Consolidation of advanced WC–Co powders
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WC-Co powders were consolidated using a new method of extrusion. The consolidation process included two equal channel angular extrusions through a 90° die at temperatures of 300 °C, 1100 °C or 1200 °C on composite billets containing different WC-Co powder blends. The composition investigated was WC-14%Co with particle sizes ranging from 0.2 to 0.8 μm. The as-received powders and consolidated-annealed materials are characterized for structure, particle and grain size, impurity content, void fraction, composition and hardness. Full compaction is achieved after two extrusions at 1200 °C and subsequent annealing in argon at 1400 °C. The results compare favorably with results on commercially consolidated materials. The findings show that angular extrusion combined with post extrusion annealing can be used to successfully consolidate WC-Co powders into hard and strong cemented carbides of interest to the cutting tool and oil field industries.
author list (cited authors)
Parasiris, A., & Hartwig, K. T.