Alumina Bubble Brick
Alumina Bubble Brick
Alumina bubble brick is a new kind of insulation brick, which has excellent high temperature energy saving effect. This brick is made of alumina bubble and the surface has many small holes, which stands for good insulation effect.
Alumina bubble bricks consist of alumina hollow balls that undergo high-temperature sintering at 1680°C (3056℉). These bricks possess a low density and exhibit excellent thermal insulation properties due to the small density and low thermal conductivity of the alumina hollow balls they are made from.
Alumina bubble is made of high purity alumina powder with fine particles. The manufacturing process of alumina hollow ball involves melting the alumina powder at high temperatures to transform it into a liquid state. This liquid is then blown into small droplets using high-pressure air, which subsequently shrink and solidify at lower temperatures. Besides, it results in the formation of hollow alumina spheres. Meanwhile, alumina bubbles are ideal thermal insulation filling materials for high-temperature kilns and high-quality aggregates for castable refractory.
Technical Data of Alumina Bubble Brick
Item/Grade | KB85 | KB90 | KB99 |
Max Service Temperature, ℃ | 1680 | 1700 | 1800 |
Al2O3 % | ≥85 | ≥90 | ≥99 |
SiO2 % | ≤13 | ≤8 | ≤0.2 |
Fe2O3 % | ≤0.2 | ||
Bulk Density, g/cm³ | 1.4-1.7 | ||
Cold Crushing Strength, MPa | ≥12 | ≥10 | ≥9 |
Reheating Linear Change, % (1600℃*3h) | ±0.3 | ||
Thermal Expansion Coefficient (Room temp-1300℃) | ~7.8 | ~8.0 | ~8.6 |
Thermal Conductivity Coefficient (1800℃), W/(m·K) | ≤0.8 | ≤1.3 | ≤1.5 |
Application of Alumina Bubble Brick
Due to the excellent physical and chemical properties of alumina bubble bricks, they have become one of the choices for high-temperature harsh environments. They not only withstand high temperatures but also provide good energy-saving effects. In order to maintain equipment stability and extend lifespan, they are widely used in the following high-temperature industrial equipment:
Steel and metallurgical industry: Ladles, tundishes, blast furnaces, steelmaking furnaces, refractory furnaces, molten iron transport equipment, preheating walls, flat storage chambers, coke ovens, reheating furnaces, induction kilns, molybdenum furnaces, tungsten rod furnaces, electric furnaces, and so on.
Petrochemical industry: Gasifiers, gasifiers, carbon black reaction furnaces, cracking units, reactors, catalyst carriers, and so on.
Ceramic industry: Ceramic kilns, ceramic storage chambers, and so on.
Cement industry: Cement kilns, and so on.
Glass industry: Glass kilns, glass storage chambers, and so on.
