Alumina Carbon Bricks

Alumina carbon brick is also called aluminum carbon firebrick. It is a carbon-based refractory material made from corundum (high-grade bauxite, mullite, etc.) aggregates and fines, graphite, binders, and additives. According to the production process, alumina carbon composite refractory bricks are divided into burned aluminum carbon bricks and unburned aluminum carbon bricks.


Catalog

★ What are the Common Alumina Carbon Brick

Burned Micropores Alumina-Carbon Brick
Burned Micropores Alumina-Carbon Brick features
Burned Microporous Alumina-Carbon Brick Technique Data
Aluminium Carbon-based Refractories for Continuous Casting Tundish

★ Aluminum Carbon Bricks Application
★ Aluminum Carbon Bricks Manufacture Process
★ What are the Raw Materials and Binders of Aluminum Carbon Bricks

★ What are the Common Alumina Carbon Brick

1.Burned Micro-pores Alumina-Carbon Brick is mainly used for working lining of bosh above the air pip and belly. The average pore diameter of micro-pore alumina carbon brick is less than 1µm, and the volume percentage of the pores less than 1µm is no less than 70%.

Burned Microporous Alumina-Carbon Brick features

(1) Low porosity & low air permeability.
(2) high crushing strength & high thermal conductivity.
(3) Anti-slag, anti-alkali, anti-erosion ability.
(4) Good thermal shock stability.

Burned Microporous Alumina-Carbon Brick Technique Data

Item Index
RSAC-1 RSAC-2 RSAC-3
Al 2 O 3 ,% ≥ 65 60 55
C,% ≥ 11 11 9
Fe 2 O 3 ,% ≤ 1.5 1.5 1.5
Bulk density, g/cm 3 ≥ 2.85 2.65 2.55
Apparent porosity, % ≤ 16 17 18
Cold crushing strength, Mpa ≥ 70 60 50
Refractoriness under load(0.2Mpa, Ti) °C ≥ 1650 1650 1600
Thermal shock stability, times ≥ 100 100 100
Iron liquid corrosion index,% ≤ 2 3 4
Air permeability, mDa ≤ 0.5 2 2
Average pore size, mm≤ 0.5 1 1
Less than 1mm Pores volume percentage % ≥ 80 70 70
Anti-alkali performance,% ≤ 10 10 15
Thermal conductivity, w/m·k ≥ 13 13 13

2. Aluminium Carbon Refractories used for Continuous Casting Tundish, mainly include upper nozzle, lower nozzle, and stoppers, which are also called special-shaped aluminum carbon bricks. The raw materials of continuous casting nozzles and stoppers are corundum and graphite. A small number of additives are added to raw materials during the production process. Phenolic resin is used as a binder of alumina carbon nozzles and stoppers. After mixing, molding and drying, green bodies are burned in a non-oxidizing firing kiln. The firing temperature is 1350 °C, after machining, anti-oxidation coating can be spayed to the surface to prolong their service life.

Aluminum Carbon Refractories for Continuous Casting Tundish

(1) Good integrity and safe use.
(2) To better purify the molten steel.
(3) High strength, good resistance to molten steel, and slag erosion.
(4) Wear resistance and long service life.

★ Aluminum Carbon Bricks Application

Aluminum carbon bricks can be used in blast furnaces, continuous casting tundishes (long nozzles, submerged nozzles, stoppers, upper and lower nozzle bricks, slide plate bricks), ladle, hot metal cans, torpedoes, and other thermal equipment.

★ Aluminum Carbon Bricks Manufacture Process

Add graphite raw materials to alumina raw materials (corundum, mullite, bauxite), add small amounts of other raw materials such as silicon powder and SiC powder, then mixed with resin or asphalt binder, molded by press machine and finally fired at about 1300 ° C in a reducing atmosphere kiln.

★ What are the Raw Materials and Binders for Making Aluminum Carbon Bricks

For the unfired aluminum carbon bricks, the commonly used raw materials are corundum, mullite, first-grade high-alumina bauxite clinker, graphite, SiC, and Si powder. Commonly used binding agents are resin, tar, asphalt, and the like. Different raw materials should be used for the production of aluminum carbon bricks based on applications.

The above is a brief introduction to aluminum carbon bricks. If you need to purchase aluminum carbon bricks, RS Refractory can supply you with the best quality products at a competitive price. We can also customize refractory products according to your requirements and provide you best refractory materials and engineering solutions.

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