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Ruby ( Al2O3 /Cr2O3 /Si2O3 )

Material Information

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General Description:  

Ruby exhibits identical properties to those of Sapphire. Small amounts of impurities give Ruby a red colouration.
   

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 ) 2500-3000
Tensile modulus ( GPa ) 350-390

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 3.98
Useful optical transmission range 150-5500nm
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

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