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AD-85 Alumina Material Properties
| Trade
Name |
AD-85 |
| Composition |
Nominal 85% Al2O3 |
| Color |
White |
| Property |
Units |
Test |
Value |
| Density |
gm/cc |
ASTM-C20 |
3.42 |
| Crystal Size |
Microns |
Thin-Section |
6 |
| Water Absorption |
% |
ASTM-373 |
0 |
| Gas Permeability |
|
|
0 |
| Flexural Strength (MOR), 20 degrees C |
-- |
-- |
296 (43) |
| Elastic Modulus, 20 degrees C |
GPa (psi x 106) |
ASTM-F417 |
221 (32) |
| Poisson's Ratio, 20 degrees C |
-- |
ASTM-C848 |
0.22 |
| Compressive Strength |
MPa(psi x 103) |
ASTM-C773 |
1930 (280) |
| Hardness |
GPa(kg/mm2) |
KNOOP 1000 gm |
9.4 (960) |
| |
|
Rockwell 45 N |
73 |
| Tensile Strength, 25 degrees C |
MPa (psi x 103) |
ACMA TEST #4 |
155 (22) |
| Fracture Toughness K(Ic) |
Mpa m1/2 |
NOTCHED BEAM |
3-4 |
| Thermal Conductivity, 20 degrees C |
Wm degrees K |
ASTM-C408 |
16 |
| Coefficient of Thermal Expansion, 25-1000 degrees C |
1 x 10-6/degrees C |
ASTM-C372 |
7.2 |
| Specific Heat, 100 degrees C |
J/kg*K |
ASTM-E1269 |
920 |
| Thermal Shock Resistance, (delta)Tc |
degrees C |
NOTE 3 |
300 |
| Maximum Use Temperature |
degrees C |
NO-LOAD COND. |
1400 |
| Dielectric Strength |
ac-kV/mm (acV/mil) |
ASTM-D116 |
9.4 (240) |
| Dielectric Constant, 1MHz |
25 degrees C |
ASTM-D150 |
8.2 |
| Dielectric Loss (tan delta) 1MHz |
25 degrees C |
ASTM-D2520 |
0.0009 |
| Volume Resistivity |
25 degrees C |
ohm-cm |
ASTM-D1829 |
>1014 |
|
500 degrees C |
ohm-cm |
ASTM-D1829 |
4 x 108 |
|
1000 degrees C |
ohm-cm |
ASTM-D1829 |
-- |
| Impingement |
-- |
Note 4 |
1.00 |
| Rubbing |
-- |
Note 4 |
1.00 |
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Engineering data is representative. Property values vary somewhat with method of
manufacture, size, and shape of part. Any suggested applications are not made as a representation
or warranty that the material will ultimately be suitable for such applications. The customer is
ultimately responsible for all design and material suitability decisions. Data contained herein is
not to be construed as absolute and does not constitute a representation or warranty for which
CoorsTek assumes legal responsibility. Any warranty or representation for which CoorsTek is
responsible shall be subject to a separately negotiated agreement.
Note 1: Data Measurements -- All data measurements are typical and made at room temperature unless otherwise noted.
Note 2: Composition Control -- All CoorsTek ceramic compositions are controlled using modern chemical spectrographic and x-ray fluorescent methods.
Note 3: Thermal shock resistance -- Test are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as (delta)Tc.
Note 4: Wear resistance -- Impingement tests are run by using a dry 240 grit fused alumina abrasive. The indices in the chart are calculated by dividing the material volume loss by the volume loss of an AD-85 alumina control. The lower in the index, the better the wear resistance.
*Ceramic property values vary somewhat with method of manufacture, size, and shape of part. Close control of values of most properties can be maintained if specified.
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