Diamond coated tools have excellent mechanical properties.

Natural diamond tools are mainly used for Ultra-precision mirror processing of copper, copper alloy, gold, silver, rhodium and other precious non-ferrous metals, as well as special parts, such as camera disk, optical plane mirror, multi-mirror and quadric mirror. But its crystalline anisotropy is very expensive.

The performance of PCD depends on the diamond grain and cobalt content, and the tool life is 10-500 times longer than that of cemented carbide (WC) cutters. Mainly used for turning a variety of non-ferrous metals such as aluminum, copper, magnesium and its alloys, cemented carbide and wear-resistant fiber plasticizing materials, metal matrix composites, wood and other non-metallic materials. The cutting speed, feed speed and cutting depth depend on the material and hardness of the workpiece. The properties and applications of Artificial Polycrystalline Diamond (PDC) are similar to those of PCD tools. It is mainly used in cutting non-ferrous metals, cemented carbides, ceramics, non-metallic materials (plastics, hard rubber, carbon rods, wood, cement products, etc.) and composites, gradually replacing cemented carbide tools.

Because there are some residual bonded metals and graphite between diamond particles, the wear resistance and life of the cutting tools will be reduced if the bonded metals are distributed as coalescence or veins. In addition, the residual metal of solvent metal exists directly, and the solvent metal contacts directly with diamond surface. Reduce the (PDC) oxidation resistance and cutter heat resistance, so the cutting performance of the tool is not stable. The preparation process of diamond thick film cutting tools is complicated because of the high interfacial energy between diamond and low melting point metals and their alloys. Diamond is difficult to be infiltrated by ordinary low melting point solder alloys. Because of the poor weldability, it is difficult to make complex geometric shapes of cutting tools, so TDF welding tools can not be used in high-speed milling.

The reason why diamond coated tools can be used in high speed machining is that in addition to the excellent mechanical properties of diamond coated tools, diamond coated tools can be used to produce milling cutters of arbitrary complex shapes for high speed machining such as Al-Ti alloy aerospace materials and refractory non-metallic materials such as graphite electrodes.