Formation of diffusion titanium coatings from liquid metal media solutions on hard alloys WC-Co and TiC-WC-Co

Abstract

The technology of diffusion titanium coating from the liquid metal media to the carbide-tipped tolls 15%Ti-WC-6%Co and WC-8%Co have described. The thickness of the coating varies depending on the temperature and holding time of diffusion saturation, and ranges from 2,6 to 5,6 μm on alloys of the 15%Ti-WC-6%Co type, from 2 to 5,4 microns on WC-8%Co alloys. It is revealed, that the elemental composition depended of composition of hard alloy. The microhardness of coating on hard alloy 15%Ti-WC-6%Co is 30000 MPa, and for hard alloy WC-8%Co is 24750 MPa. The high microhardness of the coating is provides by its formation on the basis of titanium carbide TiC. It was found that the elemental composition of the coating depends of the composition of the hard alloy to which it is applied. It was found that the surface layers consist of titanium carbide TiC, α-Ti like bind, intermatallide Ti2Co for 15%Ti-WC-6%Co alloy. The WC-8%Co alloy also include tungsten carbide WC.