Plasmochemical synthesis of the W–Y2O3 composition nanopowders using thermal plasma of electric-arc discharge
Object. The results of experimental studies of nanopowders synthesis for the W-Y2O3 system using plasmachemical synthesis are presented. The main task was to obtain W-Y2O3 nanopowders composition with homogeneous distribution of yttrium oxide. Methods. Investigation of producing process for the nanopowders composition were carried out at the experimental setup developed by IMET RAS (RU Patent 2311225) when mixture of initial precursors (tungsten trioxide and yttrium acetate) interacts with nitrogen-hydrogen plasma generated in electric arc plasmatron with up to 30 kW power. Results. Distribution homogeneity in the composition was observed using element microanalysis (EDX) for different specified concentrations of yttrium oxide (0.3, 1.2, 5.0 wt%) at the stage of precursors mixture preparing and for synthesized nanopowders composition - the calculated content of yttrium oxide in the composition corresponds to 0.3, 1.3, 4.5 wt% for the mixture of initial materials and 0.6, 1.0, 3.8 wt% for the obtained nanopowders composition, respectively. Gas content analysis showed that the carbon content does not exceed 0.03-0.04 wt%, and the oxygen content is 2.2-2.6, 1.7-2.0, 3.5-5.0 wt% for W-Y2O3 composition with specified concentration of yttrium oxide 0.3, 1.2 and 5.0 wt%, respectively. Nitrogen content in the nanopowders compositions and tungsten nanopowder (0.1-0.2 wt%) corresponds to physical adsorption on nanoparticle surface. It is noted that the content of 1.2 wt% yttrium oxide in the composition gives the powder resistance to oxidation compared to pure tungsten nanopowder - the oxygen content for W-Y2O3 (1.2%) corresponds to [O] = 1.7-2.0% (taking into account the oxygen content in yttrium oxide [O] Y2O3 = 0.26%), and in tungsten nanopowder - [O] = 2.2-2.4%. SEM and TEM micrographs show that composition nanoparticles have characteristic size 20-200 nm. Using EDX microanalysis, it was found that Y2O3 homogeneous distribution over the surface of all tungsten nanoparticles is achieved. X-ray phase analysis showed that in the W-Y2O3 nanopowder composition there are W-phase and W3O traces, Y2O3 presence is hardly noticeable. When compared with tungsten nanoparticles, insignificant change in the lattice parameter (a) from 3.166 to 3.167 A, and increase in crystallite size (CSR) from 32 to 36-38 nm noted for the composition. Conclusions. Formation patterns for W-Y2O3 nanopowders composite with content of yttrium oxide in the range from 0.3 to 5.0 wt% are established; parameters and conditions of plasmachemical synthesis are determined, at which complete conversion of initial reagents into target products with uniform distribution of yttrium oxide in synthesized nanopowders is achieved. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.
Keywords
plasmochemical synthesis,
nanopowders,
thermal plasma,
tungsten,
yttrium oxideAuthors
| Samokhin Andrey V. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | asamokhin@imet.ac.ru |
| Alexeev Nikolay V. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | nvalexeev@yandex.ru |
| Sinayskiy Mikhail A. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | ms18@mail.ru |
| Fadeev Andrey A. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | afadeev@imet.ac.ru |
| Dorofeev Alexey A. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | adorofeev@imet.ac.ru |
| Kalashnikov Yulian P. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | ulian1996@inbox.ru |
| Terentev Alexander V. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | aterentev@imet.ac.ru |
| Andreeva Nadezhda A. | A.A. Baikov Institute of metallurgy and material science of Russian Academy of Science | nandreeva@imet.ac.ru |
Всего: 8
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