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Item # Mullite, 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  · Mechanical Properties  · Thermal Properties  · Electrical Properties

Specifications

Material

Alumina


Mechanical Properties

Density

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2.80 g/cc

Average Crystal Size

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10 Microns

Water Absorption

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0 %

Gas Permeability

0

Color

Tan

Flexural Strength (MOR) at 20ºC

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170 MPa
25 x 103
psi

Elastic Modulus at 20ºC

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150 GPa
22 x 103
psi

Compressive Strength at 20ºC

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550 MPa
80
psi

Knoop Hardness at 1000gm

7.4 GPa
750
kg/mm²

Rockwell Hardness at 45 N

70

Fracture Toughness K(Ic)

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2 MPa m1/2


Thermal Properties

Thermal Conductivity at 20ºC

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3.5 W/m-ºK

Coefficient of Thermal Expansion at 25-1000ºC

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5.3 x 10-6 Per ºC

Specific Heat at 100ºC

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950 J/kgºK

Thermal Shock Resistance ΔTc

300 ºC

Maximum Use Temperature

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1700 ºC


Electrical Properties

Dielectric Strength

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9.8 ac-kV/mm
248
ac V/mil

Dielectric Constant at 1 MHz & 25ºC

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6.0

Dielectric Loss (tan delta) at 1 MHz & 25ºC

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0.0020

Volume Resistivity at 25ºC

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>1014 ohm-cm

Volume Resistivity at 500ºC

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5 x 1012 ohm-cm

Volume Resistivity at 1000ºC

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3 x 105 ohm-cm


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