Material Properties - Alumina (A998) & Zirconia (TZP)

Property Unit A998 TZP
Physical Properties
Com­posi­tion ¹ weight % 99.8 Al2O3 5.4 Y2O3
Density ² g/cm3 3.89 6.0
Porosity volume % Impervious Impervious
Color   Ivory Off-white
Mechanical Properties
Hardness (Knoop) GPa 11.1 11.7
4-point Bend ³ Strength (MOR) MPa (ksi) 325 (47) 600 (87)
Thermal Properties
Maxi­mum Service Tempera­ture °C 1650 2200
Thermal Expan­sion Coeffi­cient °C-1 (25-700°C) 7.5 x 10-6 11.2 x 10-6
Thermal Conduc­tivity (20°C) W/m·°K (Btu·in/ft2 ·hr·°F) 35 (242) 2 (14)
Electrical Properties
Dielectric Strength Volts/mil 200 51
Dielectric Constant @1MHz @ 20°C 10.0 28.0
Volume Resistivity Ohm·cm @ 25°C
14
>1013
Ohm·cm @ 300°C 2.5 x 1011 n/a
Ohm·cm @ 500°C 5.5 x 108 48 x 103

Material Properties Notes

1. Controlled by the Batch Composition

2. Measured by Pychnometer Immersion Technique

3. per ASTM C 1161-02c.

Heat Resistant Corrosion Resistant Non-conductive Non Out-Gassing

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