RT Conference Proceedings
T1 Influence of processing route and yttria additions on the oxidation behavior of tungsten
A1 Muñoz Castellanos, Ángel
A1 Monge Alcázar, Miguel Ángel
A1 Cifuentes Cuéllar, Sandra Carolina
A1 Pérez, P.
AB The oxidation resistance in dry air of pure tungsten and tungsten reinforced with a dispersion of 0.6 wt.% Y₂O₃ nanoparticles has been evaluated between 873 and 1073 K, temperature range that divertor in fusion power plants should endure during long-term times in the case of loss of coolant accident and/or air ingress in the vessel. Both materials were prepared by a powder metallurgy route involving hot isostatic pressing of ball milled tungsten powders and tungsten with dispersed Y₂O₃ nanoparticles. The results have been compared with those of pure tungsten processed by conventional techniques. Thermogravimetric tests at 873 K revealed that the processing route as well as yttria addition considerably affected the oxidation resistance of pure tungsten. Mass gain of W-0.6Y₂O₃ at 873 K was five and two times lower than that of pure tungsten prepared by conventional processing techniques and by powder metallurgy, respectively. This different behavior was related to changes in the structure and composition of the oxide scale. Above 873 K, the kinetics were significantly accelerated for all materials due to the development of a non-protective oxide scale from the earliest oxidation stages, although the kinetics of Y₂O₃-containing material were still the slowest, specially at 973 K. It was analyzed how yttria additions modify the oxidation mechanism of tungsten.
PB Elsevier
SN 0022-3115
YR 2011
FD 2011-10
LK https://hdl.handle.net/10016/19808
UL https://hdl.handle.net/10016/19808
LA eng
NO This  study is for: The Fifteenth International Conference on Fusion Reactor Materials (ICFRM-15) was held October 16–22,  2011, at the Charleston Marriott Hotel in Charleston, South Carolina (American United States).
NO Consejería de Educación de la Comunidad de Madrid through the program ESTRUMAT-CM S2009MAT-1585 and by the Ministerio de Innovación y Ciencia (Project ENE2008-06403-C06-04). The additional subvention from EURATOM/CIEMAT association through contract EFDA WP11-MAT-WWALLOY.
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RD 30 jun. 2024