Note: This is a variation of Dense Ceramics – Alumina, Mullite, & Zirconia (3200ºF – 3600ºF Range).
Fully Dense Porcelain, Mullite, Alumina, Zirconia, Silicon Carbide, and Tungsten Carbide are gas-tight high-fired ceramics capable of withstanding operating temperatures of 2550ºF (1400ºC) to 3182ºF (1750ºC). These compositions are available in the forms of extruded and cast tubing, rods, plates, fish spine beads, lab ware, and custom molded shapes.
Specifications
| Composition | Nom. 85% Al2O3 |
|---|---|
| Density ( g cc ) | 3.42 |
| Average Crystal Size ( Microns ) | 6 |
| Gas Permeability | 0 |
| Color | White |
| Flexural Strength (MOR) at 20ºC ( MPa ) | 296 |
| Flexural Strength (MOR) at 20ºC ( psi ) | 43 x 103 |
| Elastic Modulus at 20ºC ( psi ) | 32 x 103 |
| Elastic Modulus at 20ºC ( GPa ) | 221 |
| Poisson's Ratio at 20ºC | 0.22 |
| Compressive Strength at 20ºC ( MPa ) | 1930 |
| Compressive Strength at 20ºC ( psi ) | 280 |
| Knoop Hardness at 1000gm ( kg mm² ) | 960 |
| Knoop Hardness at 1000gm ( GPa ) | 9.4 |
| Rockwell Hardness at 45 N | 73 |
| Tensile Strength at 25ºC ( MPa ) | 155 |
| Tensile Strength at 25ºC ( psi ) | 22 x 103 |
| Fracture Toughness K(Ic) | 3 to 4 MPa m1/2 |
| Thermal Conductivity at 20ºC ( W m-ºK ) | 16.0 |
| Coefficient of Thermal Expansion at 25-1000ºC ( Per ºC ) | 7.2 x 10-6 |
| Specific Heat at 100ºC ( J kgºK ) | 920 |
| Thermal Shock Resistance ΔTc ( ºC ) | 300 |
| Maximum Use Temperature ( ºC ) | 1400 |
| Dielectric Strength ( ac-kV mm ) | 9.4 |
| Dielectric Strength ( ac V mil ) | 240 |
| Dielectric Constant at 1 MHz & 25ºC | 8.2 |
| Dielectric Loss (tan delta) at 1 MHz & 25ºC | 0.0009 |
| Volume Resistivity at 25ºC ( ohm-cm ) | >1014 |
| Volume Resistivity at 500ºC ( ohm-cm ) | 4 x 108 |
| Impingement | 1.00 |
| Rubbing | 1.00 |
| Water Absorption ( % ) | 0 |
| Material | Alumina |