Group growth of polycrystalline diamond coating by MPCVD technique on a hard alloy tool with a thin blade

Abstract A coating technology for application of hardening of diamond coatings on carbide tools for treatment of mineral fiberglass based on quartz texture with chromate-phosphate cohesive (FQTCC) is proposed. The purpose of this development is to increase the edge strength of the tool. The use of the technology described above allowed, in comparison with the cutter without diamond coating, to increase the productivity of processing by 11.5 times, by cutting speed by 2.3 times, and by the minute supply by 5.0 times. The approach is based on changing the configuration of the microwave field when applying a diamond coating on hard alloy substrates in the microwave plasma of the ARDIS-100 reactor by using specially designed plateholders. This method allows for the group coating on several substrates in a single process. A simplified mathematical model for calculating the temperature of the top of the cutter during the growth of a CVD diamond film, taking into account heat transfer through thermal conductivity and radiation, has been constructed. Temperature distribution on the surface of a tungsten carbide cutter in the temperature range optimal for diamond growth was constructed. The difference between the average (experimental) and maximum (calculated) temperature in such a cutter was from 80 to 138°C.