WC PLATELET-CONTAINING HARDMETALS

摘要

Since Toshiba Tungaloy introduced their Disk Reinforced Cemented Carbide to the scientific community, WC platelet-containing hardmetals have been a topic of major interest. The present work provides a literature review on the formation and growth of the trigonal-shaped WC platelets. The review establishes two main mechanisms of plate formation. Based on this knowledge a new processing route has been elaborated at Vienna to obtain WC plate-containing hardmetals. This route is based on the recrystallization of very-fine grained WC in the presence of small amounts of TiC or Ti(C,N) [0.2-0.7 wt% TiC.N]. Alloys based on this processing method show a high degree of plate formation with aspect ratios of up to 1:10, as well as promising hardness/ toughness combinations compared with conventional, plate-free materials.