Boron nitride Breaking Ring, also known as white graphite, has a structure similar to that of graphite. It has good electrical insulation, thermal conductivity, excellent thermal shock resistance and Chemical stability. BN-sintered parts are generally produced by hot-pressing sintering. The densification mechanism can be described as vitreous sintering. Small amounts of boron oxide (B2O3) function as the liquid phase during sintering and as a binder for the BN platelets. In contrast to some other non-oxide ceramics, there is no solution and precipitation process known for the sintering of BN.
Material Properties：
* High thermal conductivity
* Excellent thermal shock resistance
* Low thermal expansion
* Exceptional heat resistance
* Good Chemical Inertness
* High electrical resistance
* Low dielectric constant and loss tangent
* High volume resistivity
* Excellent machinability
Grades 5 grades of boron nitrides are involved in Boron Nitride product series.
* BN99 ● CABN ● ALBN ● ZRBN ● ZABN ● SB
* BN99 ● CABN ● ALBN ● ZRBN ● ZABN ● SB
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Boron Nitride Properties:
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Thermal Conductivity
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(40-50)W/m·k
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Thermal expansivity
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(6.5-7.5)*10-6 °C
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Resistivity
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>1012 Ω·m
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Puncture voltage
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(2.5-4.0)*106 /kv·m
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Dielectric constant
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3.8-4.3
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Bending strength
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>35mpa
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Compression strength
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>200mpa
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Density
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1.9—2.2 g/cm3
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Working Temperature
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Oxidizing Atmosphere
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850°C
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Vacuum and inertia
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2000°C
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Applications:
1. Electronic parts – heat sinks, substrates, coil forms, prototypes
2. Vacuum melting crucibles
3. CVD crucibles
4. Microcircuit packaging
5. Sputtering targets
6. High precision sealing, brazing, and metallizing fixtures
7. Microwave tubes
8. Horizontal caster break rings
9. Low friction seals
10. Plasma arc insulators
11. High temperature furnace fixtures and supports
2. Vacuum melting crucibles
3. CVD crucibles
4. Microcircuit packaging
5. Sputtering targets
6. High precision sealing, brazing, and metallizing fixtures
7. Microwave tubes
8. Horizontal caster break rings
9. Low friction seals
10. Plasma arc insulators
11. High temperature furnace fixtures and supports
