Pyrolytic boron nitride plates, boats, crucibles, tubes, heaters and coatings.

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Contact Details

 
Ceramisis Ltd
16, Ivyhouse Lane, Hastings, East Sussex, TN35 4NN England
 
Telephone:
+44 020 7927 6710
Fax:
+44 020 7637 0419
E-mail:
sales@ceramisis.com
 
 
 
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MacorShapalBoron NitridePyrolytic BNOxidesNitridesCarbides

Pyrolytic Boron Nitride (PBN)

 

PBN is produced by depositing onto machined graphite mandrels at temperatures in excess of 1800°C. The deposit forms on the mandrel as a coating which, upon cooling, can be separated from the mandrel to form a free-standing shape. The PBN is then machined to the customer’s specification, and cleaned and packed ready for use. CVD is a versatile technology that can allow many different free­standing shapes to be manufac­tured, as well as coatings on a variety of different substrate materials.

PBN products are well suited for use in Molecular Beam Epitaxy, Metal Organic Chemical Vapour Deposition (MOCVD), Crystal Growth and other applications, where high purity and chemical stability are required.

Flat and tubular heater elements can be produced by depositing a conducting layer of Pyrolytic Graphite (PG) onto an insulating substrate of PBN. A track can then be machined in the PG layer which can then be protected by an over-coat layer of PBN. These heaters have a very fast response and a low thermal mass. They are ideally suited for use in Ultra High Vacuum, or corrosive chemical environments. Ceramisis are specialists in heater and stage designs for vacuum systems.

Typical Properties (Room Temperature)

Physical Property

Unit

Orientation

Value

Density

g/cm³

=

2.0 - 2.10

Flexural Strength

MPa

=

80

Tensile Strength

MPa

=

40

Compressive Strength

MPa

=

100

Thermal Expansion 20-1000C

/K

=

^

3.1 x 10E-6

36 x 10E-6

Dielectric Strength (RT)

V/mm

=

2 x 10E5

Loss Tangent (4GHz)

tanδ

=

^

2 x 10E-4

5 x 10E-5

Decomposition Temp

°C

 

2800

Purity

%

 

B + N>99.995


 

 

 

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