Sample Products

Alumina Oxide Ceramics Al2O3

Alumina Ceramics is the most widely used fine ceramics material. This material has superb material characteristics such as high electrical insulation, high mechanical strength, high wear and chemical resistance.

Ortech provides state-of-the-art technical alumina ceramics manufacturing by the most cost-effective processes. Ortech maintains efficient manufacturing facilities that support quick-turn prototype development and high volume production.

Advanced Finishing Services

  • Precision grinding and lapping
  • Laser machining
  • Engineering design and support
  • Metallizing
  • Alumina Ceramics-to-metal brazing
  • Specialized coatings
  • Threaded components
  • Precision motion components
  • Complex cleanroom assemblies

Manufacturing Options

  • Injection molding

  • Roll compacting
  • Co-firing
  • Isostatic pressing
  • Dry pressing
  • Hot pressing
  • Tape casting
  • Slip casting

Material Properties (Alumina 99.8%)

Density gm/cc 3.92
Crystal Size (Average) Microns 6
Water absorption (open porosity) % 0
Gas permeability % 0
Color ¯ Ivory
Flexural Strength (MOR) 20°C MPa (psi x 103) 375 (54)
Elastic Modulus 20°C GPa (psi x 106)  370 (54)
Poisson’s Ratio 20°C ¯  0.22
Compressive Strength 20°C MPa (psi x 103)  2500 (363)
Hardness GPa (kg/mm2)  14.1  (1440)
R45N  83
Tensile Strength 25°C MPa (psi x 103)  248 (36)
Fracture Toughness K(I c) mpa m1/2  4-5
Thermal Conductivity 20°C W/m K 30.0
Coefficient of Thermal Expansion 25-1000°C X 10-6/°C 8.2
Specific Heat 100°C 880 J/kg*K 880
Thermal Shock Resistance   ΔTc  °C 200
 Maximum Use Temperature   °C  1750
Dielectric Strength 6.35mm ac-kV/mm (ac V/mil) 8.7 (220)
Dielectric Constant 1 MHz 25°C  9.8
Dielectric Loss (tan delta) 1 MHz 25°C  <0.0001
Volume Resistivity 25°C ohm-cm  >10
                            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.

Material Properties (Alumina 99.5%)

Density gm/cc 3.90
Crystal Size (Average) Microns 6
Water absorption (open porosity) % 0
Gas permeability % 0
Color ¯ Ivory
Flexural Strength (MOR) 20°C MPa (psi x 103) 379 (55)
Elastic Modulus 20°C GPa (psi x 106)  370 (54)
Poisson’s Ratio 20°C ¯  0.22
Compressive Strength 20°C MPa (psi x 103)  2600 (377)
Hardness GPa (kg/mm2)  14.1 (1440)
R45N  83
Tensile Strength 25°C MPa (psi x 103)  262 (38)
Fracture Toughness K(I c) mpa m1/2  4-5
Thermal Conductivity 20°C W/m K 30.0
Coefficient of Thermal Expansion 25-1000°C X 10-6/°C 8.2
Specific Heat 100°C 880 J/kg*K 880
Thermal Shock Resistance   ΔTc  °C 200
 Maximum Use Temperature   °C  1750
Dielectric Strength 6.35mm ac-kV/mm (ac V/mil) 8.7 (220)
Dielectric Constant 1 MHz 25°C  9.7
Dielectric Loss (tan delta) 1 MHz 25°C  0.0001
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.

Material Properties (Alumina 96%)