Abstract
The transverse-rupture strength of TiC-Mo2C-Ni cermets free from large residual pores was studied at room temperature and at 1000°C as a function of their domain (grain) size of the binder phase.It was found that the effect of the binder domain size of cermets on the strength was similar to that of WC-Co cemented carbides, that is, the strength decreased with increasing domain size at room temperature, whereas at 1000°C it increased. However, it was demonstrated that in the case of cermets, the effect was not so marked; the dependence of the size of fracture source on the binder domain size was rather slight. The fracture of cermets was not always initiated from the domain boundaries of the binder in contrast to the case of cemented carbide.
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