Calcined alumina is a stable white powder with a hexagonal, close-packed crystal structure. It has a density of 3.9 g/cm² and a melting point of 2072°C. It exhibits high thermal stability and is highly soluble in water and acidic and alkaline solutions. However, at high temperatures, it reacts with strong bases to form aluminum hydroxide.
Calcined alumina is a common inorganic compound characterized by high hardness, wear resistance, and excellent chemical stability. It is often used in the manufacture of high-strength ceramic abrasives and catalysts. Specific applications are summarized below:
1. High-Strength Ceramic Materials
Due to its excellent properties, including high hardness, high density, low brittleness, wear resistance, and excellent insulation, calcined alumina is widely used in the preparation of high-strength ceramic materials such as cutting tools, ceramic heat storage devices, and thermoelectric converters.
2. Coating Materials
Calcined alumina powder has a uniform, fine particle size and a large specific surface area, making it suitable as a thickener, filler, and preservative in coatings. It also exhibits excellent UV resistance.
Calcined alumina, due to its high hardness, wear resistance, and excellent chemical stability, is widely used in the preparation of various abrasive materials, including grinding materials, grinding wheels, and sandpaper, and is often used for surface treatment of metal products.
III. Catalysts
Due to its high specific surface area and excellent chemical stability, calcined alumina is widely used in the preparation of various catalysts, such as ultrasonic Fann oxidation, hydrodenitrification, and catalytic cracking.
In addition, its excellent insulating properties and high-voltage electrical performance make it a valuable material in the manufacture of electronic components. With the continuous advancement of science and technology and the continuous progress of industrial production, the application areas of calcined alumina will continue to expand and deepen.
