Enhanced mechanical properties of nanostructured (W,Ti)C-FeAl hard materials rapidly sintered by the pulsed current activated heating
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In the case of cemented (W,Ti)C, Co or Ni is added as a binder for the formation of composite structures. However, the highcost of Co or Ni, the low hardness and the low corrosion resistance of the (W,Ti)C-Ni and (W,Ti)C-Co cermets have generatedinterest in recent years for alternative binder phases. In this study, FeAl was used as a novel binder and consolidated by thepulsed current activated sintering (PCAS) method. The advantage of this process is not only rapid densification to neartheoretical density but also the prohibition of grain growth in nano-structured materials. Highly dense (W,Ti)C-FeAl with arelative density of up to 99% was obtained within 3 minutes by PCAS under a pressure of 80 MPa. The addition of FeAl to(W,Ti)C enhanced the toughness without great decrease of hardness due to crack deflection and decrease of grain size.
Abstract
In the case of cemented (W,Ti)C, Co or Ni is added as a binder for the formation of composite structures. However, the highcost of Co or Ni, the low hardness and the low corrosion resistance of the (W,Ti)C-Ni and (W,Ti)C-Co cermets have generatedinterest in recent years for alternative binder phases. In this study, FeAl was used as a novel binder and consolidated by thepulsed current activated sintering (PCAS) method. The advantage of this process is not only rapid densification to neartheoretical density but also the prohibition of grain growth in nano-structured materials. Highly dense (W,Ti)C-FeAl with arelative density of up to 99% was obtained within 3 minutes by PCAS under a pressure of 80 MPa. The addition of FeAl to(W,Ti)C enhanced the toughness without great decrease of hardness due to crack deflection and decrease of grain size.
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