Calcined alumina is aluminum oxide that has been heat treated to transform it into alpha alumina and comes in various crystal sizes, soda content levels and degrees of calcination.
Aluminum oxide is widely used as an essential component in refractory bricks and castables to line furnaces, kilns, reactors operating at high temperatures as well as ceramic tile and porcelains products.
Versatility in Particle Size
Calcined alumina is an integral component of many refractory materials used in industries like steelmaking, ceramics manufacturing and glass production. It offers superior heat and wear resistance while boasting thermal stability and chemical inertness – essential features in today’s industries such as steelmaking.
Industry grade calcined aluminas can be distinguished from one another based on crystal size, soda content and degree of thermal conversion into alpha phase (low soda for electronics and electrical insulation applications; medium and high sodium for glass, glaze and porcelain; casting/gunning mixes with high sodium content are examples of differentiating characteristics). Furthermore, particle distributions may also vary to suit various applications.
Calcined alumina oxide stands out as an exceptional hardness material (9 on the Mohs scale, which ranks higher than diamond) due to its extreme hardness (9 Mohs), excellent electrical conductivity, thermal stability properties and good electrical conductivity, making it an excellent sintering agent and filler. As such it promotes dense yet lightweight ceramic formation. Furthermore it’s used as a filler in coatings and paints, helping enhance mechanical properties.
Chemical Resistance
Calcined alumina is well known for its chemical inertness and resistance to corrosion, making it an excellent support material for catalytic reactions. Due to its large surface area and stability, calcined alumina can withstand intense chemical transformations without degradation; furthermore, its insulating properties help prevent microelectronics from overheating or short-circuiting and make calcined alumina an indispensable component in both electronic devices and industrial equipment.
Calcined alumina (the white powder form of commercial aluminum oxide) has been processed through multiple heating and cooling stages in order to drive off nearly all of its water content, producing an exceptionally hard material (9 on Mohs scale), with excellent wear resistant characteristics, chemical purity levels exceeding 98%, extreme temperature tolerance tolerance tolerance tolerance, dimension stability properties and dielectric properties. we offer various grades of calcined alumina classified by soda content particle size and calcination level in order to meet specific industry demands.
Low soda calcined alumina is widely used as a component in refractory materials used to line furnaces and kilns in order to withstand extreme temperatures, prolong their lives, as well as increase strength and durability of products such as abrasives, cutting tools, wear-resistant components etc.
Thermal Stability
Calcined alumina’s low porosity, high permeability and extreme hardness make it the ideal material for high performance refractories and ceramics. Available in various grades with different heat treatments, crystal sizes and soda contents to meet specific industrial applications, it comes in an extensive array of grades with different heat treatments, crystal sizes and soda contents to meet industrial applications.
Calcined alumina is produced by heating aluminum hydroxide at high temperatures to evaporate any chemically bound water, leaving behind dense, more stable, and harder material compared to its hydrate counterpart. Due to the large, tablet-shaped crystals it produces, this form of alumina is commonly known as alpha alumina.
High-grade calcined alumina offers operational stability and reliability across a wide temperature range, used in coatings to increase abrasion resistance, scratch resistance and corrosion protection; in ceramic tile production for glaze surface tiles; as anti-skid materials to prevent slips on roadways; and used by electronics industries as an insulator or resistor to help minimize power losses on circuit boards due to its thermal conductivity.
Hardness
Alumina ceramics’ extreme hardness makes them the perfect material to line furnaces and kilns with, providing superior resistance against both heat and chemical attacks, lengthening their service lives as essential pieces of equipment.
Calcined alumina stands out in terms of abrasion resistance as well, ranking above steel and tungsten carbide on the Mohs hardness scale. It can withstand mechanical wear without suffering wear-related damage without becoming compromised in integrity, ranking above these materials on this aspect of performance.
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