Aluminum oxide is the reason why metal aluminum is not easily corroded in the air. Pure metal aluminum easily reacts with oxygen in the air, forming a dense aluminum oxide film on the surface of aluminum exposed to air. This type of alumina film prevents aluminum from being oxidized and is also used to protect chemical ceramic fillers in ceramics.

Aluminum oxide is divided into calcined aluminum oxide and ordinary industrial aluminum oxide. Calcined alumina is an important raw material for producing antique bricks, and industrial alumina can be used to produce microcrystalline stones. In traditional glazes, alumina is often used for whitening. Due to the popularity of antique bricks and microcrystalline stones in the market, their usage is also increasing year by year. Therefore, alumina appears in the ceramic industry. It takes Al2O3 as the main raw material and corundum as the main crystalline phase such as alumina ceramic mosaic lining tile.