Aluminum Oxide:
Aluminum Oxide is usually applied to industries such as semiconductors, solar power, optic industry. While the products mostly used as ceramic arm, ceramic ring, ceramic finger, ceramic bush, ceramic life pin, ceramic gasket. The major properties include as following: electric insulation, high temperature resistance.
It possesses strong ionic inter atomic bonding giving rise to its desirable material characteristics. It can exist in several crystalline phases which all revert to the most stable hexagonal alpha phase at elevated temperatures.
Aluminum Oxide is one of the most cost effective and widely used material in the family of engineering ceramics. The raw materials from which this high performance technical grade ceramic is made are readily available and reasonably priced, resulting in good value for the cost in fabricated alumina shapes. With an excellent combination of properties and an attractive price, it is no surprise that fine grain technical grade alumina has a very wide range of applications
The composition of the ceramic body can be changed to enhance particular desirable material characteristics. An example would be additions of chrome oxide or manganese oxide to improve hardness and change color. Other additions can be made to improve the ease and consistency of metal films fired to the ceramic for subsequent brazed and soldered assembly.
Hard, wear-resistant, excellent dielectric properties from DC to GHz frequencies, resists strong acid and alkali attack at elevated temperatures, good thermal conductivity, excellent size and shape capability, high strength and stiffness, available in purity ranges from 94%, an easily metallizable composition, to 99.8% for the most demanding high temperature applications.
The processing of Aluminum Oxide start from CIP(Cold Isostatic Pressing), raw material processing, then high temperature sintering. Once sintering Aluminum Oxide, it can only be machined using diamond-grinding methods. It features high hardness and wear resistance, low erosion levels, high temperature resistance, corrosion resistance. Additionally, it can be highly polished making it useful for precision sealing applications like pumps and pistons.
Aluminum Oxide is an excellent high temperature ceramic material due to its high temperature stability. It is the most commonly used type of advanced ceramic and is available in purities ranging from 95 – 99.9%. Precision Ceramics has access to many different types of Alumina including: injection molded, die pressed, isostatically pressed, slip cast, and extruded.
The main properties of Alumina Oxide:
High Temperature Ability – Alumina can be used in both oxidizing and reducing atmospheres up to 1650°C (2900°F) and in vacuum furnaces up to 2000°C (3600°F).
Abrasion Resistant – Alumina is a very hard ceramic and is excellent at resisting abrasion. It is ideal for wear-resistant inserts or products.
Electrical Insulator – Alumina is commonly used as a high temperature electrical insulator, particularly the higher purity grades which offer better resistivity.
Chemical Resistance – Alumina offers good resistance to strong acids and alkalis at elevated temperatures and is ideal for applications where resistance to corrosive substances is required.
- High hardness
- Wear & abrasion resistant
- High compressive strength
- High mechanical Strength
- Resists strong acid and alkali attack at high temperatures
- Excellent electrical insulation properties
- Decent thermal conductivity