Commonly used cemented carbides take WC as the main component, and are divided into the following categories according to whether other carbides are added:
1. Tungsten-cobalt (WC+Co) cemented carbide (YG)
It is composed of WC and Co, has high bending strength, toughness, good thermal conductivity, but poor heat resistance and wear resistance,
Mainly used for processing cast iron and non-ferrous metals. Fine-grained YG cemented carbide (such as YG3X, YG6X), when the cobalt content is the same, its hardness and wear resistance are higher than YG3, YG6, strength and toughness are slightly worse, suitable for processing hard cast iron, austenitic stainless steel , Heat-resistant alloy, hard bronze, etc.
2. Tungsten-titanium-cobalt (WC+TiC+Co) cemented carbide (YT)
As the hardness and melting point of TiC are higher than that of WC, compared with YG, its hardness, wear resistance and red hardness are increased.
The bonding temperature is high, the oxidation resistance is strong, and TiO2 will be generated at high temperature, which can reduce the bonding. But it has poor thermal conductivity and low bending strength, so it is suitable for processing tough materials such as steel.
3. Tungsten-tantalum-cobalt (WC+TaC+Co) cemented carbide (YA)
Adding TaC(NbC) on the basis of YG cemented carbide improves the hardness and strength, thermal shock resistance and wear resistance at room temperature and high temperature, and can be used for processing cast iron and stainless steel.
4. Tungsten-titanium-tantalum-cobalt (WC+TiC+TaC+Co)) cemented carbide (YW)
Adding TaC (NbC) on the basis of YT cemented carbide improves the bending strength, impact toughness, high temperature hardness, oxygen resistance and wear resistance. It can process steel, cast iron and non-ferrous metals. So it is often called general-purpose cemented carbide. At present, it is mainly used for processing difficult-to-process materials such as heat-resistant steel, high manganese steel, and stainless steel.
5. WC: molecular weight 195.86; Tungsten carbide
Properties: Chemical formula WC. Black hexagonal crystal. The density is 15.63g/cm3 (18℃). Melting point (2870±50)℃. Boiling point
6000°C. Mohs hardness is about 9. Insoluble in water, soluble in a mixture of nitric acid and hydrofluoric acid and aqua regia. Strong acid resistance. High hardness. The modulus of elasticity is large. The conductivity is 40% of metal. Chemically stable. It will not react with chlorine when the temperature is lower than 400℃. It is made by heating carbon black and tungsten powder to 1400~1500℃. It is widely used as high-speed cutting tools, kiln structure materials, jet engine parts, cermet materials, resistance heating elements, etc.
6. TiC: Molecular formula: TiC
Boiling point: 4820℃
Titanium Carbide
Titanium carbide: titanium carbide
Properties: gray-black crystals. The melting point is about 3200°C. Does not interact with hydrochloric acid. It can be made by heating bone charcoal and titanium dioxide in an electric furnace. The thermal expansion coefficient of TiC (7.4×10-6°C-1), TiC grains have five slip systems, and are ductile above 800°C; it is an important component of cemented carbide. Used as a cermet, it has the characteristics of high hardness, corrosion resistance and good thermal stability. It can also be used to make cutting tools. Used as a deoxidizer in the steel industry.
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