The physical and chemical properties of self baked carbon bricks undergo significant changes during the roasting process, as follows:

1. Volatile matter

Self baked carbon bricks use coal tar pitch as a binder, with a volatile content of about 11%. The emission of volatile content is not significant before the product temperature reaches 200 ℃; Gradually increase after 200 ℃; Discharge slows down above 500 ℃; It basically ends after about 1100 ℃.

2. Mechanical strength

As the temperature increases, the binder begins to soften, the bonding force between carbon particles decreases, and the strength of self baked carbon bricks decreases. At 400 ℃, it reaches its lowest point. This is because a large amount of volatile matter is discharged during this stage, the porosity increases, and the bonding effect between particles deteriorates. Therefore, the strength of carbon bricks is very low. After 450 ℃, as the temperature continues to rise, the binder undergoes coking and the formation and hardening of the coking network, resulting in a gradual increase in the strength of the carbon block. The changes in strength and temperature (see Figure 1).

3. Shrinkage of volume

When the self baking carbon block is around 100 ℃, it begins to soften and its volume begins to increase. It reaches its maximum value at around 400 ℃ and begins to contract at 400 ℃. After reaching 800 ℃, the shrinkage rate sharply decreases. After further heating, there will be a slower shrinkage. Generally, the self baking carbon block after roasting can contract by 1% to 3%.

4. Other performance changes

After self baked carbon bricks are roasted, their antioxidant capacity, resistance to molten iron erosion, and resistance to slag erosion are enhanced; There is a significant improvement in thermal conductivity.

The true density increases with increasing temperature. When the calcination temperature is lower than the raw material calcination temperature, the main reason is that the coking of the binder leads to an increase in true density, and the increase in amplitude is relatively small at this time; When the calcination temperature exceeds the raw material calcination temperature, the carbon bricks begin to graphitize, and the true density increases rapidly at this time.

The variation of bulk density with temperature is more complex, and overall, the bulk density decreases with the emission of volatile matter from carbon bricks.

Xinghui New Materials mainly produces anti-corrosion carbon bricks and refractory materials, with complete production equipment, advanced technology, rich production experience, and complete testing equipment; The quality of anti-corrosion carbon bricks and other products is stable and reliable, from raw materials to finished products, layer by layer inspection; Production, supply and sales processes, networked monitoring; We will continue to ensure that the quality of anti-corrosion carbon bricks meets customer expectations.

Our company produces acid resistant and corrosion-resistant carbon bricks using a unique process, using high-quality graphite carbon materials and adding organic compounds with strong acid resistance. They are refined through high-pressure molding, vacuum impregnation, and high-temperature heat treatment processes, and have extraordinary acid and temperature resistance. They are ideal lining materials for equipment such as chemical phosphoric acid reaction tanks and phosphoric acid storage tanks; The company has formed a one-stop operation pattern and service system for scientific research and design, production and sales, and on-site construction. Can produce according to user requirements and fully meet customer requirements. Welcome new and old customers to call and write to discuss cooperation matters.