Tungsten carbide is sintered from tungsten carbide powder (WC), cobalt powder as binder metal, and TiC and TaC powder. Different composition ratios correspond to different grades.
(1) Tungsten-Cobalt (WC+Co) Cemented Carbide (YG) It is composed of WC and Co. It has high flexural strength and toughness, good thermal conductivity, but poor heat resistance and wear resistance. For machining cast iron and non-ferrous metals. Fine-grained YG-type cemented carbides (such as YG3X, YG6X) have higher hardness and wear resistance than YG3 and YG6 when the cobalt content is the same, and their strength and toughness are slightly worse. They are suitable for machining hard cast iron and austenitic stainless steel. , heat-resistant alloy, hard bronze, etc.
(2) Tungsten-titanium-cobalt (WC+TiC+Co) cemented carbide (YT) Since the hardness and melting point of TiC are higher than WC, its hardness, wear resistance, and red hardness are increased compared with YG, and the viscosity The junction temperature is high, the oxidation resistance is strong, and TiO 2 is formed at high temperature, which can reduce the adhesion. However, it has poor thermal conductivity and low flexural strength, so it is suitable for processing tough materials such as steel.
(3) Tungsten-tantalum-cobalt (WC+TaC+Co) cemented carbide (YA) TaC (NbC) is added on the basis of YG cemented carbide, which improves the hardness and strength, thermal shock resistance and resistance at room temperature and high temperature. Abrasive, can be used for machining cast iron and stainless steel.
(4) Tungsten-titanium-tantalum-cobalt (WC+TiC+TaC+Co)) cemented carbide (YW) TaC (NbC) is added on the basis of YT cemented carbide, which improves the bending strength, impact toughness and high temperature hardness , antioxidant capacity and wear resistance. It can process both steel, cast iron and non-ferrous metals.