Mechanical and Physical Properties of the Extruded TiC-Ni Cermets

Abstract

Various compositions of TiC-Ni cermets were extruded at high temperature through graphite dies, by viscous flow of liquid phase. The distributions of transverse rupture strength, hardness, and density along extrusion direction, and the distributions of hardness on the cross sections were investigated.
Extrusion-pressure/punch-travel diagrams were recorded, and the flow of the materials and the surface defects were discussed.
The most competent composition of TiC-Ni for the present method is about 50%-Ni and balancing TiC. The 50%-Ni rod has uniform property over the whole length except the top of the rod, and the density is good agreement with the theoretical value. The 40%-Ni and lower nickel composite rods have some concentration gradients along extrusion direction, and the surface defects like so-called “fir-tree” were occurred in end-part of the rod.