Abstract
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.
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