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Ferro-Ceramic Grinding, Inc.

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Ceramic Properties - Silicon Nitride

Silicon Nitride has the strongest covalent bond properties next to silicon carbide. It is used as a high temperature structural ceramic due to superior heat resistance, strength, and hardness. The wear and corrosion resistance are excellent. There are various types available (Sintered, CVD, HP) for different purposes using ceramic parts.

Main applications include heat exchangers, rotors, nozzles, bearings, valves, chemical plant parts, engine components, and armor.

PropertiesUnitsTestValue
Physical
Chemical FormulaSi3N4
Density, rg/cm3ASTM C203.31
Colordark gray
Crystal Structure

hexagonal (alpha & beta)

Water Absorption% @R.T.ASTM C3730.0
HardnessMoh's9
Hardnessknoop (kg/mm2)Knoop 100g2200
Mechanical
Compressive StrengthMPa @ R.T.ASTM C773689-2760
Tensile StrengthMPa @ R.T.ACMA Test #4360-434
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848317
Flexural Strength (MOR)MPa @ R.T.ASTM F417679-896
Poisson's Ratio, uASTM C8180.23
Fracture Toughness, KIcMPa x m1/2Notched Beam Test5.0-8.0
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.1500
Thermal Shock ResistanceDT (C)Quenching750
Thermal ConductivityW/m-K @ R.T.ASTM C40827
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3723.4
Specific Heat, cpcal/g-C @ R.T.ASTM C3510.17
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1507.0
Dielectric StrengthkV/mmASTM D11617.7
Electrical ResistivityWcm @ R.T.ASTM D18291013

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

Click here to find suppliers

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