Alumina Ceramics

• 95%-99.9%  high purity Alumina
• High purity re-crystalized Alumina
• Zirconia toughened Alumina (ZTA)

High-Temperature Ability – Alumina can be used in both oxidizing and reducing atmospheres up to 1650°C (2900°F) and in vacuum environments 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

• Wire and thread guides
• Mechanical seals
  • Seal faces
  • Valve seats
• Machine components
• High temperature electrical insulators
• High voltage insulators
• Electronic components & substrates
• Ballistic Armor
• Roller & Ball Bearings
• Wear resistant linings
• Semiconductor parts
• Laser cavities
• Tap plates
• Shot blast nozzles
• Knife Sharpeners
• Precision shafts and axles in high wear environments

Alumina can be machined in green, biscuit, or fully dense states. While in the green or biscuit form it can be machined relatively easily into complex geometries. However, the sintering process that is required to fully densify the material causes the alumiuna body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining alumina pre-sintering.

In order to achieve very tight tolerances, fully sintered material must be machined/ground with diamond tools. In this process a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. Due to the inherit toughness and hardness of the material, this can be a time consuming and costly process.