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Recent research and development of thick CVD tungsten coatings for fusion application

tungsten 2020年第1期2卷 83-93页

作者： Zhe Chen You‑Yun Lian Xiang Liu Fan Feng Bin‑You Yan Jian‑Bao Wang Yan‑Wei Lv Jiu‑Peng Song Chun‑Jia Liu Lai‑Zhong Cai Southwestern Institute of Physics Chengdu 610041China China National R&D Center for tungsten Technology Xiamen Tungsten Co.Ltd.Xiamen 361009China

As the interface closest to the edge plasma of a fusion reactor reacting deuterium(D)and tritium(T),plasma-facing material(PFM)need to withstand extreme service conditions with the high particle flux,high heat load,and neutrons with energy up to 14.1 ***(W)is the primary candidate of PFMs in future fusion reactors due to its high melting point,good thermal conductivity,excellent irradiation resistance,and low hydrogen/helium *** far,powder metallurgy is a leading route for the preparation of W-based *** alternative approach could be the coating technique,which has advantages on fabricating W PFMs and plasma-facing component(PFC)*** the past several years,inspiring results were achieved in the preparation process and performance evaluation of the W coating with high purity,excellent thermal conductivity,and thickness at the millimeter level by atmospheric pressure chemical vapor deposition(APCVD).No obvious grain growth and hardness decrease were observed when the annealing temperature was lower than 1500°C,indicating its good thermal *** as-deposited coating exhibited a comparable thermal shock resistance with the conventional W *** the polished sample showed a high crack threshold(0.33-0.44 GW·m^(−2))when exposed to edge localized mode like transient at room temperature,compared to the unpolished *** performance of the chemical vapor deposition(CVD)-W exposed to deuterium(D)plasma and fission neutron were also ***,the practicality of preparation of large-scale W-based PFM by this technique is also *** paper gives a short overview on the recent research and development status of the thick W coating prepared by APCVD at Xiamen tungsten Co.,Ltd and Southwestern Institute of Physics for using as PFM and PFC in fusion devices.

关键词： tungsten coatings Chemical vapor deposition Plasma-facing materials Plasma-facing component

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Erosion and Modifications of tungsten-Coated Carbon and Copper Under High Heat Flux

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Plasma Science and Technology 2003年第4期5卷 1887-1894页

作者：刘翔 S.Tamura K.Tokunaga N.Yoshida 张斧许增裕葛昌纯 N.Noda Southwestern Institute of Physics Chengdu 610041China Research Institute for Applied Mechanics Kyushu University6-1 Kasuga-parkKasugaFukuoka 816-8580Japan Laboratory of Special Ceramics and Powder Metallurgy University of Science and Technology BeijingBeijing 100083China National Institute for Fusion Science TokiGifu 509-5292Japan

tungsten-coated carbon and copper was prepared by vacuum plasma spraying (VPS) and inert gas plasma spraying (IPS), respectively. W/CFC (tungsten /Carbon Fiber-Enhanced material) coating has a diffusion barrier that consists of W and Re multi-layers pre-deposited by physical vapor deposition on carbon fiber-enhanced materials, while W/Cu coating has a graded transition interface. Different grain growth processes of tungsten coatings under stable and transient heat loads were observed, their experimental results indicated that the recrystallizing temperature of VPS-W coating was about 1400 ℃ and a recrystallized columnar layer of about 30 μm thickness was formed by cyclic heat loads of 4 ms pulse duration. Erosion and modifications of W/CFC and W/Cu coatings under high heat load, such as microstructure changes of interface, surface plastic deformations and cracks, were investigated, and the erosion mechanism (erosion products) of these two kinds of tungsten coatings under high heat flux was also studied.

关键词： plasma spraying tungsten coatings recrystallization plastic deformation erosion products

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