Abstract
The microstructure, hardness and adhesive strength of titanium carbide (TiC) layer coated on WC-10mass%Co alloy were studied as a function of carbon content of the alloy substrate.
The W and C atoms in the substrate were apt to diffuse into TiC layer during CVD, as the carbon content of substrate increased. This resulted in the formation of network structure of TiC-WC solid solution (β-phase) inside the layer near the interface, and also in the formation of thin cobalt layer and micro-pores inside the substrate near the interface. It was clearly shown that the hardness and adhesive strength of TiC layer were varied according to the carbon content of the substrate.
