Alumina ceramic, also known as alumina or aluminum oxide (Al2O3), is an industrial oxide ceramic known for its extreme hardness and high thermal conductivity. The properties of alumina ceramic makes it one of the most widely used ceramics for structural, wear, and corrosive environments. Alumina ceramics are typically manufactured from bauxite and can be formed using a variety of manufacturing processes inclusive of injection moulding, die pressing, isostatic pressing, slip casting and extrusion. 

Alumina is characterized by high hardness, excellent resistance to corrosion, thermal stability, good dielectric properties (for converting from DC to GHz frequencies), low loss tangent, and stiffness. 

Properties of Alumina Ceramics

• Depending on the content of Al2O3 and additives used, there are different series of aluminum oxide materials.

• Based on the Al2O3 content, alumina can be categorized as 75% alumina, 85% alumina, 95% alumina, 99% alumina, and so on.

• Based on the difference in crystal phase, there are mullite, corundum-mullite, and corundum;

• Alumina is an excellent electrical insulator that is resistant to extremely high currents, and its resistance to electricity increases with its purity. 

• Alumina also has a very high melting point and strong mechanical strength. However, its mechanical strength decreases when the temperature goes above 1000 degrees Celsius. Due to the vast difference in its coefficient of thermal expansion, its resistance to thermal shock is less effective when exposed to very high temperatures.

• The excellent chemical stability of alumina is the major contributor to its high resistance to corrosion.

• Pure alumina can resist chemical corrosion, making pure alumina the main choice for engineering components in several industrial applications. Its resistance to corrosion by chemicals is due to its low solubility in those chemicals.

• The introduction of additives can enhance the physical and chemical properties of alumina. These additives, combined with different production processes, can help in the production of alumina ceramics of varying sizes and shapes.

• As you may know, alumina ceramics are similar to aluminum nitride based on their good thermal conductivity and good electrical insulation properties.

Applications for Alumina Ceramics

• Because of their excellent chemical stability, alumina ceramics are used widely in acid-resistant pump impellers, pump bodies, acid-carrying pipe linings and valves.

• With an alumina content higher than 95%, alumina ceramics can be used as excellent electrical insulators. They also have a low dielectric loss, with a wide range of applications in electronics and electrical appliances.

• Aluminum oxide ceramics are used in the manufacture of textile wear parts and knives. This is due to their extreme hardness and wear resistance.

• Alumina ceramic materials are used in making spark plugs, which are useful in a wide variety of engines.

• Transparent alumina ceramics are used in making high-pressure sodium lamps and infrared detection window material.

• Transparent aluminum oxide shows good permeability to visible light and infrared rays.

• Other essential applications of alumina ceramics can be seen in seal rings, medical prostheses, laser tubes, thermocouple tubes, electronic substrates, ballistic armor, electrical insulators, grinding media, and wear components.

Anderman Ceramics are the one-stop shop for Alumina Ceramics. Our vast experience in material properties, forming methods and usage application makes us the supplier partner of choice for our 750+ global customers.

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