HOMETechnical Know-HowCharacteristics of Aluminum Oxide



Of all precision ceramic materials that our company is manufacturing, the most representative material is aluminum oxide.

The reason that aluminum oxide materials are more commonly used than any other precision ceramic material is because they have a wide range of incomparable properties and are relatively inexpensive.

In terms of material characteristics, there are materials with better properties than those of aluminum oxide, but that also entails that aluminum oxide features better properties than those of the other materials which are used only under particular conditions. Aluminum oxide is therefore more widely used.
Electromagnetic Insulating Properties

The insulating properties of electromagnetism of aluminum oxide has higher resistance to other insulators even when temperature rises, if the material has the volume resistance of 10 (Ohm) × cm or higher. That's why aluminum oxide is most widely used for spark plugs, high-pressure insulators, high-frequency insulators, and integrated circuit boards.



Heat Resistance
The melting point of aluminum oxide is as high as 2,047℃ (even the ordinary polycrystal aluminum oxide can be used at 1,600℃ or higher) and maintains its strength at high temperature, which allows it to be used for thermocouple protective tubes, heat exchangers, flame spray nozzles of argon torch, combustion tubes for chemical and physical analysis, and melting pots.


Chemical Stability
Aluminum oxide remains stable even in corrosive gas or liquid, such as acid or alkali, does not react easily, and therefore is widely used in precision chemical reaction containers and reaction catalyst carriers.


Mechanical Possibility
Aluminum oxide features the MOHS hardness of 9 and excellent mechanical strength, which allows it to be used for 사도, capstans for wire-drawing devices, foils for paper making, forming boards, bearings, pump parts, tools for metal manufacturing (Bite), wear-resistant liners, bulletproof materials, etc.


Other
Using its light penetrating property and high-temperature strength, aluminum oxide can be used for sodium tubes. Since it does not cause a reverse reaction against high-hardness materials and the human body, the material can be used for artificial dental implants and artificial joints. Combining two or more of its properties, aluminum oxide can be applied in a variety of fields.


Low Costs
Aluminum oxide is a mineral, the second most common to quartz of all minerals existent on earth. It is manufactured and sold at the lowest cost because it is easy to refine and allows the production of highly pure products only through simple fixing.