Synthesis, densification and characterization of ultra-fine W-Al2O3 composite powder
- Henan Key Laboratory of High-temperature Structural and Functional Materials, Non-ferrous metal generic technology collaborative innovation center, Henan University of Science and Technology, Luoyang, Henan 471023 (China)
- Henan Province Industrial Technology Research Institute of Resource and Materials, Zhengzhou University, Henan 450001 (China)
Highlights: • W-Al{sub 2}O{sub 3} ultrafine powder was prepared by hydrothermal synthesis. • Al{sub 2}(WO{sub 4}){sub 3} was a key process for forming nano-Al{sub 2}O{sub 3} coated W structure. • This coated structure inhibited the further growth of W particles. • Dispersed Al{sub 2}O{sub 3} particles improved obviously mechanical properties of W alloy. • Fracture mode changed into intergranular from transcrystalline with Al{sub 2}O{sub 3} addition. - Abstract: W-Al{sub 2}O{sub 3} composite powder was prepared via hydrothermal synthesis containing doping, annealing and reduction. The precursors WO{sub 3} and AlOOH were synthesized by the two sets of the hydrothermal reactions, respectively. The formation of Al{sub 2}(WO{sub 4}){sub 3} from these two precursors in an aqueous solution is a key process, which is beneficial to improve the mixing uniformity of final powder to a molecular level. During subsequent reduction, nano-Al{sub 2}O{sub 3} coated W particles were obtained, and inhibited the further deposition of reduced W atoms on the adjacent W particles, obtaining ultra-fine Al{sub 2}O{sub 3}/W composite powder. After sintering, the dense and fine-grained W-Al{sub 2}O{sub 3} alloy was obtained due to the high sintering activity of ultra-fine powder. Compared with the pure tungsten, the W-Al{sub 2}O{sub 3} alloy displays obvious higher values of both strength and plasticity especially when the Al{sub 2}O{sub 3} content is 2 wt%.
- OSTI ID:
- 22805083
- Journal Information:
- Materials Characterization, Vol. 142; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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