CoorsTek AD-998 Alumina(nom. 99.8% Al 2 O 3 )

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CoorsTek AD-998 Alumina(nom. 99.8% Al₂O₃)
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Thermal Shock Delta T_c = 200°C - Thermal shock tests are performed by quenching samples in water from different elevated temperatures. Delta T_c 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 Properties	Metric	English	Comments

Density	3.92 g/cc	0.142 lb/in³	ASTM C20
Water Absorption	0.00 %	0.00 %	ASTM C373
Particle Size	6.0 µm	6.0 µm	Average Crystal Size - Thin Section Test

Mechanical Properties	Metric	English	Comments
Knoop Microhardness	14.1	14.1	1000 g load
Hardness, Rockwell 45 N	83	83	GPa
Tensile Strength, Ultimate	248 MPa	36000 psi	ACMA Test #4
Modulus of Elasticity	370 GPa	53700 ksi	ASTM C848
Flexural Strength	375 MPa	54400 psi	ASTM F417
Compressive Strength	2500 MPa	363000 psi	ASTM C773
Poissons Ratio	0.22	0.22	ASTM C848
Fracture Toughness	4.00 - 5.00 MPa-m½	3.64 - 4.55 ksi-in½
Shear Modulus	152 GPa	22000 ksi	Calculated

Electrical Properties	Metric	English	Comments
Electrical Resistivity	>= 1.00e+14 ohm-cm	>= 1.00e+14 ohm-cm	ASTM D1829
	5.00e+7 ohm-cm @Temperature 1000 °C	5.00e+7 ohm-cm @Temperature 1830 °F	ASTM D1829
	2.00e+10 ohm-cm @Temperature 500 °C	2.00e+10 ohm-cm @Temperature 932 °F	ASTM D1829
Dielectric Constant	9.8 @Frequency 1e+6 Hz	9.8 @Frequency 1e+6 Hz
Dielectric Strength	8.70 kV/mm	221 kV/in	ac; ASTM D116
Dielectric Loss Index	0.0010 @Frequency 1e+6 Hz	0.0010 @Frequency 1e+6 Hz	ASTM D2520

Thermal Properties	Metric	English	Comments
CTE, linear	8.20 µm/m-°C @Temperature 25.0 - 1000 °C	4.56 µin/in-°F @Temperature 77.0 - 1830 °F	ASTM C372
Specific Heat Capacity	0.880 J/g-°C	0.210 BTU/lb-°F	ASTM E1269
Thermal Conductivity	30.0 W/m-K	208 BTU-in/hr-ft²-°F	ASTM C408
Maximum Service Temperature, Air	1750 °C	3180 °F	No Load

Component Elements Properties	Metric	English	Comments
Al2O3	99.8 %	99.8 %

Descriptive Properties
Color	Ivory

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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