2023-07-10

Aluminium Oxide Hardness

If you are looking for high-quality products, please feel free to contact us and send an inquiry, email: brad@ihpa.net



Aluminium oxide (also known as aloxite or corundum) is an inorganic, hard and highly refractory chemical compound with the formula Al2O3. It is produced naturally from the mining of bauxite and is used as an abrasive and a refractory material. It is also used in the production of synthetic precious stones. Unlike iron, aluminium does not rust or corrode in water. For this reason, it is often used in electrical cables, aircraft, cars, buildings and food cans.

The natural hardness of alumina is what makes it such an excellent industrial abrasive. It is much less expensive than industrial diamond and is widely used in sandpaper and grinding applications, especially cut-off tools. It is also an essential ingredient in many types of sandblasting equipment and abrasives such as emery, garnet, walnut shell and talcum powder.

Alumina is extremely tough and hard, resistant to corrosion and abrasion and has an exceptionally high melting point. It can be shaped into a variety of forms and is commonly used in wear-resistant applications such as textile guides, tees, elbows, straight pipes, hydro cyclones, reducers and nozzles and for wear-resistant pump impellers.

Plasma electrolytic anodising with alumina results in a coating with a Mohs hardness of 9 which is second only to diamond. The hardness of the anodised coating is due to the high crystallinity of the alumina produced during this process which results in a much more compact and dense oxide layer than that produced by conventional direct current anodising procedures.

You may also like...