Properties and rapid consolidation of nanostructured WC and WC-10 vol.%TiAl3 hard materials by the high frequency induction heating
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In the case of cemented WC, Ni or Co is added as a binder for the formation of composite structures. However, the high costand the low hardness of Ni or Co, and the low corrosion resistance of the WC-Ni and WC-Co cermets have generated interestin recent years for alternative binder phases. In this study, TiAl3 was used as a novel binder and consolidated by the highfrequency induction heated sintering (HFIHS) method. The method was found to enable not only the rapid densification butalso the inhibition of grain growth preserving the nano-scale microstructure. Highly dense WC and WC-TiAl3 with a relativedensity of up to 99% was obtained within one min by HFIHS under a pressure of 80 MPa. The addition of TiAl3 to WCenhanced the toughness without great decrease of hardness due to crack deflection and nanostructured phase.
Abstract
In the case of cemented WC, Ni or Co is added as a binder for the formation of composite structures. However, the high costand the low hardness of Ni or Co, and the low corrosion resistance of the WC-Ni and WC-Co cermets have generated interestin recent years for alternative binder phases. In this study, TiAl3 was used as a novel binder and consolidated by the highfrequency induction heated sintering (HFIHS) method. The method was found to enable not only the rapid densification butalso the inhibition of grain growth preserving the nano-scale microstructure. Highly dense WC and WC-TiAl3 with a relativedensity of up to 99% was obtained within one min by HFIHS under a pressure of 80 MPa. The addition of TiAl3 to WCenhanced the toughness without great decrease of hardness due to crack deflection and nanostructured phase.
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