High heat flux properties of pure tungsten and plasma sprayed tungsten coatings on carbon substrates have been studied by annealing and cyclic heat loading. The recrystallization temperature and an activation energy Q R = 126 kJ/mol for grain growth of tungsten coating by vacuum plasma spray (VPS) were estimated, and the microstructural changes of multi-layer tungsten and rhenium interface pre-deposited by physical vapor deposition (PVD) with anneal temperature were investigated. Cyclic load tests indicated that pure tungsten and VPS-tungsten coating could withstand 1000 cycles at 33-35 MW/m2 heat flux and 3 s pulse duration, and inert gas plasma spray (IPS)-tungsten coating showed local cracks by 300 cycles but did not induce failure by further cycles. However, the failure of pure tungsten and VPS-tungsten coating by fatigue cracking was observed under higher heat load (55-60 MW/m2) for 420 and 230 cycles, respectively.
|ジャーナル||Journal of Nuclear Materials|
|号||1-3 PART A|
|出版ステータス||出版済み - 8 1 2004|
|イベント||Proceedings of the 11th Conference on Fusion Research - Kyoto, 日本|
継続期間: 12 7 2003 → 12 12 2003
All Science Journal Classification (ASJC) codes