Project Description


  • High thermal conductivity as high as metallic aluminum, 7 times higher than aluminum oxide (Al2O3)
  • Similar coefficient of thermal expansion to that of silicon (Si)
  • High electric insulation
  • Highly resistant to plasma under fluorine-based gas atmosphere
  • Highly dense and fine-grained structure

Manufacturing Options

  • Roll compacting
  • Isostatic pressing
  • Tape casting

Advanced Finishing Services

  • Precision grinding and lapping
  • Laser machining
  • Engineering design and support
  • Metallizing

Density gm/cc 3.26
Crystal Size (Average) Microns 3
Water absorption (open porosity) % 0
Gas permeability % 0
Color ¯ Gray

Flexural Strength (MOR) 20°C MPa (psi x 103) 340
Elastic Modulus 20°C GPa (psi x 106)  330
Poisson’s Ratio 20°C ¯  0.25
Compressive Strength 20°C MPa (psi x 103)  –
Hardness GPa (kg/mm2)  11
R45N  –
Tensile Strength 25°C MPa (psi x 103)  –
Fracture Toughness K(I c) mpa m1/2  3

Thermal Conductivity 20°C W/m K 80.0
Coefficient of Thermal Expansion 25-1000°C X 10-6/°C 5.0
Specific Heat 100°C 880 J/kg*K 740
Thermal Shock Resistance   ΔTc  °C
 Maximum Use Temperature   °C  800

Dielectric Strength 6.35mm ac-kV/mm (ac V/mil)  17
Dielectric Constant 1 MHz 25°C  9
Dielectric Loss (tan delta) 1 MHz 25°C  <0.001
Volume Resistivity 25°C ohm-cm
                            500°C ohm-cm
                            1000°C ohm-cm

*The chart is intended to illustrate typical properties. Property values vary with method of manufacture, size, and shape of part. Data contained herein is not to be construed as absolute and does not constitute a representation or warranty for which Ortech, Inc. assumes legal responsibility.