TY - JOUR
T1 - Thermal response of plasma sprayed tungsten coating to high heat flux
AU - Liu, X.
AU - Yang, L.
AU - Tamura, S.
AU - Tokunaga, K.
AU - Yoshida, N.
AU - Noda, N.
AU - Xu, Z.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/10
Y1 - 2004/10
N2 - In order to investigate the thermal response of tungsten coating on carbon and copper substrates by vacuum plasma spray (VPS) or inert gas plasma spray (IPS), annealing and cyclic heat load experiments of these coatings were conducted. It is indicated that the multi-layered tungsten and rhenium interface of VPS-W/CFC failed to act as a diffusion barrier at elevated temperature and tungsten carbides were developed after 1h incubation time when annealing temperature was higher than 1600°C. IPS-W/Cu and W/C without an intermediate bonding layer were failed by the detachment of the tungsten coating at 900 and 1200°C annealing for several hours, respectively. Cyclic heat load of electron beam with 35 MW/m2 and 3-s pulse duration indicated that IPS-W/Cu samples failed with local detachment of the tungsten coating within 200 cycles and IPS-W/C showed local cracks by 300 cycles, but VPS-W/CFC withstood 1000 cycles without visible damages. However, crack creation and propagation in VPS-W/CFC were also observed under higher heat load.
AB - In order to investigate the thermal response of tungsten coating on carbon and copper substrates by vacuum plasma spray (VPS) or inert gas plasma spray (IPS), annealing and cyclic heat load experiments of these coatings were conducted. It is indicated that the multi-layered tungsten and rhenium interface of VPS-W/CFC failed to act as a diffusion barrier at elevated temperature and tungsten carbides were developed after 1h incubation time when annealing temperature was higher than 1600°C. IPS-W/Cu and W/C without an intermediate bonding layer were failed by the detachment of the tungsten coating at 900 and 1200°C annealing for several hours, respectively. Cyclic heat load of electron beam with 35 MW/m2 and 3-s pulse duration indicated that IPS-W/Cu samples failed with local detachment of the tungsten coating within 200 cycles and IPS-W/C showed local cracks by 300 cycles, but VPS-W/CFC withstood 1000 cycles without visible damages. However, crack creation and propagation in VPS-W/CFC were also observed under higher heat load.
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U2 - 10.1016/j.fusengdes.2004.06.002
DO - 10.1016/j.fusengdes.2004.06.002
M3 - Article
AN - SCOPUS:7644235032
VL - 70
SP - 341
EP - 349
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
SN - 0920-3796
IS - 4
ER -