Boron Nitride
Boron Nitride Grade M
Solid Boron Nitride Grade M is a truly hydrophobic advanced ceramic. Composed of boron nitride and silica, it is completely resistant to moisture and has a MIL-I-10A grade of L542, a test requiring immersion in water for 48 hours prior to testing at elevated frequencies. Grade M is suitable for the most severe electrical applications. It is an excellent refractory material at temperatures up to 1400°C, and is unparalleled in resistance to thermal shock.
Applications
- High temperature electrical insulators and vacuum furnace supports which require electrical resistivity, high temperature strength, thermal shock resistance and low chemical resistivity
- Crucibles and containers for high purity molten metals
- Tools and refractories for glass forming which provide non-wetting, non-B2O3 containing contacts
- Radar components and antenna windows which require exacting electrical and thermal properties
| Typical Properties | ||
|---|---|---|
| Typical Chemical Analysis | Grade M | Grade M26 |
| Boron1 | 18 - 20.25% | 26.5 - 28.7% |
| Nitrogen1 | 22.5 - 25.5% | 32.8 - 35% |
| Oxygen2 | - | - |
| Calcium1 | .01%3 | .01%3 |
| Silica (SiO2)1 | 60% | 40%1 |
| Other Inorganic1 | .02% | .05% |
| Trace Metals | .05% | .05% |
| TOTAL | 100% | 100% |
| B2O3* | .2% | .2% |
B2O3 is given for clarification and is not part of the elemental analysis 1 Wet Chemistry – 2 LECO Oxygen – 3 Optical Emission Spectroscopy
| Typical Properties | ||||
|---|---|---|---|---|
| Typical Chemical Analysis | Grade M | Grade M26 | ||
| Percent BN: | 40 | 60 | ||
| Percent SiO2: | 60 | 40 | ||
| Parallel | Perpendicular | Parallel | Perpendicular | |
| Volume Resistivity (ohm-cm) @ RT: @ 1500℃: | 1.7 x 1015 2.4 x 1013 | 5.1 x 1015 3.3 x 1013 | 6.4 x 1014 2.4 x 1013 | 2.9 x 1015 8.5 x 1013 |
| Dielectric Constant (@ IMHz) @ RT: microwave frequency: @ RT, 8.8 GHz: | 4.21 3.86 | 3.87 4.08 | 4.48 3.89 | 3.89 4.28 |
| Dielectric Strength: volts/mil & (volts/mm) | ||||
| Sample Thickness: 10 mil. Tested up to 25kV) 25 mil | 1670 (65748) >1000 (>39370) | 1690 (66535) >1000 (39370) |
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| Dissipitation Factor (Loss Tangent) | ||||
| @RT @ 1 MHz @150℃ @ 1 MHz @RT @ 8.8 GHz | .0016 .0017 .0011 | .0035 .0055 .0005 | .0017 .0094 .0039 | .0061 .0062 .0006 |
| Loss Factor @RT @ 1 MHz @150℃ @ 1 MHz @RT @ 8.8 GHz | .0067 .0077 .0042 | .0140 .0230 .0020 | .0076 .0440 .0150 | .0230 .0250 .0260 |
| Surface Resistivity (ohms/ ) @RT @150℃ | 8.5 x 1016 1.4 x 1015 | 4.2 x 1016 1.5 x 1015 |
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