Sinterability of Cemented Carbides Containing Aluminum in Binder Phase

Abstract

The densification behaviour and high temperature oxidation resistance of WC-Fe-Al, WC-Co-Al and WC-Ni-Al allloys were studied.
WC-Co-Al alloy has poor sinterability. WC-11.2mass%Ni-0.7mass%Al alloy was densified perfectly and has transvers-rupture strength of 2.1 GPa, but has hardness of HRA 89.8, which is less than that of WC-8.6mass%Fe-1.4mass%Al alloy.
The weight gain of WC-12.8mass%Fe-0.7mass%Al alloy heated in air at 1073K was same as that of WC-8.6mass%Fe-1.4mass%Al alloy and about a half of that of WC-12.8mass%Co alloy.