Technical Ceramics / Aluminium Oxide (Alumina)

All About Technical Ceramics

Corundum is the most common naturally occurring crystalline form of aluminium oxide. Rubies and Sapphires are gem-quality forms of corundum, which owe their characteristic colors to trace impurities.                                                                                                                             Rubies are given their characteristic deep red color and their laser qualities by traces of chromium. Sapphires come in different colors given by various other impurities, such as iron and titanium.

Corundum furnace liner

Corundum furnace liner

 

Al2O3  Aluminium Oxide / Alumina is an electrical insulator but has a relatively high thermal conductivity(30 Wm−1K−1[3]) for a ceramic material. Aluminium oxide is insoluble in water. In its most commonly occurring crystalline form, called corundum or α-aluminium oxide, its hardness makes it suitable for use as an abrasive and as a component in cutting tools.

Aluminium oxide is responsible for the resistance of metallic aluminium to weathering. Metallic aluminium is very reactive with atmospheric oxygen, and a thin passivation layer of aluminium oxide (4 nm thickness) forms on any exposed aluminium surface. This layer protects the metal from further oxidation. The thickness and properties of this oxide layer can be enhanced using a process called anodizing. A number of alloys, such as aluminium bronzes, exploit this property by including a proportion of aluminium in the alloy to enhance corrosion resistance. The aluminium oxide generated by anodizing is typically amorphous, but discharge assisted oxidation processes such as plasma electrolytic oxidation result in a significant proportion of crystalline aluminium oxide in the coating, enhancing its hardness.

Aluminium Oxide / Alumina

Aluminium Oxide / Alumina

Aluminium Oxide / Alumina
Aluminium Oxide / Alumina

 

Aluminium Oxide / Alumina

Aluminium Oxide / Alumina

Aluminium oxide lends itself to large component manufacturing if you have the correct equipment.

 

 

Aluminum oxide is one of the most used compounds in engineering processes. Due to its light weight, it is used to make airplanes, for example. Its slow reaction with oxygen and its high boiling point also make it suitable for use in cooking pans. Aluminum oxide exists in temperature-stable crystalline forms.

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium oxide.

Aluminum oxide is used to the manufacture of refractories because of its low reactivity with acids and its high boiling point. Refractories must resist heat, pressure and acidic environments. Aluminum oxide is used in the instrumentation of thermal test machines. In the electronic industry, it is used in making passive components for interconnection and in the making of resistors and capacitors.

With varying compositions ranging from 55%-99.8%,  The Multi-Lab Technology groups technical Alumina & Zirconia ceramics are suited to many market specific applications, particularly in the semiconductor industry, among many others !!

Multi-Lab is ideally placed to provide high and low volume Alumina ceramic materials and products within not only the semiconductor industry, but numerous market sectors. If you are interested in Multi-Lab products, please contact one of our materials engineers today.

 

For more information on any technical ceramic or Fused Silica (Quartz) materials or products, please feel free to contact us.

jules.blain@multi-lab.co.uk

 

 

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