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Ferro-Ceramic Grinding, Inc.

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Ceramic Properties - Boron Nitride

BN is made using a hot pressing process, and comes as a lubricious white solid. It can be machined using standard carbide drills. Due to crystal stucture, BN is anisotropic electrically and mechanically. BN exhibits a high electrical resistance, low dielectric constant and loss tangent, low thermal expansion, chemical inertness, and good thermal shock resistance in ceramic parts.

There are several different purity levels for this material. All offer very high thermal conductivity and stability in inert and reducing atmospheres up to 2800C, and in 850C in oxidizing environments.

Typical uses include vacuum components, low friction seals, various electronic parts, nuclear applications, and plasma arc insulators.

PropertiesUnitsTestValue
Physical
Chemical Formula BN
Density, rg/cm3ASTM C202.28
Color white
Crystal Structure hexagonal
Water Absorption% @R.T.ASTM C3730.0 - 1.0
HardnessMoh's 2
Hardnessknoop (kg/mm2)Knoop 100g25 - 205
Mechanical
Compressive StrengthMPa @ R.T.ASTM C77323.5
Tensile StrengthMPa @ R.T.ACMA Test #42.41 (1000 C)
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848675
Flexural Strength (MOR)MPa @ R.T.ASTM F41751.8
Poisson's Ratio, u ASTM C8180.05
Fracture Toughness, KIcMPa x m1/2Notched Beam Test2.6
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.985
Thermal Shock ResistanceDT (C)Quenching>1500
Thermal ConductivityW/m-K @ R.T.ASTM C40820
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3721.0 - 2.0
Specific Heat, cpcal/g-C @ R.T.ASTM C3510.19
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1504.08
Dielectric StrengthkV/mmASTM D116374
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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