Calcined aluminium oxide is obtained from aluminium hydroxide from which the water is removed by calcination. A distinction is made between soft and hot calcined aluminium oxides.
Aluminium oxides have high mechanical strength and compressive strength as well as high temperature resistance. Calcined aluminium oxides are mainly used in ceramics or as polishing agents. Sintered aluminium oxide is used for refractory furnace linings, kiln furniture or laboratory equipment.
Calcined aluminium oxide (Al2O3) is an advanced ceramic material that has a wide range of industrial applications due to its outstanding physical and chemical properties. It is produced by calcining aluminium hydroxide at temperatures high enough to remove the water but retain the crystalline structure of the oxide. This process results in a material that is unrivalled in both purity and performance, making it an indispensable material in many technological and industrial fields.
Outstanding hardness and abrasion resistance
One of the most striking features of calcined aluminium oxide is its exceptional hardness, which makes it an ideal material for grinding and polishing applications. Its superior abrasion resistance ensures long-lasting performance in abrasives, from grinding discs to sandpaper, and helps to increase efficiency in the processing of metals, ceramics and other materials. These properties make calcined Al2O3 a favoured material in the manufacturing industry, where precision and durability are critical.
High thermal resistance for demanding environments
The high thermal resistance of calcined aluminium oxide allows it to be used in high temperature environments where other materials would fail. It retains its strength and stability at temperatures of up to 2,000 °C, making it an excellent material for high-temperature applications such as burner nozzles, thermocouple protection tubes and as an insulating material in thermal process equipment. This thermal resistance significantly expands the application possibilities of Al2O3 and enables the development of products that function reliably under extreme conditions.
Chemical stability under demanding conditions
In addition to its hardness and thermal resistance, calcined aluminium oxide is characterised by its excellent chemical stability. It is resistant to the effects of acids and alkalis, making it an ideal material for a wide range of chemical processes. This chemical resistance is particularly valuable in areas such as chemical processing, the pharmaceutical industry and in environments where corrosion resistance is essential. This property contributes to the longevity and reliability of products and equipment operating in chemically aggressive conditions.
Conclusion
Calcined aluminium oxide (Al2O3) is a material that improves efficiency, durability and performance in a wide range of applications. Its exceptional hardness and abrasion resistance, combined with high thermal and chemical resistance, make it an indispensable material in modern technology and industry. From abrasives to demanding high-temperature and chemical applications, calcined Al2O3 offers a reliable solution that meets the challenges of today's high-performance requirements.
