Influence of diffusion metallization to hard alloys of WC-TiC-Co and WC-Co with functional TiC coating by Ni-Cu

Abstract

Diffusion alloying effect of WC-8%Co and 15%TiC-WC-6%Co hard alloys by Ni-Cu over TiC deposited by diffusion alloying in a low-melting liquid metal medium melt has presented. Such operation abilities of cutting tool as toll life, wear resistance, quality of processed surface can be increase by diffusion alloying in liquid metal melts. Tool life increased by 2.5 times compared to uncoated tools. It was found that kinetic of coating formation depends of the temperature and alloying time. The thickness of the diffusion layer varied up 8 to 27 microns on WC-8%Co; up 9 to 29 microns for 15%TiC-WC-6%Co alloys. The maximum microhardness on 15%TiC-WC-6%Co alloys was 21500 MPa, for WC-8%Co alloys 18000 MPa. It was found that element-phase composition of hard alloy influence to kinetic of diffusion functional coating formation process. Functional diffusion layer on 15%TiC-WC-6%Co alloys have a higher hardness and thickness compared to WC-8%Co.