Alumina (Al2O3) - Physical and Mechanical Properties of Aluminium Oxide Ceramics by Superior Technical Ceramics

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Background
Physical and Mechanical Properties of Alumina Ceramics

Background

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Physical and Mechanical Properties of Alumina Ceramics

The physical and mechanical properties of alumina ceramics from Superior Technical Ceramics are listed below:

Property ASTM Method Designation Dense AL-95 Dense AL-96 Dense AL-98 Dense AL-99.5 Dense AL-99.8
% Alumina - % Al2O3 94.8 96.0 97.6 99.599.6
Color - Cream White White Cream - WhiteCream
Gas/Liquid Permeability F134B Atm-cc/sec None None None None None
Density C 20-97 g/cc 3.65 3.68 3.83 3.90 3.91
Hardness - Mohs Scale 9 9 9 9 9
Water Absorption C 20-97 % 0 0 0 0 0
Flexural Strength F417-87 PSI 45,000 48,000 60,000 55,000 50,000
Tensile Strength - PSI 20,000 19,000 22,000 25,000 25,000
Compressive Strength - PSI 300,000 330,000 350,000 375,000 375,000
Elastic Modulus C848 PSI x106 44 45 51 54 54
Shear Modulus C848 PSI x106 17 18 20 21 21
Linear Coefficient of Thermal Expansion: C372-96 (@25°C-100°C) x10-6/°C 5.0 6.0 6.2 7.3 6.6
- (@25°C-300°C) x10-6/°C 6.6 6.8 6.7 6.4 6.9
- (@25°C-600°C) x10-6/°C 7.6 7.7 7.5 7.2 7.6
Thermal Conductivity 25°C C 408 W/m-K 22 23 27 31 30
Maximum Use Temperature (Non Loading) - °C 1650 1700 1700 1675 1675
- °F 3000 3100 3100 3050 3050
Dielectric Strength (1/8" thick) D149-97A V/mil 250 260 270 270 245
Dielectric Constant @ 1MHz D150-98 At 25°C 9.2 9.2 9.5 9.8 10.1
Dielectric Constant (@GHz) D2520-95 At 25°C 9.0 (@10.6) 8.8 (@10.4) 9.7 (@7.0) 9.7 (@9.9) 10.0 (@7.3)
Dielectric Loss @ 1MHz D150-98 At 25°C 0.0003 0.0005 0.0004 0.0001 0.023
Dielectric Loss (@GHz) D2520-95 At 25°C 0.0008 (@10.6) 0.0007 (@10.4) 0.0005 (@7.0) 0.0001 (@9.9) 0.003 (@7.3)
Volume Resistivity (ohm-cm) D 257 At 25°C >1.0E + 15 >1.0E + 15 >1.0E + 15 >1.0E + 15 >1.0E + 15
- At 300°C 1.3E + 14 2.3E + 14 2.0E + 14 4.0E + 13 7.9E + 12
- At 700°C 2.5E + 09 7.1E + 09 8.1E + 09 5.1E + 09 7.7E + 09

Source: Superior Technical Ceramics

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Date Added: Oct 15, 2010
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