期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 843, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156059
关键词
Hydrothermal process; Ammonium tungsten bronze; In situ oxide dispersion strengthening; Zirconia; Spark plasma sintering
资金
- National Natural Science Foundation of China [51672070, 51874185]
- Henan Province Science and Technology Innovation Talent Plan [2017JQ0012]
In this article, the in situ nanosized Zr(Y)O-2 particles uniformly distributed in the tungsten alloy was successfully prepared through synthesizing doped alpha-HATB powder and spark plasma sintering process. The processing route involves a molecular-level liquid-liquid doping technique that causes a large number of nanosized particles within tungsten grains. The synthesis mechanism of alpha-HATB and phase evolution were detailedly investigated. Over 75% of W-Zr(Y)O-2 powders particles are less than 3 mu m. The determined S-w values (5.7), coefficient of uniformity C-u (2.3) of the W-0.5% Zr(Y)O-2 doped tungsten are 5.7 and 2.3, respectively, both indicating the narrower size distribution. The average size of Zr(Y)O-2 particles in prepared W alloy are about 250 nm under SEM observation. Through milling of these powders, the particles in W-0.5%Zr(Y)O-2 alloy and 92.25W-4.9Ni-2.1Fe-0.75ZrO(2) can further decrease to less than 100 nm in size, which are 8-10 times smaller than those in the state-of-the-art review. (C) 2020 Elsevier B.V. All rights reserved.
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