This technical information has been contributed by
Ferro-Ceramic Grinding, Inc.

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Ceramic Properties - Alumina 99.5%

Alumina represents the most commonly utilized ceramic material in industry. Purity levels are available from 85% through 99.9%. This is because of extremely superior abrasion, high temperature and chemical resistance. It is electrically insulating as well. This material has an excellent cost to part life performance record for ceramic parts.

Applications include wear and heat resistant liners, mechanical and pump seals, nozzles, semiconductor equipment components, insulators, etc.

PropertiesUnitsTestValue
Physical
Chemical Formula Al2O3
Density, rg/cm3ASTM C203.7 - 3.97
Color ivory/white
Crystal Structure hexagonal
Water Absorption% @ R.T.ASTM C3730.0
HardnessMoh's 9
Hardnessknoop (kg/mm2)Knoop 100g2000
Mechanical
Compressive StrengthMPa @ R.T.ASTM C7732070 - 2620
Tensile StrengthMPa @ R.T.ACMA Test #4260-300
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848393
Flexural Strength (MOR)MPa @ R.T.ASTM F417310 - 379
Poisson's Ratio, u ASTM C8180.27
Fracture Toughness, KIcMPa x m1/2Notched Beam Test4.5
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.1750
Thermal Shock ResistanceDT (C)Quenching200
Thermal ConductivityW/m-K @ R.T.ASTM C40835
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3728.4
Specific Heat, cpcal/g-C @ R.T.ASTM C3510.21
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1509.6
Dielectric StrengthkV/mmASTM D11615
Electrical ResistivityWcm @ R.T.ASTM D1829>1014

This technical information has been contributed by
Ferro-Ceramic Grinding, Inc.

Click here to find suppliers

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