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Ozark TechnicalCeramics, Inc.

High Density, Fine Grained Crucibles - 61657 OTC

Ozark TechnicalCeramics, Inc.

Tech Data Sheet CD3 / (B9) - Oxide Properties

PHYSICAL CHARACTERISTICS OF SELECTED OXIDES

The following data is compiled from published technical references. Most information is notderived from measurements made on OZARK TECHNICAL CERAMICS materials. Al
2 O
3 MgO HfO
2 Basic Properties Crystal Structure hexagonal cubic monoclinic* Melting Point (C) 2050 2825 2830 Theoretical Density (g/cc) 3.98 3.58 9.68
*tetragonal above 1650 C Mechanical Properties Hardness (Moh)
2 95.5 -- Microhardness (kg/mm ) 20008001100 Bend Strength, 25 C (psi) 80,00035,000 -- Compressive Strength, 25 C (psi) 400,000120,000 -- Thermal Properties Coefficient of Thermal Expansion
6 7.913.95.8 (in/in- C x 10 )Specific Heat, 70 F (Btu lb-1F-1) .20.22.09 Thermal Conductivity (w/cm- C) 20 C .360.480.045 800 C .071.085.026Electrical Properties Electrical Conductivity (ohm
-1 cm
-1 )25 C 10
-12 -10 10
-12 -10 10
-10 400 C 10
-7 10
-7 10
-8 800 C 10
-5.5 10
-5.5 10
-6 1000 C 10
-3.5 10
-3.5 10
-4.5 1500 C 10 10 10
-3 Dielectric strength (kV/ cm) 200150 ----Dielectric constant 12.79.6(18-45) References:
1) Metals and Ceramics Information Center, "Engineering Property Data on Selected Ceramics, VolumeIII", July 19812) Bauer and Bates, "An Evaluation of Electrical Insulators for Fusion Reactors" 3) S.C. Meyers, "Selection and Conceptual design of High Temperature In-Fuel Thermocouples for theHEDL SLSF W-1 Test", April 1977 Ozark Technical Ceramics, Inc. 402 Ware St. Webb City, MO 64870-2789 Tel. (417) 673-2463 / FAX (417) 673-2464 / website:
www.ozarktech.com E12 - Aug-01