The Kinetics of Incongruent Reduction of Tungsten Carbide via Reaction with a Hafnium-Copper Melt
The reduction of WC into W by reaction with a Hf-Cu melt has been found to proceed by the formation of layers of W and HfC. The extent of such incongruent WC reduction has been examined after the immersion of dense, polycrystalline WC plates in a vertical orientation in Hf-Cu melts at 1150-1300 °C for 1-24 h. A W layer of uniform thickness formed adjacent to the WC, whereas an irregular, but generally continuous HfC layer formed adjacent to the W layer. The rate of WC reaction was evaluated by measuring the thickness of the W layer as a function of reaction time, temperature and vertical position along the WC surface. Such kinetic data and microstructural analyses indicated that the incongruent reduction of WC in molten Hf-Cu is likely to be controlled by the diffusion of carbon through the W and/or HfC layers.
Y. Liu et al., "The Kinetics of Incongruent Reduction of Tungsten Carbide via Reaction with a Hafnium-Copper Melt," Acta Materialia, vol. 57, no. 13, pp. 3924 - 3931, Acta Materialia Inc., Aug 2009.
The definitive version is available at https://doi.org/10.1016/j.actamat.2009.04.052
Materials Science and Engineering
Keywords and Phrases
Hf-Cu liquid; Incongruent reduction; Reaction kinetics; Tungsten carbide
International Standard Serial Number (ISSN)
Article - Journal
© 2009 Acta Materialia Inc., All rights reserved.
01 Aug 2009
This work was supported by the Air Force Office of Scientific Research (Grant No. FA9550-07-1-0115; Dr. Joan Fuller, Program Manager).