Abstract
A novel nanostructured cemented carbide formed from WC-5%Co-20%Ni-based brazing alloy is described. During sintering, the Ni-brazing alloy is infiltrated into a green compact of WC-5%Co at 1050–1100°C for 2–60min. Perfect wetting behavior and a zero contact angle are achieved after only 40 s. Relative densities of 98.5% and 100% and microhardness values of above 1500HV1 and 1800HV1 are obtained after 2 and 30min, respectively. A change in mean particle size of 550–650nm in the precursor to a bimodal distribution of 350–400nm and 10–20nm is explained by a solution/reprecipitation mechanism.
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