Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and control is to minimize transmission and fatality rate. Omicron has a low case fatality rate but is highly transmissible and can still claim many lives in large outbreaks. "Total openness is not applicable in China. For China, we should keep to the dynamic zero-out and gradually open up."
However, "dynamic zero clearance" is not the pursuit of complete "zero infection". As the Novel Coronavirus has its own uniqueness and strong concealment, there may be no way to prevent the detection of cases at present, but rapid detection and prompt treatment must be carried out, as soon as one case is found, one case will be dealt with.
The situation in Shanghai is serious. As the financial center of China, Shanghai is a very important city, and the outbreak of the epidemic in Shanghai will put a great impact on China's economy. The current task is to contain the spread of the epidemic as soon as possible, to achieve social zero so that Shanghai's life and economy quickly return to normal.
As China plays an important role in the global supply chain, the outbreak will have a significant impact on the supply and prices of many 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 tungsten carbide.
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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The resurgence of the global COVID-19 pandemic and the impact of the Russia-Ukraine conflict continued to cause high volatility in commodity prices. Stubbornly high inflation and rising commodity prices are likely to influence each other and thus push each other higher. The price of the Tungsten Carbide may not decrease significantly in the short term.
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