Boron Nitride - Properties and Applications of Grade AX05 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 - 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

Properties

Description

Binder

None

Binder Melting Point

None

MAXIMUM USE TEMPERATURE

 

Oxidizing

850°C

Inert

>2000°C

Specific Heat J/g °C

0.35

Dielectric Strength

1000V

Pressing Direction

Para (Perp)

Resistivity Ohm-cm RT

>1014 (1015)

Loss Tangent at 8.8 GHz

0.0012 (0.0003)

Dielectric Constant at RT

4.0

THERMAL CONDUCTIVITY

 

(W/m/L) at 25°C

78 (130)

THERMAL EXPANSION COEFFICIENT

 

(RT to 1500°C) (in/in.°Cx10-6): 1.0 (0.3)

 

FLEXURAL STRENGTH (psi)*

 

at 25°C

2600 (3100)

at 1500°C

6200 (11000)

Density (g/cc minimum)

1.85

% Open Porosity

12.57%

Oxygen - max

1%

Carbon - max

0.02%

Calcium - max

0.04%

Other Impurities - max

0.05%

*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.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Precision Ceramics. (2019, August 22). Boron Nitride - Properties and Applications of Grade AX05 BN Ceramics by Precision Ceramics. AZoM. Retrieved on December 11, 2019 from https://www.azom.com/article.aspx?ArticleID=4481.

  • MLA

    Precision Ceramics. "Boron Nitride - Properties and Applications of Grade AX05 BN Ceramics by Precision Ceramics". AZoM. 11 December 2019. <https://www.azom.com/article.aspx?ArticleID=4481>.

  • Chicago

    Precision Ceramics. "Boron Nitride - Properties and Applications of Grade AX05 BN Ceramics by Precision Ceramics". AZoM. https://www.azom.com/article.aspx?ArticleID=4481. (accessed December 11, 2019).

  • Harvard

    Precision Ceramics. 2019. Boron Nitride - Properties and Applications of Grade AX05 BN Ceramics by Precision Ceramics. AZoM, viewed 11 December 2019, https://www.azom.com/article.aspx?ArticleID=4481.

Ask A Question

Do you have a question you'd like to ask regarding this article?

Leave your feedback
Submit