Boron Nitride - Properties and Applications of Grade ZSBN BN Ceramics by Precision Ceramics

Precision Ceramics, a division of McGeoch Technology, is a company dedicated to the engineering of technical ceramics. From procurement and supply through to technical design and specialist machining, we offer a complete service.

Our reputation for quality and service is truly international with specialist ceramic components engineered by Precision Ceramics finding their way into an ever-widening array of worldwide applications in industries as diverse as aerospace, opto-electronics and nuclear power.

Features of Solid Boron Nitride

A completely unique material, Solid Boron Nitride solves problems that could not possibly be tackled with other compositions such as Al2O3 or SiC.

Solid Boron Nitride fights off temperatures over 2,000°C and, depending on the grade, carries a dielectric strength of nearly 1000 volts/mil. Hot pressed in billet form, Solid Boron Nitride can easily be machined into rods, bars, plates and even custom shapes.

The highly exceptional characteristics of Solid Boron Nitride make it ideal for fixture or jig materials for sealing or brazing operations in induction, vacuum and atmosphere furnaces; for molten metal crucibles; heat sinks and high temperature insulators.

Solid Boron Nitride - Grade ZSBN

Developed for demanding applications requiring the combination of thermal conductivity, high wear resistance and boron nitrides corrosion resistance, Grade ZSBN boron nitride is a composite material combining the best thermal performance and machinability characteristics of hot-pressed boron nitride with the strength and non-reactivity of silicon carbide and zirconia.

Grade ZSBN is a uniquely high-performing solid that is especially suited for molten metal applications such as continuous casting breakrings where wear resistance and thermal conductivity are essential

Properties of Solid Boron Nitride - Grade ZSBN

The typical properties of Solid Boron Nitride Grade ZSBN includes the following:

Chemically - Unparalleled resistance to molten metal wetting due to boron nitride content.

Thermally - Excellent high temperature operation and thermal shock resistance.

Mechanically - Excellent wear resistance and increased strength from zirconia and a small amount of silicon carbide. This feature, unique to Grade ZSBN, results in remarkable corrosion resistance over a wide range of temperatures.

Machinability - Grade ZSBN is easily machined, even to complex shapes and forms, quickly and inexpensively. Machining tolerances of 0.002?or better are achievable.

Applications of Solid Boron Nitride - Grade ZSBN

Typical applications of Solid Boron Nitride Grade ZSBN include:

  • Break rings
  • Components
  • Continuous casting
  • Crucibles
  • Deck plates
  • Heat treatment fixtures
  • High temperature bearings
  • High temperature mechanical components
  • High temperature valves
  • Jigs
  • Molds
  • Motel metals and glass casting
  • Muffles
  • Nozzles for transfer or atomization
  • Side dams
  • Spacers

Thermal Properties of Solid Boron Nitride - Grade ZSBN

The thermal properties of Solid Boron Nitride Grade ZSBN is outlined in the following table.

Table 1. Thermal properties of solid boron nitride grade ZSBN

Thermal Conductivity (W/M°C)

Perpendicular

Parallel

25°C

40.21

22.62

316°C

29.39

15.46

437°C

27.16

13.98

557°C

24.96

13.32

711°C

23.11

12.78

918°C

21.88

11.65

Like pure boron nitride, the Grade ZSBN crystal structure orients itself during hot pressing.  Therefore, many physical properties of Combat Grade ZSBN are anisotropic and are reported as a function of the orientation of  the piece relative to hot pressing (perpendicular or parallel)

This information has been sourced, reviewed and adapted from materials provided by Precision Ceramics.

For more information on this source, please visit Precision Ceramics.

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