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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Hydrogen Reduction of Cobalt(II,III) oxide to make sub-micron and micron size cobalt metal powder for WC-Co synthesis
Author(s) Raj Pal Singh Gaur, Thomas J Jewett, Scott A Braymiller
On-Site Speaker (Planned) Raj Pal Singh Gaur
Abstract Scope This paper pertains to the hydrogen reduction of mixed valence cobalt oxide. The reduction of Co3O4 in hydrogen was studied via a design-of-experiment approach. The effect of three parameters i.e. temperature gradient (C/min), time of reduction (h) and temperature of reduction (C) was studied on the reduction of Co3O4 to cobalt metal powders. BET particle surface areas of cobalt powders were measured and used as a response for developing experimental conditions for making different. sizes of cobalt metal powders such as sub-micron, micron and extra-fine. Both temperature gradient (C/min) and reduction temperature (C) were found as significant factors. The proposed mechanism of the reduction of Co3O4 under various experimental conditions as well as the application of cobalt metal powders containing different particle sizes (FSSS) in WC-Co powders synthesis will be presented in this paper.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Powder Materials, Process Technology


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