Influences of Dispersed Lanthanum Oxide Additive on the Properties of Tungsten-Based Plasma-Facing Material
Influences of Dispersed Lanthanum Oxide Additive on the Properties of Tungsten-Based Plasma-Facing Material
复制标题
DOI：
10.13182/fst13-738
复制
发表时间：
2014-10
影响因子：
0.9
通讯作者：
D. Zhu;J. Chen;Z. Zhou;R. Yan;R. Ding
中科院分区：
文献类型：
--
作者：
D. Zhu;J. Chen;Z. Zhou;R. Yan;R. Ding
摘要：为了研究分散氧化镧（La2O3）添加剂对钨（W）基等离子体材料性能的影响，采用超高压电阻烧结法成功制备了超细晶W-1% La2O3复合材料，该复合材料可以抑制烧结过程中W晶粒的生长。对其相对密度、维氏显微硬度、微观结构和热导率进行了分析，并与纯钨进行了比较。此外，还评估了其在聚变相关条件下的行为，即 HT-7 托卡马克中的边缘等离子体加载和高强度脉冲离子束模拟的瞬态热通量。结果表明，在没有分散颗粒的细晶强化作用的情况下，La2O3添加剂作为第二相颗粒分散在W基等离子体材料中会降低材料在等离子体热载荷下的抵抗能力。
Abstract To investigate the influences of dispersed lanthanum oxide (La2O3) additive on the properties of a tungsten (W)-based plasma-facing material, ultrafine-grained W-1% La2O3 composite has been successfully fabricated using the resistance sintering under ultrahigh pressure method, which can suppress W grain growth during sintering processes. Its relative density, Vickers microhardness, microstructure, and thermal conductivity have been analyzed and compared with those of pure W. Moreover, its behaviors under fusion-related conditions, i.e., edge plasma loading in the HT-7 tokamak and transient heat flux simulated by a high-intensity pulsed ion beam, have been evaluated. It is shown that without the fine-grain strengthening effect of dispersed particles, the La2O3 additive as second-phase particles being dispersed in W-based plasma-facing material degrades the material resistance ability under plasma heat loading.