Boron Nitride solids, with minute (<0.1%) Boric Oxide concentrations, are extremely light sensitive and will turn yellow with exposure -- even under fluorescent lights within an office environment. The color change has no effect on the mechanical or electrical properties of Boron Nitride. For more information on coloration, select the Coloration in AX05 document at right.
Chemically 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 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 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 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 AX05 an excellent material for high power, low loss insulators, containers and fixtures.
Machinability 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.
|Binder Melting Point:||None|
|Maximum Use Temperature|
|Dielectric Strength:||1000 V|
|Pressing Direction||Para (Perp)|
|Resistivity Ohm-cm RT:||>1014 (1015)|
|Loss Tangent @ 8.8 GHz:||.0012 (.0003)|
|Dielectric Constant @ RT:||4.0 (4.0)|
|Thermal Conductivity |
|(W/m/L) @ 25°C:||78 (130)|
|Thermal Expansion Coefficient|
|(RT to 1500°C) (in/in/°C x 10-6):1.0 (0.3)|| |
|Flexural Strength (psi)* |
|@ 25°C||2600 (3100)|
|@ 1500°C||6200 (11000)|
|Density (g/cc min.):||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.
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