Boron Nitride (BN) is a white, low porosity refractory material with physical and mechanical properties similar to Graphite. However, unlike Graphite, Boron Nitride has high thermal conductivity and good thermal shock performance. The most common formulation of Boron Nitride contains boric oxide, which can cause Boron Nitride to absorb moisture, resulting in swelling and property degradation.

It is produced in a hot pressed form and the resulting material properties are anisotropic relative to the press direction. In fact, the material properties can vary considerably depending on the direction or the grade of the material. Futhermore, it is easily machined into complex shapes using standard carbide tooling. The operation temperatures range from 900°C for oxidizing environments to 2200°C for inert environments.

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.