Abstract
The binderless WC cemented carbide was synthesized with multi-scale and multi-morphology toughening strategy by Spark Plasma Sintering. The influence of sintering temperature on the mechanical properties of WC-cBN-SiCw was investigated. The result showed that the Vickers hardness and fracture toughness initially increase and then decrease with the increase of sintering temperature. As the sintering temperature reaches 1300℃, the best Vickers hardness and fracture toughness can be obtained, 12.8 GPa and 10.6 MPa.m1/2 respectively. The toughening mechanism can be attributed to the strong and weak mixed interface characteristic constructed by micro and nano particles, which induce crack deflection and crack bridging. Meanwhile, the adhesion of nanoparticles on SiC whisker enhances the resistance of whisker pull out, which promotes the consumption of fracture energy.
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