Spherical Tungsten Carbide Powder
The appearance of spherical tungsten carbide powder is black powder, high purity ≥ 99.9%, sphericity ≥ 95%, melting point 2870°C, boiling point 6000°C, density 15.63g/cm³, bulk density greater than 7.0g/cm3, compact The density is greater than 7. 5g/cm3, the fluidity is less than 10.0s/50g, and it has the characteristics of high hardness, low thermal expansion coefficient, high compressive strength, large elastic modulus, and smooth surface.
As an important thermal spraying material and coating technology, tungsten carbide powder has been developing continuously and rapidly in recent years, and it is playing an increasingly important role in aerospace, electronic information, electric power, energy, petroleum, chemical industry, metallurgy, machinery and other industries. more important role. Tungsten carbide powder is a widely used spraying material in refractory metal powder. It is a eutectic composed of tungsten carbide and ditungsten carbide. The carbon content of the eutectic point of the eutectic is about 4.5% (mass), and the eutectic The temperature is 2525°C. Spherical tungsten carbide powder is a high-tech material for thermal spraying. Due to the uniqueness and excellent performance of the preparation technology, compared with ordinary polygonal tungsten carbide powder, spherical tungsten carbide powder has a spherical appearance and good powder fluidity. After coating, the workpiece The surface quality is high and the internal grains of the powder are fine and the hardness is high.
As one of the main raw materials for the production of cemented carbide, the physical and chemical properties of tungsten carbide (WC) powder, such as particle shape, particle size, particle size distribution, oxygen content, carbon content, bulk density, etc., will directly affect the quality of alloy products. With the gradual optimization of the cemented carbide process, the market demand for spherical tungsten carbide powder is also increasing. Spherical tungsten carbide powder is especially suitable for manufacturing processes such as 3D printing.
Production Process of Spherical Tungsten Carbide Powder
1) Melting method: the raw material powder (tungsten powder and carbon black or tungsten powder, carbon black and tungsten carbide) is melted into a liquid state, and the droplets will be in the centrifugal rotation method, rotary atomization method or gas atomization method. Spherical tungsten carbide is formed on the surface.
2) Modification of tungsten carbide with irregular shape: Melt WC with irregular shape into a liquid state, and then use plasma spheroidization method or resistive heating spheroidization method to make spherical tungsten carbide powder.
Spherical cast tungsten carbide powder produced by induction plasma process has high spheroidization rate (>95%) and good sphericity.
Application Field of Spherical Tungsten Carbide Powder
For the production of cemented carbide can be divided into tungsten-cobalt, tungsten-titanium-cobalt and tungsten-titanium-tantalum (niobium) cemented carbide. The coating with spherical cast tungsten carbide as the hard phase and molten nickel, cobalt and iron alloy as the bonding phase can strengthen the surface of mechanical parts, improve wear resistance, and prolong service life. It is used in mining, oil drilling, and construction machinery. And aerospace and other fields have a wide range of applications. Spherical tungsten carbide powder has excellent performance and can also be used in plasma transferred arc surfacing (PTA), laser cladding, thermal spraying and other production.
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