Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1621563 | Journal of Alloys and Compounds | 2009 | 4 Pages |
Abstract
Nanosized tungsten carbide–cobalt composite powder was synthesized by a thermal plasma process, in which ammonium paratungstate (APT) and cobalt oxide were reacted with a gas mixture containing CH4, H2, and Ar. The reduction and carburization of vaporized precursors produced nanosized tungsten carbide (WC1−x)–cobalt composite powder, which contained small amounts of W2C and/or W phase.The particle size of synthesized tungsten carbide powder was less than 20 nm. The synthesized composite powders were also subjected to a hydrogen heat treatment to fully carburize WC1−x, W2C, and W phases to the WC phase as well as to remove excess carbon in the product. Finally nanosized WC–Co composite powder of particle size less than 100 nm was obtained.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Taegong Ryu, H.Y. Sohn, Kyu Sup Hwang, Zhigang Z. Fang,