MPACVD plasma chemical synthesis of polycrystalline diamond coating on the working surface of carbide cutting tools in the microwave plasma torch discharge
The paper studies the possibility of applying the CVD method of plasma chemical synthesis of polycrystalline diamond films in plasma of the microwave torch discharge under atmospheric pressure to cover the working surface of carbide cutting tools to increase their durability. Cutting tool of polycrystalline diamond is used primarily in machine tool, automotive and agricultural machinery, aircraft for turning non-ferrous metals, titanium, abrasive aluminum alloys, ceramic and composite materials. The best way to increase the strength and wear resistance of cemented carbide cutting tools is that the surface of the cemented carbide or PDC cutting inserts should be covered with monolithic polycrystalline CVD-diamond layer. Direct coating of polycrystalline diamond layer on the surface of the cutters with a good adhesion prevents the presence of cobalt in cemented carbide tools. The choice of the best material and technology of the insulating layer between diamond and hard alloy and subsequent deposition of the diamond coating in microwave plasma torch are treated.