Boron Nitride - Properties and Applications of Grade AX05 BN Ceramics by Precision Ceramics

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Features of Solid Boron Nitride - Grade AX05

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 AX05

Solid Boron Nitride Grade AX05 is one of the highest purity hexagonal boron nitride solids available and a wise choice for applications where corrosion resistance is more important than wear resistance. It is a diffusion bonded ceramic and does not depend on B₂O₃ to other binders for mechanical integrity and, consequently, it is non-wet by almost all molten metals. This ultra purity advantage allows for applications and uses not provided by other hot pressed boron nitride solids, such as crucibles for high-purity molten metals. Commonly used in applications that demand very high thermal conductivity such as nozzles with small orifices.

Properties of Solid Boron Nitride - Grade AX05

The typical properties of Solid Boron Nitride Grade AX05 includes the following:

Chemically - Solid Boron Nitride Grade AX05 is extremely inert and non-wet by many molten materials such as metals, glasses, halide salts and other reagents. The chemical stability allows Grade AX05 to provide a stable, non-reactive material for nozzles, feed- throughs, crucibles and supports.

Thermally - Solid Boron Nitride Grade AX05 has minimal thermal expansion, high thermal conductivity and use temperature in certain inert atmospheres over 2000°C. Thermal shock stability is excellent over a wide range of use temperatures.

Mechanically - Solid Boron Nitride Grade AX05 yields increasing relative strength vs. temperature. This important feature provides higher temperature performance to applications previously unattainable with B₂O₃ to other bonded boron nitrides.

Electrically - Solid Boron Nitride Grade AX05 is transparent to microwave energy. It also provides high resistivity and dielectric strength with a low loss tangent and dielectric constant. These characteristics make Grade AX05 an excellent material for high power, low loss insulators, containers and fixtures.

Machinability - Solid Boron Nitride Grade AX05 can be machined to extremely close tolerances using standard high speed “tool steel?equipment. Machining by grinding may be used if preferred or stringent tolerances are required. Threads can be machined using taps and dies. Cutting oils and coolants should not be used for any reason.

Applications of Solid Boron Nitride - Grade AX05

Typical applications of Solid Boron Nitride Grade AX05 include:

• High temperature electrical insulators and vacuum furnace supports which require electrical resistivity, high temperature strength, thermal shock resistance and low chemical reactivity.
• Crucibles and containers for high purity molten metals Insulators and source fixtures for ion implantation systems which require high temperature purity and electrical insulation.
• Setterplates for the processing of other advanced materials which require stable, inert surfaces.
• Nozzles for powdered metal spraying.

Physical Properties of Solid Boron Nitride - Grade AX05

The physical properties of Solid Boron Nitride Grade AX05 is outlined in the following table.

Table 1. Physical properties of solid boron nitride grade AX05

*Based on 4-pt bend test-Sample size = 51mm x 4mm x 3mm

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

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