Abstract
The present study compares the sintering response of 90W–7Ni–3Fe alloys consolidated in a 2.45 GHz microwave furnace and a conventional furnace. The W–Ni–Fe compacts were sintered in a temperature range of 1200–1500 °C corresponding to solid-state as well as liquid phase sintering. The compacts were successfully sintered in a microwave furnace with about 80% reduction in the overall processing time. For both the heating modes, the W–Ni–Fe alloys exhibited significant densification prior to melt formation through solid-state sintering. The in situ dilatometric studies revealed that the contribution to densification from solid-state sintering is higher at lower heating rates. In comparison to conventional sintering, microwave sintered compacts showed relatively refined microstructure and higher hardness and flexural strength.
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