What is Calcined Alumina Used For?

Calcined alumina is produced by heating alumina hydroxide or industrial alumina at an appropriate temperature, in order to partially or fully convert it to Al2O3. It differs from activated alumina which has catalytic properties and can act as a desiccant.

This cone 6 matte glaze contains different amounts of super fine calcined alumina (4%, 8% and 15%) for added cutlery resistance; however the addition of the higher concentration (8% alumina) increases staining potential more than any of its counterparts.

Refractories

Alumina’s hardness and thermal stability make it the ideal material for producing refractory products designed to operate at high temperatures, as well as bedding material in heat treatment of alloy steel surfaces and producing porcelain accessories for dental treatment.

Calcined alumina is often employed as an electrical insulator in microelectronics due to its dielectric properties, which reduce interference and boost performance, creating faster, more reliable electronic devices. Furthermore, glass and ceramic manufacturers frequently employ it in their products to add strength and durability.

Calcined alumina comes in various grades to meet specific industrial applications. Each grade depends on particle size, crystal phase and soda content (low soda materials are best suited for electronic applications; medium and high soda content materials are used for electrical insulation and porcelains respectively); it’s made by firing bauxite through electric arc furnaces until alpha alumina forms via calcination at different temperatures before being ground and sized to various grain sizes for final sale.

Ceramics

Calcined alumina is used in ceramics due to its excellent compressive strength and abrasion resistance, low thermal expansion rate and resistance against chemical attack. Furthermore, it boasts electrical insulating capabilities which is key in modern electronics.

Alumina ceramics are used in products requiring high levels of durability and performance, such as insulators and catalyst supports for use in the petrochemical industry, to help reduce environmental pollution by supporting chemical reactions in more eco-friendly ways.

Calcination involves heating aluminum hydroxide at various temperatures to control its hardness and abrasiveness, before grinding to produce a fine powder used to formulate ceramic bodies and glazes. Once complete, these materials can withstand high temperatures while resisting abrasion, cracking, erosion and are ideal for fast temperature changes.

Electrical Insulators

Due to its electrical insulating properties, calcined alumina is widely utilized within the electronics industry. Microelectronics utilize it as an insulator against overheating or shorting out, while its dielectric properties further enhance performance while decreasing interference, leading to faster and more reliable devices.

Calcined alumina’s hardness and stability at high temperatures make it a valuable material for advanced ceramics. It can be found in structural pieces such as kiln furniture and ceramic plates, while it may also be added into glass composition for specialty items like lenses and laboratory glassware.

Calcined alumina’s versatility in particle size enables it to be used in polishing compounds, fillers and paints and coatings, as well as being key ingredients in producing refractory materials, glaze ceramics engineering ceramics wear-resistant ceramics as well as electronic component fabrication such as circuit substrates and insulators.