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Sapphire ( Al2O3 99.9 )

Material Information

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Monofilament Powder Rod Sheet Sphere

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General Description:  

This is synthetically produced Sapphire. Single crystal Sapphire has a high thermal conductivity, volume resistivity, hardness and wear resistance, as well as a high upper use temperature. The energy band gap is large (10eV). Sapphire is a transparent material having useful transmission of wavelengths in the range 0.2 to 5.5 microns. It is much stronger than glass and can be used as viewing windows in high pressure and vacuum applications.
   

Chemical Resistance

Acids - concentrated Good
Acids - dilute Good
Alkalis Good
Halogens Good
Metals Good

Electrical Properties

Dielectric constant 7.5-11.5
Dielectric strength ( kV mm-1 ) 15-50
Volume resistivity @25C ( Ohmcm ) >1014

Mechanical Properties

Compressive strength ( MPa ) 2100
Hardness - Knoop ( kgf mm-2 ) 2000
Hardness - Vickers ( kgf mm-2 ) 1600-1800
Tensile modulus ( GPa ) 350-390

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 3.985
Refractive index 1.71-1.79
Useful optical transmission range 200-5500nm
Water absorption - saturation ( % ) 0

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 5.8
Melting point ( C ) 2050
Specific heat @25C ( J K-1 kg-1 ) 750
Thermal conductivity @20C ( W m-1 K-1 ) 35-40
Upper continuous use temperature ( C ) 1800-1950

Properties for Sapphire Monofilament

Property Value
Filament diameter 0.11mm
Density g cm-3 3.97
Melting point C 2050
Orientation <0001>
Tensile modulus GPa 410
Tensile strength GPa 2.1-3.4
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.
Standard products are available in these forms
Monofilament Powder Rod Sheet Sphere

Choose a form to search our on-line catalog