Influences of Dispersed Lanthanum Oxide Additive on the Properties of Tungsten-Based Plasma-Facing Material

To investigate the influences of dispersed lanthanum oxide (La 2 O 3 ) additive on the properties of a tungsten (W)-based plasma-facing material, ultrafine-grained W-1% La 2 O 3 composite has been successfully fabricated using the resistance sintering under ultrahigh pressure method, which can suppr...

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Bibliographic Details
Published in:Fusion science and technology 2014-10, Vol.66 (2), p.337-342
Main Authors: Zhu, D. H., Chen, J. L., Zhou, Z. J., Yan, R., Ding, R.
Format: Article
Language:English
Subjects:
Additives
Density
Dispersion
Heat transfer
Lanthanum oxides
Particulate composites
Tungsten
Vickers microhardness
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Summary:To investigate the influences of dispersed lanthanum oxide (La 2 O 3 ) additive on the properties of a tungsten (W)-based plasma-facing material, ultrafine-grained W-1% La 2 O 3 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 La 2 O 3 additive as second-phase particles being dispersed in W-based plasma-facing material degrades the material resistance ability under plasma heat loading.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST13-738