Ceramic Substrates and Components Ltd

Machinable Ceramics

Boron Nitride

Boron Nitride is a synthetic technical ceramic material, which is available in powder, solid, aerosol and liquid forms. In solid form it can be machined easily with ordinary metalworking tools. Boron Nitride has out-standing thermal characteristics; high thermal conductivity and excellent thermal shock resistance. Boron Nitride in solid form is available in 3 grades, each having different characteristics

HPBN most common grade is manufactured by hot pressing. Its crystal structure is hexagonal. Due to the uniaxial densification method, the anisotropy of HPBN platelet structure is created. As a result of the anisotropy, different physical properties occur, parallel or perpendicular to the pressing direction. HPBN is non toxic and can be easily machined.

Applications	Properties	Chemical Composition
Electrical insulators for high temperature applications	Excellent thermal shock behaviour	Boron Nitrogen Oxygen	40-42.6% 49-52.9% 3-5%
Thermocouple tubes	High electrical resistivity	Calcium SiO2	2-3% 0.2%
Crucibles and nozzels for molten metals	Chemically stable	B203 Others	0.4 0.03%
Rolls and support elements in the glass manufacturing industries	Extraordinary thermo cycling properties
	High temperature material

Standard shapes and maximum dimensions:

• HPBN is hot pressed in block shapes up to 280mm diameter and 300mm height.
• We will be pleased to offer made to order parts to your drawings and requirements.

Physical Properties of hot pressed Boron Nitride:

Pressing Direction			Parallel	Perpendicular
Compressive Strength		Mpa	30	48
Young’s modulus	RT	Gpa	34.1	75.2
Flexural Strength	RT	Mpa	43.7	60.2
	1000°C		12.5	17.4
	1500°C		11.8	17.0
Density		g/cm³	1.9-1.95	1.9-1.95
Vickers Hardness		kg/mm²	12.01	10.88
Thermal Expansion	RT-350°C	x10-6K-1	0.0	0.0
	RT-700°C		0.67	0.0
	RT-1500°C		2.95	0.87
Thermal Conductivity	RT	W/mK	27.22	30.98
	300°C		23.03	27.22
	500°C		21.77	26.38
	1000°C		20.52	25.54
Max usage temperature Inert atmosphere		°C	1500	1500
Oxide atmosphere			850	850
Volume resistivity		Wcm
	RT		1.7x1014	4.0x1014
	150°C		1.7x1014	1.9x1014
Dielectric Strength		KV/mm	>39.4	>39.4

INTRICATE MACHINING

Here at Ceramic Substrates & Components Limited with our generations of experience in the precision ceramic industry, we have developed some unique techniques and cutters which enable us to machine incredibly fine and intricate tiny components, complementing the more industrial and commercial sized components.

Many Government organisations along with Scientific and Research Institutes and Universities worldwide use our facilities manned by highly skilled Engineers to fulfil many of their requirements, along with customers ranging from F1 and Super cars through to Aerospace.

We pride ourselves not only on our supreme quality but also our impressive long standing customer base.

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Ceramic Substrates and Components Ltd
Lukely Works, Carisbrooke Road, Newport, Isle of Wight, United Kingdom. PO30 1DH - Company Registration No.934853
Tel: +44 (0)1983 528697 - Fax: +44 (0)1983 822252 - Email: info@ceramic-substrates.co.uk

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