Refractory bricks, high alumina bricks and clay bricks are common refractory materials, and they are different in composition, performance and application scenarios. The following are their detailed comparisons:

I. Ingredients of raw materials

(1) Clay brick:

Main raw materials: refractory clay.

Alumina content: generally 30%-48%.

(2) High alumina brick:

Main raw materials: bauxite or other raw materials with high alumina content.

Alumina content: usually more than 48%, and the alumina content of some high-alumina bricks can even exceed 80%.

(3) Refractory bricks:

It is the general name of all shaped refractory materials, with diverse components, including alumina, magnesia, silica and so on.

II. Fire resistance

(1) Clay brick:

Fire resistance: about 1580℃-1750℃.

(2) High alumina brick:

Fire resistance: more than 1770℃, usually more than 1790℃.

(3) Refractory bricks:

The range of fire resistance is wide. According to different specific types, the fire resistance ranges from 1580℃ to more than 2000℃.

III. Corrosion resistance

(1) Clay brick:

Acid resistance and corrosion resistance of neutral slag are good, but alkali resistance is weak.

(2) High alumina brick:

The corrosion resistance of alkaline and acidic slag is good, and the overall corrosion resistance is better than that of clay brick.

(3) Refractory bricks:

According to different types, the corrosion resistance varies greatly. For example, corundum bricks have higher corrosion resistance.

IV. Thermal conductivity and thermal shock resistance

(1) Clay brick:

It has low thermal conductivity and good thermal shock stability, and is more suitable for environments with frequent temperature changes.

(2) High alumina brick:

The thermal conductivity is high, but the thermal shock stability is slightly lower than that of clay brick, which is more suitable for continuous high temperature environment.

(3) Refractory bricks:

The performance is quite different, for example, silicon carbide bricks have high thermal conductivity, while some thermal insulation firebricks have low thermal conductivity.

V. Application fields

(1) Clay brick:

It is often used in low-temperature areas with frequent thermal shock and no hardening erosion, such as lining, flue and heating furnace of industrial furnaces.

(2) High alumina brick:

Commonly used in high temperature areas, high mechanical stress, harsh conditions of chemical erosion (especially in alkaline environment), such as steelmaking furnaces, glass kilns, rotary kilns, etc.

(3) Refractory bricks:

It is widely used, including high-temperature equipment in steel, cement, glass, chemical industry and other industries.

VI. Economy

(1) Clay brick:

The cost is low and economical.

(2) High alumina brick:

The cost is higher because of its high alumina content and superior performance.

(3) Refractory bricks:

Prices vary widely, ranging from economical to high-end according to specific types and components.

VII. Other characteristics

(1) Clay brick:

Low porosity, high strength at room temperature and high temperature, corrosion resistance and wear resistance.

(2) High alumina brick:

High load softening temperature, strong corrosion resistance and good thermal shock stability.

(3) Refractory bricks:

The performance is diverse, and it has different fire resistance, corrosion resistance and mechanical strength according to specific types.

VIII. Summary

The choice of refractory brick, high alumina brick or clay brick depends on the specific use environment and performance requirements. If a medium-low temperature environment is needed and cost control is important, clay brick is an economical choice; For the environment with high temperature, high strength and high corrosion resistance, high alumina brick is more suitable.