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Alumina Oxide-starting A New Journey for the Ceramic Industry

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Update time : 2020-07-24 08:55:08

What is alumina oxide

Aluminum oxide , as a new type of high-purity material, has an increasingly obvious role. Alumina oxide is white fine powder, uniform particle size, easy to disperse, stable chemical properties, moderate high temperature shrinkage performance, good conversion rate of sintering performance, is the basic raw material for the production of heat-resistant and wear-resistant products. The main application fields of alumina oxide are the light-transmitting alumina sintered body, the carrier for the phosphor, and the additive for the special gas, etc., and the scope of application is very wide.

The characteristics of alumina oxide

Alumina oxide is a stable oxide of aluminum with a chemical formula of Al2O3. It is also known as bauxite in mining, pottery and materials science. Its shape is a white solid that is hard to dissolve in water, odorless, tasteless, hard texture, easy to absorb moisture without deliquescence (non-hygroscopic after burning). Amphoteric oxide, soluble in inorganic acid and alkaline solution, almost insoluble in water and non-polar organic solvents; relative density (d204) is 4, melting point is 2050℃.

Alumina is an amphoteric substance, which means it can react with acids and bases (such as hydrofluoric acid and sodium hydroxide), act as acids with alkalis, act as bases with acids, and can neutralize chemical reactions with each other This produces salt.


Other forms of alumina oxide

Alumina oxide is divided into calcined alumina and ordinary industrial alumina. Calcined alumina is an essential raw material for the production of antique bricks, while industrial alumina can be used to produce microcrystalline stone.

Corundum is the most common natural crystalline form of alumina. Ruby and sapphire are corundum forms with gem quality, and this is due to their unique colors. Ruby presents a unique deep red color and has a laser quality of trace chromium. Sapphire is given different colors by various impurities such as iron and titanium.

Application range of alumina oxide

Alumina is an electrical insulator, but for ceramic materials, this substance has a relatively high thermal conductivity and is insoluble in water. Alumina oxide is its most common crystalline form (called corundum or α-alumina), and its hardness makes it suitable for production as an abrasive and cutting tool component.


Alumina oxide is the reason for the weather resistance of metallic aluminum. Aluminum metal is highly reactive with oxygen in the atmosphere. The aluminum oxide passivation layer (thickness 4 nm) formed on any exposed aluminum surface requires hundreds of seconds to react to protect the metal from Corrosion and further oxidation. The alumina material can enhance the thickness and characteristics of the oxide layer through a process called anodization. Many alloys (such as aluminum bronze) improve their corrosion resistance by including a certain proportion of aluminum in the alloy, thereby exerting this effective characteristic. Alumina produced by anodization usually takes the form of an amorphous state, but discharge-assisted oxidation processes (such as plasma electrolytic oxidation) will form a large amount of crystalline alumina in the coating, thereby increasing its hardness.


In summary, alumina ceramics came into being in the ceramic industry. Alumina ceramics is a ceramic material with Al2O3 as the main raw material and corundum as the main crystal phase. Because of its high mechanical strength, high hardness, low high-frequency dielectric loss, high temperature insulation resistance, high chemical resistance and good thermal conductivity, it can be used as a raw material for the production of ceramics.


Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional aluminum oxide manufacturer with over 12 years experience in chemical products research and development. If you are looking for high quality aluminum oxide, please feel free to contact us and send an inquiry.

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