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Elmet Technologies

CeramTec 771 94% Alumina (Al2O3)
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Te value is 840°C. Hasselman Thermal Shock value is 200 K.

Data provided by CeramTec North America.

Key Words: Al2O3; Aluminum Oxide
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Physical PropertiesMetricEnglishComments
Density 3.60 g/cc0.130 lb/in³
Water Absorption 0.00 %0.00 %
 
Mechanical PropertiesMetricEnglishComments
Vickers Microhardness 12001200HV 0.5
Tensile Strength, Ultimate 138 MPa20000 psiACMA Test #4
Modulus of Elasticity 281 GPa40800 ksiUltrasonic
Flexural Strength 262 MPa38000 psi20 x 40 mm
Compressive Strength 1931 MPa280100 psiASTM C773-88
Poissons Ratio 0.240.24ASTM C-1 259-94
Fracture Toughness 2.70 MPa-m½2.46 ksi-in½
Shear Modulus 113 GPa16400 ksiUltrasonic
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity  7.00e+6 ohm-cm
@Temperature 700 °C
7.00e+6 ohm-cm
@Temperature 1290 °F
 >= 1.00e+14 ohm-cm
@Temperature 25.0 °C
>= 1.00e+14 ohm-cm
@Temperature 77.0 °F
Dielectric Constant 8.9
@Frequency 1e+6 Hz
8.9
@Frequency 1e+6 Hz
Dielectric Strength 8.268 kV/mm
@Thickness 6.35 mm
210.0 kV/in
@Thickness 0.250 in
Dissipation Factor  0.00030
@Frequency 1e+6 Hz
0.00030
@Frequency 1e+6 Hz
 0.0010
@Frequency 1e+10 Hz
0.0010
@Frequency 1e+10 Hz
Dielectric Loss Index 0.0027
@Frequency 1e+6 Hz
0.0027
@Frequency 1e+6 Hz
 
Thermal PropertiesMetricEnglishComments
CTE, linear  6.00 µm/m-°C
@Temperature 25.0 - 300 °C
3.33 µin/in-°F
@Temperature 77.0 - 572 °F
 7.20 µm/m-°C
@Temperature 25.0 - 700 °C
4.00 µin/in-°F
@Temperature 77.0 - 1290 °F
 7.40 µm/m-°C
@Temperature 25.0 - 1001 °C
4.11 µin/in-°F
@Temperature 77.0 - 1834 °F
Specific Heat Capacity 0.900 J/g-°C0.215 BTU/lb-°F
Thermal Conductivity 27.7 W/m-K192 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 1500 °C2730 °F
 
Component Elements PropertiesMetricEnglishComments
Al2O3 94 %94 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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