Aluminum carbon brick, also known as aluminum carbon refractory brick, is a carbonaceous refractory material made of corundum (high-grade bauxite, mullite, etc.) and graphite as main raw materials.
The fired aluminum carbon brick (abbreviated as fired aluminum carbon brick) belongs to the ceramic bond type, or belongs to the ceramic-carbon composite type. It is widely used as a sliding nozzle for continuous casting, a long nozzle, an immersion nozzle and a water inlet and outlet brick, and an integral stopper. The fired aluminum carbon brick becomes a long-life type refractory brick for ingots because of its high strength, high corrosion resistance and high thermal shock resistance.
Recent years, aluminum carbon products are widely used as linings for continuous casting skateboards, long nozzles, immersion nozzles, integral stopper rods, and hot metal pretreatment containers (such as torpedo tanks and hot metal cans) for their good performance.
Characteristics of firing microporous aluminum carbon bricks:
(1) Low porosity and low air permeability.
(2) High compressive strength and high thermal conductivity.
(3) Strong resistance to slag, alkali and corrosion.
(4) Thermal shock stability is good.
Technical Parameter of Alumina Carbon Brick:
| Item | Alumina Carbon Brick | ||
| Ingredient | AL2O3(%) | 55 | 65 |
| C | 11 | 12 | |
| SiC | 5.8 | – | |
| Normal temperature compressive strength(MPa) | 50 | 46 | |
| Apparent Porosity(%) | 10 | 8 | |
| Bulk Density(g/cm3) | 2.6 | 2.8 | |
| 0.2MPaLoad softening start temperature (℃) |
＞1680 | ＞1680 | |
| Anti Bending Temperature MPa ≥ | – | 14 | |
| Air permeability(MDa) | 0.4 | 0 | |
| Thermal Conductivity (W/m.k) | 300℃ | 8 | 10 |
| 600℃ | 9.2 | 11 | |
| 900℃ | 8.8 | 10.6 | |
| Coefficient of expansion | 300℃ | 7 | |
| 600℃ | 4.6 | – | |
| 900℃ | 4.8 | – | |
| Anti Alkali Srength (MPa) | 28 | 48 | |
