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Chemically Resistant adhesives

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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 PropertiesOriginal ValueComments
Density 1.95 - 2.22 g/ccApparent Density
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength, Ultimate 40.0 MPa
@Temperature 23.0 °C
 103 MPa
@Temperature 2200 °C
Modulus of Elasticity 22.0 GPaYoung's modulus
Flexural Strength 80.0 MPa
Compressive Strength 234 MPa
Poissons Ratio 0.25
Shear Modulus 8.80 GPaCalculated
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 1.00e+15 ohm-cm
Dielectric Constant 3.4"c" direction
 5.2"ab" direction
Dielectric Strength 200 kV/mmD.C.
Dissipation Factor 0.0020
@Frequency 4.00e+9 Hz
 
Thermal PropertiesOriginal ValueComments
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-Kin "c" direction
 60.0 W/m-Kin "ab" direction
Maximum Service Temperature, Air 750 °Cindefinite exposure to oxygen
Maximum Service Temperature, Inert 2500 °C
 
Optical PropertiesOriginal ValueComments
Emissivity (0-1) 0.50
@Temperature 1300 °C
lower than graphite

**
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