Journal
FUSION ENGINEERING AND DESIGN
Volume 88, Issue 9-10, Pages 1694-1698Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2013.02.155
Keywords
Tungsten coating; Chemical vapor deposition; High heat load; Thermal fatigue
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Tungsten was coated on a W/Cu functionally graded material (FGM) by chemical vapor deposition technique (CVD), and then the tungsten coated tile was brazed on the CuCrZr heat sink with a cooling channel. The thickness of CVD-W was 2 mm deposited by a fast rate of about 0.7 mm/h. The features of the CVDW coating including morphology, element composition and thermal properties were characterized. A tungsten coating with high density, purity and thermal conductivity is achieved. The bonding strength between the CVD-W layer and FGM was measured using bonding tensile tests. Thermal screening and fatigue tests were performed on the CVD-W mock-ups under fusion relevant conditions using an electron beam device. Experimental results showed that the CVD-W mock-up failed by melting of Cu beneath the tungsten layer under a high heat load of 14.5 MW/m(2) and 30s pulse duration. Thermal fatigue tests showed that the CVD-W mock-up could sustain 1000 cycles at a heat load of 11.7 MW/m(2) absorbed power density and 15s pulse duration without visible failure. (C) 2013 Elsevier B.V. All rights reserved.
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