Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6746404 | Fusion Engineering and Design | 2013 | 5 Pages |
Abstract
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 2Â mm deposited by a fast rate of about 0.7Â mm/h. The features of the CVD-W 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 14.5Â MW/m2 and 30Â s pulse duration. Thermal fatigue tests showed that the CVD-W mock-up could sustain 1000 cycles at a heat load of 11.7Â MW/m2 absorbed power density and 15Â s pulse duration without visible failure.
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Authors
Youyun Lian, Xiang Liu, Zengyu Xu, Jiupeng Song, Yang Yu,