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Ultra‐Fine Tungsten Carbide Powder Prepared by a Nitridation–Carburization Method
Author(s) -
Sun ShiKuan,
Kan YanMei,
Zhang GuoJun,
Wang PeiLing
Publication year - 2010
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.1551-2916.2010.04091.x
Subject(s) - tungsten carbide , materials science , carbide , metallurgy , tungsten , particle size , chemical engineering , metal , particle (ecology) , specific surface area , tungsten trioxide , catalysis , chemistry , organic chemistry , oceanography , engineering , geology
WC powder was synthesized by a nitridation–carburization method with WO 3 prepared by the citrate sol–gel route as the starting material, and the reaction mechanism was investigated. It was found that WO 3 was converted to nanosized W 2 N after the nitridation process in NH 3 . Then, the W 2 N was transformed to W metal, W 2 C, and WC in sequence when it was carburized in CH 4 –H 2 gas mixture. The WC powder obtained possessed a high specific surface area of 24.6 m 2 /g, and showed a particle size of 20–30 nm, which was much finer than the WC powder prepared by direct carburization of WO 3 in CH 4 –H 2 gas mixture. The reason was also discussed.