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Macroparticle generation in DC arc discharge from a WC cathode
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Plansee Composite Mat GmbH, Germany.
Plansee Composite Mat GmbH, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
2017 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 121, no 10, article id 103305Article in journal (Refereed) Published
Abstract [en]

We have studied macroparticle generation from a tungsten carbide cathode used in a dc vacuum arc discharge. Despite a relatively high decomposition/ melting point (similar to 3100 K), there is an intensive generation of visible particles with sizes in the range 20-35 mu m. Visual observations during the discharge and scanning electron microscopy of the cathode surface and of collected macroparticles indicate a new mechanism for particle formation and acceleration. Based on the W-C phase diagram, there is an intensive sublimation of carbon from the melt resulting from the cathode spot. The sublimation supports the formation of a sphere, which is accelerated upon an explosion initiated by Joule heating at the critical contact area between the sphere and the cathode body. The explosive nature of the particle acceleration is confirmed by surface features resembling the remains of a splash on the droplet surface. Published by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2017. Vol. 121, no 10, article id 103305
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-136594DOI: 10.1063/1.4978306ISI: 000397420600010OAI: oai:DiVA.org:liu-136594DiVA, id: diva2:1089980
Note

Funding Agencies|Swedish Research Council (VR) [642-2013-8020]; Knut and Alice Wallenberg (KAW) Foundation [KAW 2015.0043]; Swedish Foundation for Strategic Research (SSF) synergy [FUNCASE]

Available from: 2017-04-21 Created: 2017-04-21 Last updated: 2017-05-05

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