What are the Properties and Uses of Spherical Tungsten Carbide
The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the Tungsten Carbide?
What is Tungsten Carbide?
As one of the main production raw materials 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. Nowadays,
with the gradual optimization of the production process of cemented carbide, the
market demand for spherical tungsten carbide powder is also increasing.
Tungsten carbide is mainly composed of refractory metal tungsten and
non-metallic carbon, and contains a small amount of impurity elements such as
Co, Cr, Ti, Ta, Nb, V, Mn, Ni, Mo, O, etc. According to the different particle
size, it can be divided into the following grades, WC10 (1.01~1.40um), WC30
(3.01~4.00um), WC50 (5.01~7.00um), WC100 (10.01~14.00um) and so on.
Properties of spherical tungsten carbide
Appearance is black powder, high purity ≥99.9%, sphericity ≥95%, melting
point is 2870℃, boiling point is 6000℃, density is 15.63g/cm³, bulk density is
greater than 7.0g/cm3, tap density is greater than 7.0. 5g/cm3, the flow
performance is less than 10.0s/50g, and has the characteristics of high
hardness, low thermal expansion coefficient, high compressive strength, large
elastic modulus, and smooth surface. However, due to its high hardness, its
processing performance is poor, so it is more suitable for 3D printing.
Production process of spherical tungsten carbide powder
Smelting 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 droplets will form on the surface under the action of centrifugal
rotation method, rotary atomization method or gas atomization method Spherical
Modified irregular tungsten carbide: The irregular WC is melted into a liquid
state, and then the spherical tungsten carbide powder is made by the plasma
spheroidization method or the resistance heat spheroidization method.
Uses of spherical tungsten carbide
Mainly used in the production of cemented carbide. According to different
chemical compositions, cemented carbides can be divided into tungsten-cobalt,
tungsten-titanium-cobalt and tungsten-titanium-tantalum (niobium) types.
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