This technical information has been contributed by
Insaco Incorporated

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Machinable Ceramic Materials - Sapphire (alpha aluminum oxide)

PROPERTY UNITS VALUE

REMARKS

 Mechanical
 Density  gm/cc  3.97  
 Hardness  Knoop  1900

 parallel to the c-axis

 Knoop

 2200

 perpendicular to the c-axis

 Modulus of Elasticity  psi x 106  68  Young
 Flexural Strength  kpsi  ~100  
 Compressive
 Strength
 kpsi  425  
 Poisson's Ratio  -  ~0.28  Varies with
 Orientation
 Fracture Toughness  MPa m1/2  -  
 Electrical
 Dielectric Strength  ac volts/mil  1200  
 Dielectric Constant  average  11.5  parallel to the c-axis
 Volume Resistivity  ohm-cm2/cm  >1014 -
 Thermal
 Coefficient of
 Thermal Expansion
 x10-6/oC  5.4  parallel to the c-axis

 x10-6C

 4.3

 perpendicular to
 the c-axis
 Thermal Conductivity  W/moK  46  -
 Specific Heat  cal/goC  .16  -
 Max Working Temp  oC  2000  -
 Shock Resistance  oC diff.
 Optical
 Index of
 Refraction
 (Ordinary ray,
 No,c-axis)
 (Extraordinary ray,
 Ne,c-axis)

 1.768

 1.76

 -

 -

 Birefringence  (No-Ne)  0.008  -
 Transmission Band  Wavelength of microns  0.3--5.0  >80% transmission
All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer' s Data shown is blended from multiple sources and therefore illustrates the marketplace.

This technical information has been contributed by
Insaco Incorporated

Click here to find suppliers


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