High Purity Specialty Carbon Black BWA1 used in Metal Carbide Powder and Engineering Ceramics Carbide

Specialty Carbon Black is often used in metal carbides and engineering ceramics carbide raw materials.

Metal carbides such as tungsten carbide, titanium carbide, molybdenum carbide, niobium carbide, and tantalum carbide are all formed by the interaction of metals such as tungsten and carbon at a temperature of 1200~2000 °C.

In the cemented carbide system based on tungsten carbide and titanium carbide, in industrial production, specialty carbon black is used not only as a carbon material, but also as a heat insulating material for graphite tube resistance furnaces.

Practice shows that the lower the impurity in specialty carbon black (such as moisture, ash, volatile matter, sulfur content, etc.), the better it is, especially the sulfur content has a significant effect on the single crystal grain size in tungsten carbide particles and the structure of cemented carbide. When the carbon black sulfur content is low, the particle size of tungsten carbide is more uniform, and the bending strength of the alloy is higher.

Other carbides, such as silicon carbide, boron carbide, and zirconium carbide, are the main raw materials for engineering ceramics or high-temperature refractory materials. Carbon Black Powder

Traditional silicon carbide is produced by siliceous raw materials such as quartz sand and carbonaceous raw materials such as coke and anthracite in a high-temperature electric furnace (core temperature 200°C).

The raw material price is low, the reaction operation is simple, and α-SiC with stable performance can be easily prepared. The disadvantages are high energy consumption, and the resulting silicon carbide block is hard and low in purity. It takes a long time to crush and repeated purification to meet the particle size and purity requirements. There are also problems such as wide powder size distribution and uneven grain shape.

In order to reduce the reaction temperature and improve the particle size, crystal form and activity of silicon carbide products, many improvements have been made, such as using specialty carbon black to reduce SiO2 powder with a particle size below 10 μm to β-SiC in a non-oxidizing gas mist below 2000 °C.

In this way, without crushing, it can be used as a raw material for engineering ceramics after (or without) desiliconization and decarburization treatment. Pigment Carbon Black

As a carbide raw material, the main requirements for carbon black are high purity, less impurities, especially sulfur content, and easy dispersion.