Alumina

Alumina is a ceramic material (Al2O3). Thanks to its availability and its properties it is very often used for the production of ceramic components. Alumina is used in various modifications. The most commonly used for technical ceramics is the Trigonal α-Al2O3 (corundum).

To produce aluminum oxide, the bauxite which is a natural raw material is digested into caustic soda through the Bayer process to produce aluminum hydroxide. This is deprived of the water by sintering or calcination in rotating kilns to obtain aluminum oxide.

Since the melting temperature is above 2000 ° C, it is excellent for use as a refractory material. The properties of the aluminum oxide are strongly influenced by the purity and the manufacturing process.

With the increase in the proportion of alumina, hardness, corrosion resistance, dielectric strength and thermal conductivity of the material increase. However, Resistance to thermal shock decreases.

According to the customer requirements, we are able to supply 99% of pure alumina products up to 36%.

The key characteristics are:

• good thermal stability;
• does not oxidize;
• excellent hardness – material next to diamond alumina, it has a Vickers hardness of 1600 MPa compared to that of a high speed steel which is only 900 MPa;
• excellent wear resistance – the duration of a ceramic component in applications under wear conditions is 10-14 times higher than that of the same steel component;
• corrosion resistance in acidic or alkaline environments;
• good electrical insulator – excellent dielectric properties from direct current at GHz frequencies;
• good thermal insulator;

The characteristics that make alumina a material unsuitable for various applications are:

• not high mechanical strength;
• low resistance to thermal shocks.

ALUMINA PRODUCTS:

• PIPES
  
• ROLLS
  
• SLEEVES
  
• BALLS CATALYST
  
• BRICKS
  
• STRAIGHT AND CURVED PLATES
  
• DETAILS ON THE DESIGN.