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Elmet Technologies

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CoorsTek AD-85 Alumina (nom. 85% Al2O3)
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Thermal Shock Delta Tc = 300°C - Thermal shock tests are performed by quenching samples in water from different elevated temperatures. Delta Tc is the change in temperature which results in a sharp decrease in the flexural strength of the sample.

Data Provided by the manufacturer, Coors Ceramics Co.

Key Words: Al2O3; aluminum oxide, alumina
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Physical PropertiesOriginal ValueComments
Density 3.42 g/ccASTM C20
Water Absorption 0.00 %ASTM C373
Particle Size 6.0 µmAverage Crystal Size - Thin Section Test
 
Mechanical PropertiesOriginal ValueComments
Knoop Microhardness 9.41000 g load
Hardness, Rockwell 45 N 73GPa
Tensile Strength, Ultimate 155 MPaACMA Test #4
Modulus of Elasticity 221 GPaASTM C848
Flexural Strength 296 MPaASTM F417
Compressive Strength 1930 MPaASTM C773
Poissons Ratio 0.22ASTM C848
Fracture Toughness 3.00 - 4.00 MPa-m½Notched Beam
Shear Modulus 91.0 GPaCalculated
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity >= 1.00e+14 ohm-cmASTM D1829
 4.00e+8 ohm-cm
@Temperature 500 °C
ASTM D1829
Dielectric Constant 8.2
@Frequency 1e+6 Hz
Dielectric Strength 9.40 kV/mmac; ASTM D116
Dielectric Loss Index 0.00090
@Frequency 1e+6 Hz
ASTM D2520
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.20 µm/m-°C
@Temperature 25.0 - 1000 °C
ASTM C372
Specific Heat Capacity 0.920 J/g-°CASTM E1269
Thermal Conductivity 16.0 W/m-KASTM C408
Maximum Service Temperature, Air 1400 °CNo Load
 
Component Elements PropertiesOriginal ValueComments
Al2O3 85 %
 
Descriptive Properties
ColorWhite

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CA7A / 376

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