Fabrication and Evaluation of Plasma-Sprayed Functionally Gradient W/Cu Coatings as Plasma Facing Materials in Fusion Devices |
| Journal |
Key Engineering Materials (Volumes 373 - 374) |
| Volume |
Surface Engineering |
| Edited by |
M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu |
| Pages |
31-34 |
| DOI |
10.4028/www.scientific.net/KEM.373-374.31 |
| Online since |
March, 2008 |
| Authors |
Shu Xiang Song,
Wei Zhi Yao,
Zhang Jian Zhou,
Wei Wei Cong,
Yao Ma,
Chang Chun Ge
|
| Keywords |
Functionally Gradient Coating, Plasma Facing Material, Plasma Spraying, W/Cu |
| Abstract |
Tungsten has been decided as the plasma facing material (PFM) for some high heat flux
regions of the divertor in the International Thermo-Nuclear Experimental Reactors (ITER). In this
paper, our efforts concentrated on the functionally gradient W/Cu coating fabricated on the oxygen
free copper by atmosphere plasma spraying under the inert gases protection. The functionally gradient
W/Cu coatings were designed to relieve the thermal stress during the spraying processes. For
comparison, the tungsten coatings were also deposited directly onto the copper substrates by the same
technology. XRD, SEM and EDS were applied to identify the phases, morphologies and compositions
of these coatings. Tensile tests were performed to measure the bonding strength between the coatings
and the substrates. Furthermore, water quenching and high heat loading experiments using a pulse
laser beam were also carried out to estimate the thermal shock properties of these coatings. |
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