Boron Nitride is a synthetic technical ceramic material. It has out-standing thermal characteristics; high thermal conductivity and excellent thermal shock resistance and is stable in inert and reducing atmospheres up to 2000 C, and in oxidizing atmospheres to 900 C. The special property of Boron Nitride is that it is un-wetting with molten metal.  In its solid form, Boron Nitride can easily be machined to close tolerances in virtually any shape. After machining, it is ready for use without additional heat treating or firing operations.

The application of Boron Nitride includes electric parts - heat sinks, substrates, coil forms, boron nitride wafers in silicon semiconductor processing, vacuum metlting crucible, microwave tubes, horizontal caster break rings, high temperature furnace fixtures and supports etc.

Type

99BN

CBN

ABN

ZBN

Main Content

BN>99%

BN>98.5%

BN+AlN

BN+ZrO2

Binder

B2O3

CaB2O6

ALBO3

B2O3

Density    (g/cm3)

1.95-2.0

2.0-2.1

2.6

2.95

Flexural Strength    (Mpa)

30

100

200

200

Compressive Strength    (Mpa)

100

280

350

380

Electrical Resistivity    (ohm.cm)

>10^14

>10^13

>10^14

>10^12

Max. Working Temp.    (°C)

air

900

900

900

1000

inert gas

2400

2400

2100

1800

vacuum

2200

2200

1900

1800

Thermal Conductivity    (W/m.K)

20

35

50

30

Expansion Coefficient  25 - 1000 °C (10^-6/K)

1.5

2

4.5

2.5

Typical Applications

High temperature furnace parts(insulator bushings)

X

X

X

Metal evaporation crucible

X

X

Molten material casting, metal and glass process

X

X

X

X

Rare metal or special alloy casting mould parts

X

X

X

X

High temperature stressed parts

X

X

Molten metal pipe, nozzles etc.

X

X

X

- Break rings for horizontal steel casting

- Feedthroughs for high voltage equipment

- Evaporator boats for aluminum metallization

- Nozzles for nonferroud metals

- Components for semiconductor manufacturing

- Crucibles for crystal growth

- Neutron absorbers

- Diffusion source wafers

- Boron dopant for silicon wafer

- Insulators in PVD / CVD vacuum coating chamber

- Electronic component assembling jigs

- Electronic components & substrates

- Spacers for glass melts and nonferrous

......

As a professional company in advanced ceramic industries, UNIPRETEC is manufacturing and supplying high quality and high precision ceramic components for clients from worldwide. Our ceramic products are widely used in various fields of automotive, metallurgy, machinery, electronic & electrical, food, chemical, medical and so on. With experienced engineers and talented workers, we are able to evaluate projects and drawings properly, make valuable suggestion, supply satisfying products. Our materials including:

- Aluminium Oxide ( 95% 96% 99% 99.5% 99.7% Al2O3 )
- Zirconium Oxide ( Yttria stabilized ZrO2 )
- Silicon Nitride ( Gas pressure sintered & Hot pressed Si3N4 )
- Boron Carbide ( B4C )
- Boron Nitride ( Hot pressed BN )
- Machinable Glass Ceramic

Aiming at building long term cooperation relationship with our clients, we set our motto as "Quality First". Far now, our products have been exported to North Amirica, East Europe, West Europe, East Asia, Southeast Asia and get good reputation from our client.