Tungsten carbide base hard alloy of tungsten carbide with high hardness, wear resistance and refractory. These alloys containing 85% to 95% and 5% to 14% cobalt tungsten carbide, cobalt is used as binder for metal, it makes the alloy possess the necessary strength. Mainly used for some alloy steel, it also contains titanium, tantalum and niobium carbide. All of these alloys are produced by powder metallurgical method. When it is heated to 1000 to 1100 DEG C, they still have high hardness and wear resistance. The cutting speed of carbide cutting tools is far more than the cutting speed tool steel cutting tool best. Hard alloy is mainly used for cutting tools, mining tools and dies. Tungsten carbide in high temperature above 1000 ℃ can still maintain good hardness, is the ideal tool for cutting, grinding. The tungsten powder (or W03) and carbon black mixtures in hydrogen gas or vacuum at a certain temperature carbonization, which is made of tungsten carbide (WC), then WC and metal binder cobalt according to a certain proportion, after milling, molding, sintering process, tool, mold made, roll, impact drill bit, hard alloy products.
Tungsten is a kind of steel grey or silver white metal, with high hardness and hard melting point. Its atomic number is 74, the atomic weight of it is 183.85. The melting point of it is 3410℃, the boiling point of it is 5900℃, thermal conductivity is 10 to 100 for 174 w/m*k. Slow evaporation at high temperature, the thermal expansion coefficient is very small, the expansion coefficient at 0 to 100 ℃, 4.5 × 10-6 · K-1. The resistance of tungsten is about 3 times larger than the resistance of copper. Resistivity is at 20 ℃ for 10-8 ohm. M. Tungsten high hardness, high density (density of 19.25 g / cm 3), good elevated temperature strength, good electron emission performance.
Tungsten carbide base hard alloy currently used in general can be divided into tungsten carbide - cobalt, tungsten carbide, titanium carbide - cobalt, tungsten carbide, titanium carbide, tantalum carbide (NB) - cobalt and steel bonded cemented carbide and other four categories, in the current global annual consumption of about 50000 tons of tungsten, tungsten carbide hard alloy about 63%. According to the latest news, the total output of about 33000 tons / year of global cemented carbide, tungsten consumption total supply 50% ~ 55%.
Tungsten is a kind of steel grey or silver white metal, with high hardness and hard melting point. Its atomic number is 74, the atomic weight of it is 183.85. The melting point of it is 3410℃, the boiling point of it is 5900℃, thermal conductivity is 10 to 100 for 174 w/m*k. Slow evaporation at high temperature, the thermal expansion coefficient is very small, the expansion coefficient at 0 to 100 ℃, 4.5 × 10-6 · K-1. The resistance of tungsten is about 3 times larger than the resistance of copper. Resistivity is at 20 ℃ for 10-8 ohm. M. Tungsten high hardness, high density (density of 19.25 g / cm 3), good elevated temperature strength, good electron emission performance.
Tungsten carbide base hard alloy currently used in general can be divided into tungsten carbide - cobalt, tungsten carbide, titanium carbide - cobalt, tungsten carbide, titanium carbide, tantalum carbide (NB) - cobalt and steel bonded cemented carbide and other four categories, in the current global annual consumption of about 50000 tons of tungsten, tungsten carbide hard alloy about 63%. According to the latest news, the total output of about 33000 tons / year of global cemented carbide, tungsten consumption total supply 50% ~ 55%.