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  Investigations of the nickel promotional effect on the reduction and sintering of tungsten compounds

Yin, Q., Lai, C., Chen, S., Peng, J., Li, H., Zhou, W., et al. (2019). Investigations of the nickel promotional effect on the reduction and sintering of tungsten compounds. International Journal of Refractory Metals and Hard Materials, 78, 296-302. doi:10.1016/j.ijrmhm.2018.10.008.

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 Creators:
Yin, Qiao1, Author              
Lai, Chen1, Author              
Chen, Shuqun1, Author              
Peng, Jian2, Author              
Li, Hongyi1, Author              
Zhou, Wenyuan1, Author              
Hu, Peng1, Author              
Wang, Jinshu1, Author              
Affiliations:
1College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, PR China, ou_persistent22              
2Intermetallic Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863400              

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Free keywords: Binary alloys; Calcination; Calculations; Hydrogen; Oxygen vacancies; Powders; Scanning electron microscopy; Sintering; Transmission electron microscopy; X ray photoelectron spectroscopy; X ray powder diffraction, Calcination and hydrogen reductions; First-principles calculation; Hydrogen atmosphere; Interplanar spacings; Promotional effect; Reduction behavior; Temperature programmed reduction analysis; Thin metallic coatings, Tungsten compounds
 Abstract: In this article, Ni-coated W powders were firstly prepared by a liquid-solid doping method combined with air calcination and hydrogen reduction. X-ray diffraction analysis, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy and temperature programmed reduction analysis were carried out to investigate the nickel doping process in WO 3 and its influence on the reduction behaviors of tungsten oxides. It reveals that after calcinations most Ni ions would occupy the lattice sites of host W ions and decrease the interplanar spacing of WO 3 . The latter is due to the promotion of oxygen vacancy generation within WO 3 rather than the changes in ionic radius. After hydrogen reduction, the doped Ni atoms precipitate onto the surface of W particles as thin metallic coatings, whereby the size and morphology of reduced W particles are varied greatly with increasing Ni addition. The presence of Ni has also been found to lower the reduction barriers for WO 3 by using first-principles calculation. Finally, W-Ni compacts were sintered at 1500 °C in hydrogen atmosphere and the accelerated densification phenomenon of W alloy upon Ni doping is discussed. © 2018 Elsevier Ltd

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Language(s): eng - English
 Dates: 2019-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.ijrmhm.2018.10.008
 Degree: -

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Title: International Journal of Refractory Metals and Hard Materials
  Other : Int. J. Refract. Met. Hard Mat.
Source Genre: Journal
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Publ. Info: Shrewsbury, England : Elsevier B.V.
Pages: - Volume / Issue: 78 Sequence Number: - Start / End Page: 296 - 302 Identifier: ISSN: 0263-4368
CoNE: https://pure.mpg.de/cone/journals/resource/954926234431