Why Alumina Ceramics Become More and More Popular?

Alumina (aluminium oxide) is a high hardness compound with a melting point of 2054 ° C and a boiling point of 2980 ° C. It belongs to ionic crystals that can be ionized at high temperatures, so it is often used to make refractory materials. As far as the alumina ceramic structure is concerned, its wear resistance is 15 times that of magnesia ceramics; its friction coefficient is 1/2 of that of magnesia ceramics. Alumina ceramic products have a higher surface finish and less friction, which prolongs the service life and saves costs.

The advantages of alumina are as follows:

1. Good thermal stability. It still maintains its good performance when used at high temperatures.

2. Stable chemical properties. Resistant to organic solvents, chlorides and strong acids and alkalis, and not easily degraded by microorganisms.

3. Great strength. Capable of operating under large pressure gradients without compression and creep.

4. Compared with polymer film, alumina products do not appear aging. As long as it is not damaged, it can be used for a long time.

5. Alumina is a white solid which is hardly soluble in water. It is odorless, tasteless and extremely hard.

The followings are the uses of alumina:

1. The main components of ruby and sapphire are alumina, which show different colors due to the content of impurities. Sapphire contains iron oxide and titanium oxide and is blue.

2. The main component of bauxite is feroxite, and the substance with the highest content is alumina. Industrially, ferrite is purified into alumina through the Bayer process, and then converted into aluminum metal by the Hall-Heroult process.

3. Aluminum reacts with oxygen in the air to form a dense aluminum oxide film covering the surface of aluminum exposed to air.

4. Aluminum is a good conductor of electricity and heat. The crystal form of alumina is suitable for abrasive materials and cutting tools because of its high hardness.

5. Alumina powder is often used as a vehicle for chromatographic analysis.

6. Tempered glass can be produced from alloys synthesized from aluminum and rare earth elements.

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