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- Title
Nanograined WC-Co Composite Powders by Chemical Vapor Synthesis.
- Authors
Taegong Ryu; Sohn, H. Y.; Gilsoo Han; Young-Ugk Kim; Kyu Sup Hwang; Mena, M.; Fang, Zhigang Z.
- Abstract
Nanograined tungsten carbide (WC)–Co composite powders were prepared by a chemical vapor synthesis (CVS) process that has previously been used for preparing the aluminides of titanium and nickel and other metallic and intermetallic powders at the University of Utah. To determine the optimum condition for producing nanograined WC-Co composite powders, the effects of carburization temperature, CH4 to WCl6 ratio, CH4 to H2 ratio, CoCl2 contents, and residence time of WC on the powder composition and particle size were investigated. The reduction and carburization of the vaporized chlorides by CH4-H2 mixtures produced nanograined WC and Co composite powder, which sometimes contained small levels of W2C, W, or the η (Co3W3C) phase. The presence of these incompletely carburized phases can be tolerated because they can be fully carburized during the subsequent sintering process. These phases can also be fully carburized by a separate post-treatment. The products were characterized by using X-ray diffraction (XRD) and a transmission electron microscope (TEM). As a result, nanograined WC-Co composite with the particle size less than 30 nm was obtained.
- Subjects
TUNGSTEN alloys; CARBIDES; TITANIUM; NICKEL; CHLORIDES; PARTICLES (Nuclear physics); ELECTRON microscopes; PARTICLES; CRYSTALS
- Publication
Metallurgical & Materials Transactions. Part B, 2008, Vol 39, Issue 1, p1
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-007-9115-5