Recent research and development of thick CVD tungsten coatings for fusion application
作者机构：Southwestern Institute of PhysicsChengdu 610041China China National R&D Center for Tungsten TechnologyXiamen Tungsten Co.Ltd.Xiamen 361009China
出 版 物：《Tungsten》 (钨科技（英文）)
年 卷 期：2020年第2卷第1期
页 面：83-93页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学]
基 金：This work is financially supported by the National Magnetic Confinement Fusion Program of China(Grant No.2018YFE0312100) the National Natural Science Foundation of China(Grant Nos.11975092 and 11905045).
主 题：Tungsten coatings Chemical vapor deposition Plasma-facing materials Plasma-facing component
摘 要：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 MeV.Tungsten(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 retention.So far,powder metallurgy is a leading route for the preparation of W-based PFM.An alternative approach could be the coating technique,which has advantages on fabricating W PFMs and plasma-facing component(PFC)simultaneously.In 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 stability.The as-deposited coating exhibited a comparable thermal shock resistance with the conventional W bulk.While 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 counterpart.Irradiation performance of the chemical vapor deposition(CVD)-W exposed to deuterium(D)plasma and fission neutron were also evaluated.Additionally,the practicality of preparation of large-scale W-based PFM by this technique is also demonstrated.This 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.
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