Momentive Performance Materials Boralloy® PBN Pyrolytic Boron Nitride

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Momentive Performance Materials Boralloy® PBN Pyrolytic Boron Nitride (discontinued **)
Categories:	Ceramic; Nitride
Material Notes:	Boralloy® Pyrolytic Boron Nitride (PBN) is an anisotropic, high-temperature ceramic which exhibits a unique combination of high electrical resistance and good thermal conductivity. This non-toxic, non-porous compound is exceptionally pure by virtue of the synthesis process (high temperature/low pressure chemical vapor deposition). It can be deposited or easily machined into a limitless number of shapes, including: crucibles, tubes, machined plate products, boats, and bottles. PBN's directional thermal conductivity provides excellent "heat spreading" capability for improved temperature uniformity. The combination of high strength, good thermal conductivity, and a low coefficient of thermal expansion make the material extremely resistant to thermal shock. PBN has found wide acceptance in the semiconductor, electronics, metallurgical, thin film, and pharmaceutical industries. Information provided by Momentive Performance Materials, formerly GE Advanced Ceramics.
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Physical Properties	Original Value	Comments

Density	1.95 - 2.22 g/cc	Apparent Density

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	40.0 MPa @Temperature 23.0 °C
	103 MPa @Temperature 2200 °C
Modulus of Elasticity	22.0 GPa	Young's modulus
Flexural Strength	80.0 MPa
Compressive Strength	234 MPa
Poissons Ratio	0.25
Shear Modulus	8.80 GPa	Calculated

Electrical Properties	Original Value	Comments
Electrical Resistivity	1.00e+15 ohm-cm
Dielectric Constant	3.4	"c" direction
	5.2	"ab" direction
Dielectric Strength	200 kV/mm	D.C.
Dissipation Factor	0.0020 @Frequency 4.00e+9 Hz

Thermal Properties	Original Value	Comments
CTE, linear	-2.00 µm/m-°C @Temperature 0.000 - 250 °C	average, in "a" direction
	2.00 µm/m-°C @Temperature 1000 °C	"ab" direction
	40.0 µm/m-°C @Temperature 0.000 - 250 °C	average, in "c" direction
Thermal Conductivity	2.00 W/m-K	in "c" direction
	60.0 W/m-K	in "ab" direction
Maximum Service Temperature, Air	750 °C	indefinite exposure to oxygen
Maximum Service Temperature, Inert	2500 °C

Optical Properties	Original Value	Comments
Emissivity (0-1)	0.50 @Temperature 1300 °C	lower than graphite

**
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