Calcined alumina is aluminum oxide that has been heated to temperatures above 1,050°C (1,900°F) to remove almost all of the chemically combined water. It is produced by heating source alumina powder at 1200-1300°C to convert into pure Al2O3. The alpha form is the densest and most stable crystalline form of alumina. Calcined alumina is commonly used in the production of high-quality ceramic shapes, fused alumina refractories and abrasives. It can be compressed to give a cooking density of 3.8 or more. Ceramic bodies containing 95% alumina or more are used to produce ceramic parts for many industries (fired at temperatures of 1400°C or higher). Calcined alumina particles are usually composed of monolayer crystals. It is also added to glazes in the tiling industry to impart dullness and texture (depending on particle size).
Calcined alumina applications
Structural ceramic
Calcined alumina is used to produce high-quality ceramic forms, such as spark plug insulators, integrated circuit packages, bone and dental implants, and laboratory instruments.
Technical ceramics
It is also used in the production of technical ceramics, which are used in various applications including electronics, aerospace and defense.
Refractory materials
Calcined alumina is used to produce refractories, which are used in high-temperature applications, such as furnaces, kilns, and incinerators.
Abrasive
It is used as a raw material in the production of fused alumina abrasives, used for grinding, cutting and polishing.
Polishing compound
Calcined alumina is used in polishing compounds for plastic, metal and glass surfaces. dewy: It is added to glazes in the tiling industry to impart dullness and texture, depending on particle size. In addition, for glazes with high fusion fluidity, the addition of pure calcined alumina powder can stabilize the fusion while retaining most of the visual effect.
Clay body
Alumina (preferably in calcined form) can be used in clay bodies as aggregate and filler in place of quartz. This can increase range, reduce weight and improve thermal shock resistance. Calcined alumina is prized for its purity, chemical inertness, corrosion resistance, extreme hardness, abrasion resistance, heat resistance and stability.
