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Sapphire

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Sapphire/Ruby, monocrystalline corundum (alpha alumina)
Chemical composition: AL2O3
Property Value in metric unit Value in US unit
Density 3.98 *10³ kg/m³ 248.4 lb/ft³
Modulus of elasticity 430 GPa 62400 ksi
Tensile strength 414 MPa 60000 psi
Compressive strength 2400 MPa 350000 psi
Modulus of rupture 620 MPa 90000 psi
Hardness 2750 HV 2750 HV
Thermal expansion (parallel to C-axis) 6.7*10-6 ºCˉ¹ 3.7*10-6 in/(in* ºF)
Thermal expansion (perpendicular to C-axis) 5.0*10-6 ºCˉ¹ 2.8*10-6 in/(in* ºF)
Thermal conductivity 38 W/(m*K) 261 BTU*in/(hr*ft²*ºF)
Specific heat capacity 750 J/(kg*K) 0.18 BTU/(lb*ºF)
Max. working temperature 2000 ºC 3632 ºF
Dielectric strength (DC) 48 KV/mm 1220 V/mil
Dielectric constant (1MHz) 10 - 10 -

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sapphire.txt · Last modified: 2012/10/06 by dmitri_kopeliovich
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