental Study of Polyamide Ablation

High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal: Experimental Study of Polyamide Ablation

Plasma Radiofrequency Discharges as Cleaning Technique for the Removal of C–W Coatings

Removing of Mixed Coatings by Plasma Discharges

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