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Electrodeposition of metallic tungsten coating from binary oxide molten salt on low activation steel substrate

Abstract

Tungsten is considered a promising plasma facing armor material for future fusion devices. An electrodeposited metallic tungsten coating from Na{sub 2}WO{sub 4}–WO{sub 3} binary oxide molten salt on low activation steel (LAS) substrate was investigated in this paper. Tungsten coatings were deposited under various pulsed currents conditions at 1173 K in atmosphere. Cathodic current density and pulsed duty cycle were investigated for pulsed current electrolysis. The crystal structure and microstructure of tungsten coatings were characterized by X-ray diffractometry, scanning electron microscopy, and energy X-ray dispersive analysis techniques. The results indicated that pulsed current density and duty cycle significantly influence tungsten nucleation and electro-crystallization phenomena. The average grain size of the coating becomes much larger with increasing cathodic current density, which demonstrates that appropriate high cathodic current density can accelerate the growth of grains on the surface of the substrate. The micro-hardness of tungsten coatings increases with the increasing thickness of coatings; the maximum micro-hardness is 482 HV. The prepared tungsten coatings have a smooth surface, a porosity of less than 1%, and an oxygen content of 0.024 wt%.
Authors:
Liu, Y. H.; [1]  State Nuclear Power Research Institute, Xicheng District, Beijing (China)]; Zhang, Y.C., E-mail: zycustb@163.com; [1]  Jiang, F.; Fu, B. J.; Sun, N. B. [1] 
  1. School of Materials Science and Engineering, University of Science and Technology BeiJing, Beijing (China)
Publication Date:
Nov 15, 2013
Product Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 442; Journal Issue: 1-3,Suppl.1; Conference: ICFRM-15: 15. international conference on fusion reactor materials, Charleston, SC (United States), 16-22 Oct 2011; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; CRYSTALLIZATION; CURRENT DENSITY; DEPOSITS; ELECTRODEPOSITION; GRAIN SIZE; HARDNESS; MOLTEN SALTS; OXIDES; PULSES; SCANNING ELECTRON MICROSCOPY; STEELS; SUBSTRATES; SURFACES; TUNGSTEN; X RADIATION; X-RAY DIFFRACTION
OSTI ID:
22250342
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0022-3115; CODEN: JNUMAM; Other: PII: S0022-3115(13)00597-7; TRN: NL14R8069071517
Availability:
Available from http://dx.doi.org/10.1016/j.jnucmat.2013.03.094
Submitting Site:
NLN
Size:
page(s) S585-S591
Announcement Date:
Jul 17, 2014

Citation Formats

Liu, Y. H., State Nuclear Power Research Institute, Xicheng District, Beijing (China)], Zhang, Y.C., E-mail: zycustb@163.com, Jiang, F., Fu, B. J., and Sun, N. B. Electrodeposition of metallic tungsten coating from binary oxide molten salt on low activation steel substrate. Netherlands: N. p., 2013. Web. doi:10.1016/J.JNUCMAT.2013.03.094.
Liu, Y. H., State Nuclear Power Research Institute, Xicheng District, Beijing (China)], Zhang, Y.C., E-mail: zycustb@163.com, Jiang, F., Fu, B. J., & Sun, N. B. Electrodeposition of metallic tungsten coating from binary oxide molten salt on low activation steel substrate. Netherlands. doi:10.1016/J.JNUCMAT.2013.03.094.
Liu, Y. H., State Nuclear Power Research Institute, Xicheng District, Beijing (China)], Zhang, Y.C., E-mail: zycustb@163.com, Jiang, F., Fu, B. J., and Sun, N. B. 2013. "Electrodeposition of metallic tungsten coating from binary oxide molten salt on low activation steel substrate." Netherlands. doi:10.1016/J.JNUCMAT.2013.03.094. https://www.osti.gov/servlets/purl/10.1016/J.JNUCMAT.2013.03.094.
@misc{etde_22250342,
title = {Electrodeposition of metallic tungsten coating from binary oxide molten salt on low activation steel substrate}
author = {Liu, Y. H., State Nuclear Power Research Institute, Xicheng District, Beijing (China)], Zhang, Y.C., E-mail: zycustb@163.com, Jiang, F., Fu, B. J., and Sun, N. B.}
abstractNote = {Tungsten is considered a promising plasma facing armor material for future fusion devices. An electrodeposited metallic tungsten coating from Na{sub 2}WO{sub 4}–WO{sub 3} binary oxide molten salt on low activation steel (LAS) substrate was investigated in this paper. Tungsten coatings were deposited under various pulsed currents conditions at 1173 K in atmosphere. Cathodic current density and pulsed duty cycle were investigated for pulsed current electrolysis. The crystal structure and microstructure of tungsten coatings were characterized by X-ray diffractometry, scanning electron microscopy, and energy X-ray dispersive analysis techniques. The results indicated that pulsed current density and duty cycle significantly influence tungsten nucleation and electro-crystallization phenomena. The average grain size of the coating becomes much larger with increasing cathodic current density, which demonstrates that appropriate high cathodic current density can accelerate the growth of grains on the surface of the substrate. The micro-hardness of tungsten coatings increases with the increasing thickness of coatings; the maximum micro-hardness is 482 HV. The prepared tungsten coatings have a smooth surface, a porosity of less than 1%, and an oxygen content of 0.024 wt%.}
doi = {10.1016/J.JNUCMAT.2013.03.094}
journal = {Journal of Nuclear Materials}
issue = {1-3,Suppl.1}
volume = {442}
journal type = {AC}
place = {Netherlands}
year = {2013}
month = {Nov}
}