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Reactive alumina

Description

Reactive alumina is a modern high-quality material presented as a finely dispersed corundum powder with particle sizes starting from the submicron range (up to 4 microns). It is ready for use in this form.

The material is chemically inert: it is insoluble in acids, exhibits semiconductor properties, and decomposes only in an alkali melt. Reactive alumina is classified as a low-hazard substance (hazard class 4) and is fire- and explosion-proof.

Advantages

  • Lower synthesis and sintering temperatures of the required phases during firing – saving energy and accelerating the production cycle.
  • Reduced water demand for mixing concretes without compromising their rheological characteristics – resulting in a denser and stronger structure.
  • Stronger particle packing and a reinforced structure in low-cement and ultra-low-cement refractory castables, increasing resistance to aggressive reagents.
  • Improved operational and physical properties (mechanical strength, abrasion resistance, etc.) of concrete products due to the denser structure.
  • High chemical resistance and safety: insoluble in acids, non-flammable, low hazard to humans.

Applications

  • Production of highly heat-resistant refractories: low-cement and ultra-low-cement castables, linings, monolithic structures.
  • Manufacture of industrial (engineering) ceramics: adding reactive alumina as a dry powder to ceramic bodies improves quality and expands technical capabilities.
  • Creation of corundum refractories with reduced sintering temperature and controlled particle modality (mono-, bi-, and multi-fraction compositions).

FAQ

It is a finely dispersed aluminum oxide (Al₂O₃) powder with particle sizes up to 4 microns, produced using a special technology. Its key feature is high reactivity, which allows for lower sintering temperatures and the formation of a dense refractory structure.

It reduces the amount of mixing water without sacrificing flowability, enables denser particle packing, and thereby increases strength, abrasion resistance, and resistance to aggressive media. It also lowers the firing temperature, saving energy.

Yes, it belongs to hazard class 4 (low-hazard substances), is non-flammable and non-explosive. Standard respiratory protection is recommended when handling the powder.

It is used in the production of engineering ceramics, where the powder addition improves quality and broadens technological possibilities, as well as in other areas requiring high-purity corundum with controlled particle size distribution.