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Boron Nitride is an advanced synthetic ceramic material available in solid and powder form. Its unique properties – from high heat capacity and outstanding thermal conductivity to easy machinability, lubricity, low dielectric constant, and superior dielectric strength – make boron nitride a truly outstanding material. In its solid form, boron nitride is often referred to as “white graphite” because it has a microstructure similar to that of graphite. However, unlike graphite, boron nitride is an excellent electrical insulator that has a higher oxidation temperature. It offers high thermal conductivity and good thermal shock resistance and can be easily machined to close tolerances in virtually any shape. After machining, it is ready for use without additional heat treating or firing operations.
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Product Information
Boron Nitride is an advanced synthetic ceramic material available in solid and powder form. Its unique properties – from high heat capacity and outstanding thermal conductivity to easy machinability, lubricity, low dielectric constant, and superior dielectric strength – make boron nitride a truly outstanding material. In its solid form, boron nitride is often referred to as “white graphite” because it has a microstructure similar to that of graphite. However, unlike graphite, boron nitride is an excellent electrical insulator that has a higher oxidation temperature. It offers high thermal conductivity and good thermal shock resistance and can be easily machined to close tolerances in virtually any shape. After machining, it is ready for use without additional heat treating or firing operations.
We provide standard products & tailor-made products for hot-pressed boron nitride crucibles. Except for pure BN99 crucible, we also supply BN composites with silicon carbide, calcium borate, aluminum nitride, and zirconia, to fulfill various demands of the customers.
Our BN99 crucibles had been recorded to survive 3500C in inert gas. Please notice BN survives high temperatures in a vacuum, as it decomposes after 1900C. and the boron nitride ceramics will not crack, 1000 degrees of furnace heat out for 20 minutes to blow the air and cold repeatedly hundreds of times will not crack.
Synonyms
HBN rod, hot pressed BN rod，h-BN; Elbor; hexagonal boron nitride; Boron mononitride; Nitridoborane; Nitriloborane
Boron Nitride Crucible Specification
Dimensions
Per your request or drawing
We can customized as required
（Boron nitride is prone to moisture absorption and should not be placed in wet areas when the crucible is unused. Sealed, can not be washed, dirty, and wiped directly with sandpaper.）
Properties（Theoretical）
| Grade | BN99 | |
| Purity % | BN | 99% |
| Other Composite | B2O3 | 0.20% |
| Oxygen | <0.5% | |
| Carbon | 0.02% | |
| Calcium | 0.04% | |
| Structure | Hexagonal boron nitride (hBN) | |
| Density | 2 g/cm3 | |
| Hardness | 300 HL | |
| Flexural Strength | 3000 Psi | |
| Coefficient of thermal expansion | （25°C-1200°C） | -1~2.5 (10-6/K) |
| Thermal conductivity | 50 W/mk | |
| Max operating Temperature | Atmosphere | 900°C |
| Vacuum | 1800°C | |
| Inert | 2100°C | |
| RT Resistivity | ＞1014 Ω.cm | |
| Melting Point | 2973 °C | |
| Poisson's Ratio | 0.11 | |
| Specific Heat | 840 to 1610 J/kg-K | |
| Thermal Conductivity | 29 to 96 W/m-K | |
| Thermal Expansion | 0.54 to 18 µm/m-K | |
| Young's Modulus | 14 to 60 GPa | |
| Exact Mass | 25.012379 | |
| Monoisotopic Mass | 25.012379 |
| Mechanical Properties | Unit | Grade A | Grade HP | Grade AX05 | Grade M | Grade M26 | Grade ZSBN |
| BN | BN | BN | BN -40%、 SiO260% | BN -60%、SiO2-40% | BN -45%、ZrO2-45%、bsg <10 | ||
| Density | g/cm3 | 2 | 2 | 1.9 | 2.3 | 2.1 | 2.9 |
| Compressive Strength | MPa | 143 186 | 96 | 25 | 316.9 289.4 | 218.7 253.8 | |
| Flexural Strength @ 25°C | MPa | 94 65 | 59 45 | 22 21 | 103 76 | 62 34 | 144 107 |
| Young modulus | GPa | 47 74 | 40 60 | 17 71 | 94 106 | 71 71 | |
| Thermal Properties | |||||||
| Thermal Conductivity | W/mK | 30 34 | 27 29 | 78 130 | 12 14 | 11 29 | 24 34 |
| Max Temp (Oxidizing) 1 | °C | 850℃ | 850℃ | 850℃ | 1000℃+ | 1000℃+ | 850℃ |
| Max Temp (Inert) 1 | °C | 1200℃ | 1150℃ | 2000℃ | 1000℃+ | 1000℃+ | 1600℃ |
| 25-400°C | 10-6/K | 3.0 3.0 | 0.6 0.4 | -2.3 “0.7 | 1.5 0.2 | 3.0 0.4 | 4.1 3.4 |
| 400-800°C | 10-6/K | 2.0 1.4 | 1.1 0.8 | -2.5 1.1 | 1.2 0.4 | 2.5 0.1 | 5.6 4.3 |
| 800-1200°C | 10-7/K | 1.9 1.8 | 1.5 0.9 | 1.6 0.4 | 1.2 0.8 | 3.0 0.1 | 7.2 5.2 |
| 1200-1600°C | 10-8/K | 5.0 4.8 | 2.8 2.7 | 0.9 0.3 | 4.6 3-4 | ||
| 1600-1900°℃ | 10-9/K | 7.2 6.1 | 0.5 0.9 | ||||
| Electrical Properties | |||||||
| Dielectric Strength | kV/mm | 88 | >10 | 79 | >10 | 66 | >9 |
| Dielectric Constant | 1 MHz | 4.6 4.2 | 4.3 4.0 | 4.0 4.0 | 3.4 3.7 | 4.5 3.8 | |
| Dissipation Factor | 1 MHz | 1.2-3 / 3.4-3 | 1.2-3 / 3.0-3 | 1.2-3 / 3.0-3 | 3.0-3 / 3.1-3 | 1.7-3 / 6.7-3 | 4.5-2 / 6.7-2 |
| Volume Resistivity @25°C | ohm-cm | >10 >1014 | >1013 >1013 | >1013 ●1014 | >10'4 >1014 | >1013 >10'4 | ≥1014 、101 |
Note: the former = Parallel and the latter= Perpendicular
Hexagonal Boron Nitride Materials Types
Pyrolytic boron nitride PBN: 99.99% boron nitride
High purity boron nitride HPBN: >98.5% boron nitride + boron oxide
Calcium Borate Boron Nitride CABN: >97.5% Boron Nitride + Calcium Borate
Aluminum Nitride Boron Nitride ALBN: Boron Nitride + Aluminum Nitride + Boron Aluminum Oxide
Zirconia Boron Nitride ZRBN: Boron Nitride + Zirconia + Boron Oxide
Zirconium Aluminum Boron Nitride ZABN: Boron Nitride + Zirconia + Aluminum Nitride + Aluminum Boron Oxide
Silicon carbide boron nitride SCBN: boron nitride + silicon carbide + boron silicon oxide
Boron Nitride Crucible Materials
| Material | Description |
| BN99 | Hot pressed at high temperature (1900C).Excellent corrosion resistance and thermal conductivity. Limited wear resistanceSelf-bonded and high purity (>99%) |
| BNBO | General-purpose materialBonded by boric oxide |
| BNCB | Calcium borate bonded boron nitrideEnhanced moisture resistance |
| BN60 | BN 60%, SiO2 40% |
| BN40 | BN 40%, SiO2 60% |
| ZSBN | BN-45%, Zr2O3 45% |
Boron Nitride Crucible Advantages
-Excellent machinability，BN rods are easily machinable, and they are of high performance: -Low wettability to molten metal
-Low dielectric constant，k=4
-Relatively high dielectric strength，
-High dielectric breakdown strength, >40 KV/mm
-Relatively high thermal conductivity with low thermal expansion Extremely high working temperature with proper inert gas protection (>3000C has been recorded). Chemical Vapor Deposition (CVD)
- Excellent thermal shock resistance
- High electrical resistivity – excluding aerosols, paints, and ZSBN grade
- Low density • High thermal conductivity
-Anisotropic (thermal conductance differs between parallel and perpendicular planes to pressing direction)
- Corrosion resistant
-Good chemical inertness
-High temperature material
Boron Nitride Machining
Hexagonal boron nitride can be machined into highly complex geometries with very tight tolerances.
Applications of Boron Nitride Crucible
Crucibles for crystal growth
Break rings for horizontal casting machine
Insulators for high-temperature furnace
Feed through for high voltage equipment
Evaporator Boats
Nozzles for the nonferrous metals metallurgy industry
Electric insulators in the vacuum environment
Insulators for high-temperature furnace
Spacers for glass melting
Boron nitride spare parts for ion implantation equipment
Insulating gasket and seal for high temperature equipment
Boron nitride parts of vacuum coating equipment (instead of alumina)
Powder metallurgy atomizing nozzle
Boron Nitride Crucible Using Tips
The use temperature in the air can not exceed 1000 degrees, more than 1000 degrees of boron nitride and oxygen contact surface will oxidize and peel off.
Boron nitride is easy to absorb moisture, the crucible cannot be stored in a wet area, or not washed, it can be directly wiped with sandpaper or scrubbed with alcohol.
Boron Nitride Crucible Available Materials
Black metal: iron, copper, aluminum, nickel, magnesium, bismuth, zinc, etc., alloy FE-CO-NI-SI CO-ZR-NB.
No reaction between water and acid at room temperature.
Rare earth, boron acid, and ammonia.
Boron Nitride Crucible Unavailable Materials
Melantimony trioxide, chromium sevenoxide, molybdenum trioxide, arsenic trioxide, and titanium carbide.
Boron phosphate erodes boron nitride in 1400 degrees of nitrogen and will react with hot thick or molten alkali and hot chlorine gas.
Packing of Boron Nitride Crucible
Standard Packing:
Sealed bags in carton boxes. Special package is available on request.
As a ceramic material, BN is quite fragile in a lot of cases. The BN Crucible are usually held in plastic bags by vacuum, and protected with heavy foam.
ATTs’ BN Crucible is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.
Chemical Identifiers
| Linear Formula | BN |
| MDL Number | MFCD00011317 |
| EC No. | 233-136-6 |
| Beilstein/Reaxys No. | N/A |
| Pubchem CID | 66227 |
| IUPAC Name | azanylidyneborane |
| SMILES | B#N |
| InchI Identifier | InChI=1S/BN/c1-2 |
| InchI Key | PZNSFCLAULLKQX-UHFFFAOYSA-N |
| CAS | 10043-11-5 |
