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Rulon Bearings

CoorsTek Mullite, S2
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: Coors Mullite, 3Al2O3.2SiO2, S2
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Physical PropertiesMetricEnglishComments
Density 2.80 g/cc0.101 lb/in³ASTM C20
Water Absorption 0.00 %0.00 %ASTM C373
Particle Size 10 µm10 µmAverage Crystal Size - Thin Section Test
 
Mechanical PropertiesMetricEnglishComments
Knoop Microhardness 7.47.41000 g load
Hardness, Rockwell 45 N 7070GPa
Modulus of Elasticity 150 GPa21800 ksiASTM C848
Flexural Strength 170 MPa24700 psiASTM F417
Compressive Strength 550 MPa79800 psiASTM C773
Poissons Ratio 0.250.25ASTM C848
Fracture Toughness 2.00 MPa-m½1.82 ksi-in½Notched Beam
Shear Modulus 60.0 GPa8700 ksiCalculated
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity >= 1.00e+13 ohm-cm>= 1.00e+13 ohm-cmASTM D1829
 300000 ohm-cm
@Temperature 1000 °C
300000 ohm-cm
@Temperature 1830 °F
ASTM D1829
 5.00e+12 ohm-cm
@Temperature 500 °C
5.00e+12 ohm-cm
@Temperature 932 °F
ASTM D1829
Dielectric Constant 6.0
@Frequency 1e+6 Hz
6.0
@Frequency 1e+6 Hz
Dielectric Strength 9.80 kV/mm249 kV/inac; ASTM D116
Dielectric Loss Index 0.0020
@Frequency 1e+6 Hz
0.0020
@Frequency 1e+6 Hz
ASTM D2520
 
Thermal PropertiesMetricEnglishComments
CTE, linear 5.30 µm/m-°C
@Temperature 25.0 - 1000 °C
2.94 µin/in-°F
@Temperature 77.0 - 1830 °F
ASTM C372
Specific Heat Capacity 0.950 J/g-°C0.227 BTU/lb-°FASTM E1269
Thermal Conductivity 3.50 W/m-K24.3 BTU-in/hr-ft²-°FASTM C408
Maximum Service Temperature, Air 1700 °C3090 °FNo Load
 
Descriptive Properties
ColorTan

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