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

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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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