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Corundum Brick: High-Grade Refractory Brick for Extreme High-Temperature Furnace Lining
Corundum brick is a premium
refractory product with corundum as its main crystalline phase, where the alumina (Al₂O₃) content exceeds 90%. It is manufactured by sintering high-purity alumina raw materials at ultra-high temperature. Thanks to its outstanding high-temperature performance and chemical inertness, corundum brick has become one of the most widely used
refractory materials for industrial kilns and furnaces worldwide.
Corundum is the mineral form of aluminum oxide, featuring extremely high melting point and hardness. After shaping and high-temperature sintering, corundum bricks form a dense microstructure, which can withstand long-term service under severe heat, slag erosion and mechanical abrasion. Our factory supplies standard straight bricks, arch bricks, wedge bricks and custom special-shaped corundum bricks according to customer drawings.
Key Performance Advantages
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Ultra-high refractoriness
Corundum brick can keep stable structure at temperatures above 1700℃. It maintains high mechanical strength under continuous high-temperature working conditions, suitable for long-cycle high-temperature production lines.
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Strong corrosion & slag resistance
The dense crystal structure effectively blocks penetration of molten metal, glass melt, acid and alkaline slag. It can resist chemical attack in both oxidizing and reducing atmospheres, greatly extending furnace service life.
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High density and low apparent porosity
Low porosity reduces the infiltration of molten media and corrosive gas, minimizing internal erosion and damage to the brick body. High bulk density brings superior wear resistance for furnace areas with scouring and friction.
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High mechanical compressive strength
It features excellent cold crushing strength and high-temperature flexural strength, able to bear heavy load and mechanical impact inside kilns.
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Stable thermal performance
Sintered corundum brick has moderate thermal shock resistance. Modified grades such as corundum-mullite brick provide better resistance against rapid temperature cycling.
Main Types of Corundum Brick
Al₂O₃ ≥99%, made from industrial fused white alumina, with ultra-low impurity content. It owns the best chemical stability and highest refractoriness. It is widely adopted in
glass kilns, petrochemical reformers and high-precision
ceramic kilns.
2. Sintered Corundum Brick
Al₂O₃ 90%~98%, balanced performance and cost. This is the most common grade for steel, cement and general high-temperature kiln lining. It combines good thermal shock resistance and slag resistance.
3. Composite Corundum Series Brick
Including chrome corundum brick, zirconium corundum brick and corundum mullite brick. By adding extra components, these composite bricks optimize targeted properties, such as improved anti-spalling or stronger resistance to special corrosive media.
Industrial Application Fields
Iron & Steel Metallurgy
Used for lining of electric arc furnaces, refining furnaces, steel
ladles, tundishes and hot blast stoves. It works in zones exposed to molten steel and slag scouring.
Glass Manufacturing Industry
Applied in glass melting furnace bottom, sidewall, regenerator checker bricks and feeding channels, resisting erosion from high-temperature molten glass.
Petrochemical & Chemical Industry
Serves as lining for secondary reformers, cracking furnaces and gas generators. It handles high temperature and hydrogen corrosion in chemical reaction systems.
Ceramic & Kiln Industry
Lining for tunnel kilns, shuttle kilns and roller kilns for firing ceramics, porcelain and refractory products.
Non-Ferrous Metal & Cement Industry
For aluminum, copper, nickel smelting furnaces and high-temperature zones of cement
rotary kilns. It also works for waste incinerators with harsh corrosive flue gas.
Technical Specifications Reference
For 99% high purity corundum brick, Al₂O₃ content is no less than 99%, bulk density reaches 3.2g/cm³ or above, apparent porosity below 19%, cold crushing strength ≥100MPa, refractoriness under load over 1700℃.
For 95% grade corundum brick, Al₂O₃ ≥95%, bulk density ≥3.1g/cm³, apparent porosity ≤18%, cold crushing strength ≥100MPa, refractoriness under load ≥1700℃.
For 90% grade corundum brick, Al₂O₃ ≥90%, bulk density ≥2.95g/cm³, apparent porosity ≤18%, cold crushing strength ≥90MPa, refractoriness under load ≥1680℃.
Manufacturing & Custom Service
We produce corundum bricks through strict raw material screening, batching, pressing forming and high-temperature shuttle kiln sintering. We support custom sizes and special shapes according to furnace design drawings. Free samples can be provided for customer lab testing.
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