A novel method using a high power diode laser to selectively remove cobalt binder from the outermost layer of Co-cemented tungsten carbide (WC-Co 5.8. wt.%) is hereby discussed. A continuous 940-nm wavelength diode laser source at power of 600-1500. W and scanning speed of 1 mm/s was used to perform the thermal treatments. Hot Filament-Chemical Vapour Deposition (HF-CVD) was then used to deposit PolyCrystalline Diamond (PCD) coatings. Increasing the laser fluence, Co-binder was progressively and selectively evaporated from the WC-Co substrate. The selective removal of the Co-binder from the outermost layer of WC-Co induces a significant corrugation of the substrate, very promising to deposit on it high quality diamond with improved adhesion. Indeed, too much high laser fluence must be avoided, as it would tend to induce the resintering or the local melting of the tungsten carbide grains.

A novel method using a high power diode laser to selectively remove cobalt binder from the outermost layer of Co-cemented tungsten carbide (WC-Co 5.8 wt.%) is hereby discussed. A continuous 940-nm wavelength diode laser source at power of 600-1500W and scanning speed of 1 mm/s was used to perform the thermal treatments. Hot Filament-Chemical Vapour Deposition (HF-CVD) was then used to deposit PolyCrystalline Diamond (PCD)coatings. Increasing the laser fluence, Co-binder was progressively and selectively evaporated from the WC-Co substrate. The selective removal of the Co-binder from the outermost layer of WC-Co induces a significant corrugation of the substrate, very promising to deposit on it high quality diamond with improved adhesion. Indeed, too much high laser fluence must be avoided, as it would tend to induce the resintering or the local melting of the tungsten carbide grains. (C) 2011 Elsevier B.V. All rights reserved.

Adhesion and wear resistance of CVD diamond coatings on laser treated WC-Co substrates / M., Barletta; Gisario, Annamaria; G., Rubino. - In: WEAR. - ISSN 0043-1648. - ELETTRONICO. - 271:9-10(2011), pp. 2016-2024. (Intervento presentato al convegno 18th International Conference on Wear of Materials (WOM) tenutosi a Philadelphia, PA nel APR 03-07, 2011) [10.1016/j.wear.2011.01.042].

Adhesion and wear resistance of CVD diamond coatings on laser treated WC-Co substrates

GISARIO, ANNAMARIA;
2011

Abstract

A novel method using a high power diode laser to selectively remove cobalt binder from the outermost layer of Co-cemented tungsten carbide (WC-Co 5.8. wt.%) is hereby discussed. A continuous 940-nm wavelength diode laser source at power of 600-1500. W and scanning speed of 1 mm/s was used to perform the thermal treatments. Hot Filament-Chemical Vapour Deposition (HF-CVD) was then used to deposit PolyCrystalline Diamond (PCD) coatings. Increasing the laser fluence, Co-binder was progressively and selectively evaporated from the WC-Co substrate. The selective removal of the Co-binder from the outermost layer of WC-Co induces a significant corrugation of the substrate, very promising to deposit on it high quality diamond with improved adhesion. Indeed, too much high laser fluence must be avoided, as it would tend to induce the resintering or the local melting of the tungsten carbide grains.
2011
A novel method using a high power diode laser to selectively remove cobalt binder from the outermost layer of Co-cemented tungsten carbide (WC-Co 5.8 wt.%) is hereby discussed. A continuous 940-nm wavelength diode laser source at power of 600-1500W and scanning speed of 1 mm/s was used to perform the thermal treatments. Hot Filament-Chemical Vapour Deposition (HF-CVD) was then used to deposit PolyCrystalline Diamond (PCD)coatings. Increasing the laser fluence, Co-binder was progressively and selectively evaporated from the WC-Co substrate. The selective removal of the Co-binder from the outermost layer of WC-Co induces a significant corrugation of the substrate, very promising to deposit on it high quality diamond with improved adhesion. Indeed, too much high laser fluence must be avoided, as it would tend to induce the resintering or the local melting of the tungsten carbide grains. (C) 2011 Elsevier B.V. All rights reserved.
morphology; diode laser; diamond; adhesion; wear
01 Pubblicazione su rivista::01a Articolo in rivista
Adhesion and wear resistance of CVD diamond coatings on laser treated WC-Co substrates / M., Barletta; Gisario, Annamaria; G., Rubino. - In: WEAR. - ISSN 0043-1648. - ELETTRONICO. - 271:9-10(2011), pp. 2016-2024. (Intervento presentato al convegno 18th International Conference on Wear of Materials (WOM) tenutosi a Philadelphia, PA nel APR 03-07, 2011) [10.1016/j.wear.2011.01.042].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/409093
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