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Proceedings Paper

Application of carbon-aluminum nanostructures in divertor coatings from fusion reactor
Author(s): V. Ciupina; C. P. Lungu; R. Vladoiu; T. D. Epure; G. Prodan; C. Porosnicu; M. Prodan; I. M. Stanescu; M. Contulov; A. Mandes; V. Dinca; V. Zarovschi
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Paper Abstract

Nanostructured carbon materials have increasingly attracted the interest of the scientific community, because of their fascinating physical properties and potential applications in high-tech devices. In the current ITER design, the tiles made of carbon fiber composites (CFCs) are foreseen for the strike point zone and tungsten (W) for other parts of the divertor region. This choice is a compromise based mainly on experience with individual materials in many different tokamaks. Also Carbon-Aluminum composites are the candidate material for the First Wall in ITER. In order to prepare nanostructured carbon-aluminum nanocomposite for the divertor part in fusion applications, the original method thermionic vacuum arc (TVA) was used in two electronic guns configuration. One of the main advantages of this technology is the bombardment of the growing thin film just by the ions of the depositing film. Moreover, the energy of ions can be controlled. Thermo-electrons emitted by an externally heated cathode and focused by a Wehnelt focusing cylinder are strongly accelerated towards the anode whose material is evaporated and bright plasma is ignited by a high voltage DC supply. The nanostructured C-Al films were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM). Tribological properties in dry sliding were evaluated using a CSM ball-on-disc tribometer. The carbon - aluminum films were identified as a nanocrystals complex (from 2nm to 50 nm diameters) surrounded by amorphous structures with a strong graphitization tendency, allowing the creating of adherent and wear resistant films. The friction coefficients (0.1 - 0.2, 0.5) of the C-Al coatings was decreased more than 2-5 times in comparison with the uncoated substrates proving excellent tribological properties. C-Al nanocomposites coatings were designed to have excellent tribological properties while the structure is composed by nanocrystals complex surrounded by amorphous structures with a strong graphitization tendency, allowing the creating of adherent and wear resistant films.

Paper Details

Date Published: 17 October 2012
PDF: 7 pages
Proc. SPIE 8465, Nanostructured Thin Films V, 846508 (17 October 2012); doi: 10.1117/12.930443
Show Author Affiliations
V. Ciupina, Univ. Ovidius Constanta (Romania)
C. P. Lungu, National Institute for Lasers, Plasma and Radiation Physics (Romania)
R. Vladoiu, Univ. Ovidius Constanta (Romania)
T. D. Epure, Univ. Ovidius Constanta (Romania)
G. Prodan, Univ. Ovidius Constanta (Romania)
C. Porosnicu, National Institute for Lasers, Plasma and Radiation Physics (Romania)
M. Prodan, Univ. Ovidius Constanta (Romania)
I. M. Stanescu, Univ. Ovidius Constanta (Romania)
M. Contulov, Univ. Ovidius Constanta (Romania)
A. Mandes, Univ. Ovidius Constanta (Romania)
V. Dinca, Univ. Ovidius Constanta (Romania)
V. Zarovschi, National Institute for Lasers, Plasma and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 8465:
Nanostructured Thin Films V
Tom G. Mackay; Yi-Jun Jen; Raúl J. Martín-Palma, Editor(s)

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