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Formula: Al₂O₃ 99.9
Form: Single Crystal
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics
Sapphire Single Crystal is a single crystal form of sapphire, an extremely hard and durable material made of aluminum oxide. With a Mohs hardness of 9, sapphire has excellent scratch resistance. It also has high strength at elevated temperatures. Sapphire's unique properties make it ideal for use in applications like scratch-resistant windows, high power semiconductor substrates, and sensors for extreme environments. As part of Goodfellow's extensive range of single crystal products, Sapphire Single Crystal exemplifies both the durability and versatility of these advanced materials.
Tolerances
Single Crystal
| Orientation | See Item | |
|---|---|---|
| Thickness | +2% / -1% | |
| Length | +2% / -1% |
Material Properties for Ceramics
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Good |
| Acids - dilute | Good |
| Alkalis | Good |
| Halogens | Good |
| Metals | Good |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 7.5-11.5 |
| Dielectric strength( kV mm⁻¹ ) | 15-50 |
| Volume resistivity( Ohmcm ) | >10¹⁴@25 |
Physical Properties
| Element | Value |
|---|---|
| Refractive index | 1.71-1.79 |
| Useful optical transmission range | 200-5500nm |
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 3.985 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 2050 |
| Upper continuous use temperature( C ) | 1800-1950 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 750@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 35-40@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 5.8@20-1000°C |
Mechanical Properties
| Element | Value |
|---|---|
| Tensile modulus( GPa ) | 350-390 |
| Hardness - Knoop( kgf mm⁻² ) | 2000 |
| Hardness - Vickers( kgf mm⁻² ) | 1600-1800 |
| Tensile strength( MPa ) | 250-400 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 2100 |