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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.8 (2001)  >  pp.1575-1581

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.8 (2001)   pp.1575 - 1581 Next article>>

Synthesis of Nano-Sized WC-Co Powders by Reduction-Carburization Process

Gwan-Hyoung Lee1) and Shinhoo Kang1)
1) School of Materials Science and Engineering, Seoul National University

The feasibility of producing nano-sized WC and WC-Co powders by reduction and carburization of WO3 and Co3O4 under hydrogen and methane atmospheres was evaluated. WC powders of 1 \micron in particle size were obtained from WO3 on reduction and carburization at 950°C. On the other hand, nano-sized WC-Co powders with a particle size of ∼ 100 nm could be produced by a two-step reduction process, using a blend of WO3 and Co3O4. Critical control parameters in this process, such as the gas flow rate, temperature and treatment time, were found.


Keyword:
tungsten carbide, cemented carbide, nanomaterials, reduction, carburization

Received: February 26, 2001
Accepted: June 29, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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