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The Effect of cBN Additions on Densification, Microstructure and Properties of WCCo Composites by Pulse Electric Current Sintering

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Cubic boron nitride/Tungsten carbide‐cobalt (cBN/WCCo) composites were fabricated at low temperature by pulse electric current sintering (PECS) using NiP as sintering additives to promote low temperature densification. Effect of cBN addition on the densification behavior, microstructure and mechanical properties of WCCo composites was investigated. It was found that near‐fully dense WC/Co with 0 ~ 20 vol% cBN composites could be obtained at temperatures between 1100°C and 1200°C under 50 MPa, while no phase transformation of cBN into the low‐hardness hexagonal hBN. The 20 vol% cBN/WCCo sample sintered at 1100°C under a pressure of 50 MPa for 10 min has a combination of hardness 16.5 GPa and fracture toughness K IC 13.7 MP·m1/2. The homogeneously dispersed cBN particles in the WC/Co composites promoted a slight increase of hardness, but a significant improvement of fracture toughness. The cBN particle bridging or deflection and pullout contribute to the high toughness.

Document Type: Research Article


Publication date: 2012-08-01

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