The hardness of cemented carbide die tools depends on the hardening phase content and grain size. When making cemented carbide, the particle size of the selected material powder is between 1 and 2 microns, and the purity is very high. The raw materials are compounded according to the regular composition, and alcohol or other medium is added to wet grinding in a wet ball mill to make them fully mixed and destroyed. After drying and sieving, they are added to a die tools agent such as wax or glue. The mixture is obtained by sieving. Then, the mixture is granulated and pressed, and heated to close to the melting point of the binder metal (1300-1500°C), the hardened phase and the binder metal will form a eutectic alloy. Through cooling, the hardened phase is dispersed in the grid composed of the bonding metal and closely connected with each other to form a strong whole. The hardness of cemented carbide depends on the hardened phase content and grain size, that is, the higher the hardened phase content and the finer the grains, the greater the hardness. The resistance of cemented carbide die tools is determined by the bonding metal. The higher the content of the bonding metal, the greater the bending strength.
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