Aluminum carbon brick is a carbon containing refractory material mainly composed of aluminum oxide (Al ₂ O3) and carbon (C), typically containing 35% to 85% Al ₂ O3 C 7%～35%, It is divided into two types: fired aluminum carbon bricks and unburned aluminum carbon bricks. Generally speaking, it belongs to aluminum carbon refractory materials, which are mainly divided into Al ₂ O ∝ - C bricks and Al ₂ O ∝ - SiC - C bricks according to their composition. The fired bricks are made of phenolic resin or asphalt binder, and are formed by isostatic pressing and sintered in a reducing atmosphere. They have the characteristics of high strength (pressure resistance of 110-120MPa) and low porosity, and are suitable for continuous casting sliding nozzle slides, immersion nozzles and other components; Unburned bricks are mainly composed of carbon and have better oxidation resistance than magnesia carbon bricks. They are commonly used as liners for iron pre-treatment and ladle lining. Its performance is optimized by adding zirconia (ZrO ₂), silicon carbide (SiC), etc., and it has high refractoriness, corrosion resistance, thermal shock resistance and other characteristics.
Physicochemical properties
Aluminum carbon bricks belong to the category of aluminum carbon refractory materials. Generally speaking, refractory materials mainly composed of Al ₂ O ∝ and C are called aluminum carbon refractory materials [6]. Aluminum carbon brick is a carbon containing refractory material mainly composed of aluminum oxide (Al ₂ O3) and carbon (C), typically containing 35% to 85% Al ₂ O3 C 7%～35%. Aluminum carbon bricks include two types: Al ₂ O Ⅲ - C bricks containing alumina and graphite, and Al ₂ O Ⅲ - SiC - C bricks containing alumina, silicon carbide, and graphite [6]. According to the production process, it can be divided into two categories: fired aluminum carbon bricks and unburned aluminum carbon bricks. Aluminum carbon bricks have high fire resistance, good chemical stability, and corrosion resistance. Adding ZrO ₂ to the ingredients can achieve good thermal shock resistance. The compressive strength of fired aluminum carbon bricks containing 72% to 85% Al ₂ O ∝ and 7% to 8% C can reach 110-120MPa, and the bending strength at 1400 ℃ can reach 25MPa; The compressive strength of fired aluminum carbon bricks containing 35% to 46% Al ₂ O ∝ and 30% to 37% C+SiC is 21-28MPa. Its performance characteristics are strong corrosion resistance, good thermal shock stability, high strength, and high thermal conductivity [6]. Burned aluminum carbon bricks belong to ceramic bonding or ceramic carbon composite bonding materials. Non fired aluminum carbon bricks belong to carbon bonded materials. Aluminum carbon bricks have significantly better oxidation resistance than magnesium carbon bricks and excellent resistance to Na ₂ O slag erosion. Its raw materials mainly include alumina clinker, corundum, flake graphite, silicon carbide, etc., and phenolic resin is commonly used as a binder. The general mix proportion is roughly as follows: coarse aggregate 40%~60%, fine aggregate 5%~20%, flake graphite 8%~15% SiC 4%~10%, Refractory powder 15%~25% and binder 4%~6%.
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