performance of cutting tool materials - metal-ceramic

Cermet (Cermet), also known as titanium-based alloy (also called it as "porcelain gold", "Tao Jin," etc.), it has excellent mechanical properties and high temperature performance, as its name implies it, has both ceramic (Ceramics) materials with high hardness, but dry polishing pads  also has a metal (Metal) material strength and toughness, and the price is relatively cheap. For a long time, cermet cutting tool materials applications as far as widespread as other similar carbide. In recent years, metal ceramic tool materials development and application of gradually be taken seriously, also expanded its scope of application. 2 Performance analysis and comparison of cermet
Cermet sintered material with other commonly used - carbide and ceramic, the main chemical composition, temperature performance, and other mechanical and physical properties.
Cermet have the following performance characteristics.
High hardness and high temperature hardness
Tool flank wear mainly by friction between the tool and the workpiece caused by the relative motion, and the tool is directly related to the hardness and high-temperature hardness. Metal ceramic blade, high hardness, good red hardness, so then flank wear better. High hardness but also improve the wear resistance of the tool rake face an important factor.
High surface free energy of the low
Materials, surface free energy and its enthalpy, surface tension, and so on, is the characterization of surface properties of materials based on indicators, which can characterize the  sds drill bits material surface chemical stability under high temperature conditions, the surface free energy of the negative material, the greater the more stable chemical properties. Surface free energy value is calculated as DG DG = nu ∫ w dE dr
2 l0 dr
Where: E - interatomic potential
l0 - stable union state atomic spacing
nu - material damage cracking unit area required to pull a combination of atoms
r - the distance between atoms
Cutting steel, the tool flank wear in front of the main form of crater wear, the wear rate of the tool material chemical stability under high temperature, molten material into the tool material in the iron solubility of other closely related. As cermet surface free energy, into the molten iron solubility and diffusion reaction between materials is lower than cemented carbide, cermet tool rake face so crater wear resistance than the diamond discs  ability carbide.
The lower surface free energy (DG negative large), better chemical stability, materials and the stronger the antioxidant capacity. Tool wear occurs mainly in the boundary depth of cut at the boundary in contact with air, where the oxidation-shaped groove is formed easily intense wear. Cermet superior antioxidant properties of carbide. Figure 3 shows the NX33 P10 carbide cermet tools and the tool to cut the workpiece under the same processing conditions due to differences in tool boundary wear surface quality differences. The figure shows the boundary cermet tool wear, good surface quality; boundary carbide tool wear and poor surface quality.