Sintering of nanophase WC–15vol.%Co hard metals by rapid sintering process
Source abstract
Abstract
Abstract A sintering method for the rapid sintering of a nanostructured hard metals in short time is introduced with a focus on the manufacturing potential of this novel high-frequency induction heated sintering (HFIHS) process. The advantage of this process allows very quick densification to near theoretical density and prohibition of grain growth in nanostructured materials. In this work, we developed a new process of sintering for nanostructured WC–15vol.%Co hard metals. A highly dense WC–15vol.%Co with a relative density of up to 99.4% was produced with simultaneous application of 60 MPa pressure and induced current within 1 min. The average grain size was about 258 nm and mean free path was about 11.6 nm. The fracture toughness and hardness values obtained were 11.9 MPa m1/2 and 1992 HV30, respectively. Also, we produced dense WC–Co hard metals with a relative density of 97% without applying pressure.
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