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Ferro-Ceramic Grinding, Inc.

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Ceramic Properties - Aluminum Nitride

While AlN is not a 'new' material for ceramic parts, recent manufacturability developments over the past 15 years have made this an exciting and viable ceramic design material.

One of the most useful applications AlN has found is in replacing beryllium oxide (BeO) in the semiconductor industry. This substitution is due to BeO's toxicity. The thermal expansion coefficient of AlN is lower than BeO or alumina, and closely matches that of the silicon wafers used in electronics. Once a limitation for AlN's use in electronic applications there are now processes to metallize AlN.

There are electronic and structural grades of this material, classified as such by the thermal conductivity, which is controlled by the purity of the AlN. Pristine material is White, high purity is tan, and grey color indicates contaminants.

PropertiesUnitsTestValue
Physical
Chemical Formula AlN
Density, rg/cm3ASTM C203.25
Color white/tan/grey
Crystal Structure hexagonal
Water Absorption% @R.T.ASTM C3730.0
HardnessMoh's 5
Hardnessknoop (kg/mm2)Knoop 100g1170
Mechanical
Compressive StrengthMPa @ R.T.ASTM C7732068
Tensile StrengthMPa @ R.T.ACMA Test #4--
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848308
Flexural Strength (MOR)MPa @ R.T.ASTM F417428
Poisson's Ratio, u ASTM C8180.25
Fracture Toughness, KIcMPa x m1/2Notched Beam Test3.5
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.1600
Thermal Shock ResistanceDT (C)Quenching400
Thermal ConductivityW/m-K @ R.T.ASTM C40882.3 - 170
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3724.6 - 5.7
Specific Heat, cpcal/g-C @ R.T.ASTM C3510.25
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1508.0 - 9.1
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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