Applications by Material

Alumina (Al₂O₃)

Electrical Insulation· High Strength· Heat Resistance· Wear Resistance· Plasma Resistance· Chemical Resistance
Compatible with Diffusion Bonding

We introduce machining examples of alumina, the most widely used ceramic material.
It offers relatively low material cost and good machinability, making it suitable for a wide range of applications.

Typical properties of alumina

Item Vickers Hardness
HV (GPa)		 Fracture Toughness
(MPaｍ1/2)		 Maximum Service Temperature
(℃)		 Coefficient of Thermal Expansion
(×10-⁶/℃)		 Thermal Conductivity
(W/(m·K))		 Thermal Shock Resistance
(℃)		 Dielectric Strength
(kv/mm)		 Chemical Resistance
Chemical Formula·Purity
Al₂O₃
99.5%		 18 4 1,300
(In Air)		 8.5
(1000℃)		 30 200 >10 Relatively Good
Al₂O₃
99.9％		 18 4 1,500
(In Air)		 8.8
(1000℃)		 33 200 >10 Relatively Good

Applications Utilizing Material Properties

Item Features Applications
High Density · High Hardness and Wear Resistance
· High Fracture Toughness and Flexural Strength, Resistant to Cracking and Chipping 		· High-Precision Components
· Fixtures
· Wear-Resistant Components (e.g., Nozzles)
· Structures for High-Temperature Use
· Components for High-Temperature Use
· Crucibles (Hearth Liners)
· Electrical Insulation Components (e.g., Insulators)
· Especially for High-Temperature Insulation Applications
· Components for Reactive Gas Environments (e.g., Shower Plates)
· Components for Plasma Environments (e.g., Chamber Parts)
· Cylinder & Piston Components
Maximum Service Temperature
Low Thermal Expansion		 · High Maximum Service Temperature
· As an oxide, usable in air (oxidizing atmosphere)
· Relatively Low Coefficient of Thermal Expansion
High Dielectric Strength · High Electrical Insulation Performance
Good Chemical Resistance · As an oxide, usable in oxidizing environments
· Resistant to Acidic Gases
· High Plasma Resistance
Good Machinability · Relatively Good Machinability with Extensive Track Record and Established Processing Conditions

Machinable Sizes

Item Sizes (mm) Item Sizes (mm)
Plate Dimensions 500 × 800 × 30 Hole Diameter Φ0.1–
Rod Dimensions Φ100 × 300 Hole Depth –300
Grooves Width 0.05– Number of Holes Approx. 1–3,000 Pieces
Steps (Protrusions / Recesses) –70 Threads M1.6–

Alumina Machining Examples