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Direct Synthesis of Tungsten Carbide Nanoparticles by Mechanically Assisted Carbothermic Reduction of Natural Wolframite
Author(s) -
Temuujin Jadambaa,
Senna Mamoru,
Jadambaa Tsedev,
Byambasuren Dondog
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00157.x
Subject(s) - wolframite , materials science , tungsten carbide , tungsten , calcination , carbide , nanoparticle , metallurgy , chemical engineering , carbon fibers , particle size , carbothermic reaction , nanotechnology , composite material , chemistry , composite number , catalysis , biochemistry , engineering
Carbothermic reduction of natural wolframite (FeWO 4 ) to nano‐sized tungsten carbide (WC) particles was achieved by calcining mechanically activated mixtures of FeWO 4 and active carbon at 1100°C under flowing Ar gas. The average particle size ranged between 20 and 25 nm. Intermediates, Fe 6 W 6 C and Fe 3 W 3 C, were observed between 900° and 1100°C, which decomposed to give the final product, WC. Homogeneity increase and associated decrease in the diffusion path by milling are mainly responsible for the successful production of WC. The process paves the way to rational utilization of natural FeWO 4 directly to fine advanced materials.