Mullite

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

Composition2SiO2
3Al2O3
Density ( g/cc )2.80
Average Crystal Size ( Microns )10
Gas Permeability0
ColorTan
Flexural Strength (MOR) at 20ºC ( MPa )170
Flexural Strength (MOR) at 20ºC ( psi )25 x 103
Elastic Modulus at 20ºC ( psi )22 x 103
Elastic Modulus at 20ºC ( GPa )150
Compressive Strength at 20ºC ( MPa )550
Compressive Strength at 20ºC ( psi )80
Knoop Hardness at 1000gm ( kg/mm² )750
Knoop Hardness at 1000gm ( GPa )7.4
Rockwell Hardness at 45 N70
Fracture Toughness K(Ic)2 MPa m1/2
Thermal Conductivity at 20ºC ( W/m-ºK )3.5
Coefficient of Thermal Expansion at 25-1000ºC ( Per ºC )5.3 x 10-6
Specific Heat at 100ºC ( J/kgºK )950
Thermal Shock Resistance ΔTc ( ºC )300
Maximum Use Temperature ( ºC )1700
Dielectric Strength ( ac-kV/mm )9.8
Dielectric Strength ( ac V/mil )248
Dielectric Constant at 1 MHz & 25ºC6.0
Dielectric Loss (tan delta) at 1 MHz & 25ºC0.0020
Volume Resistivity at 25ºC ( ohm-cm )>1014
Volume Resistivity at 500ºC ( ohm-cm )5 x 1012
Volume Resistivity at 1000ºC ( ohm-cm )3 x 105
Water Absorption ( % )0
MaterialAlumina
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