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Title: A study of tungsten nanopowder formation by self-propagating high-temperature synthesis

Molten salt-assisted self-propagating high-temperature synthesis of nanocrystalline W powder was studied experimentally. The technique involves the reduction of WO{sub 3} in the presence of sodium chloride using three different reducing agents: magnesium (Mg), sodium azide (NaN{sub 3}), and sodium borohydride (NaBH{sub 4}). The effects of the mole fraction of sodium chloride on temperature distributions, combustion parameters, phase compositions, and morphology of the final products were determined. The sodium chloride-assisted method reported here has been found to be effective for lowering combustion temperature and producing uniform and spherical W nanopowders of average particle size around 20-200, 100-200, and 20-50 nm. The effect of combustion temperature on tungsten particle size is discussed, and a sketch describing the chemistry of combustion is proposed.
Authors:
;  [1] ;  [2]
  1. Rapidly Solidified Materials Research Center, Chungnam National University, 220 Gung-Dong, Yuseong, Daejeon 305-764 (Korea, Republic of)
  2. Korea Atomic Energy Research Institute (KAERI), 150 Duckjin-Dong, Yuseong, Daejeon 305-353 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20677688
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 142; Journal Issue: 3; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TUNGSTEN; POWDERS; NANOSTRUCTURES; SYNTHESIS; REDUCTION; TUNGSTEN OXIDES; TEMPERATURE DISTRIBUTION; PHASE DIAGRAMS; TEMPERATURE DEPENDENCE; MORPHOLOGY; SODIUM CHLORIDES