About Boron Nitride Ceramics
Hexagonal boron nitride (HBN) in its solid form is often referred to as “white graphite” because its microstructure is similar to graphite. However, unlike graphite, HBN is an excellent electrical insulator with a high oxidation temperature. It has high thermal conductivity and good resistance to thermal shock, and can be easily machined to almost any shape tolerance. After machining, it can be used without additional heat treatment or sintering operations.
Hexagonal boron nitride ceramics (HBN) can be used in the manufacture of crucibles for melting semiconductors and high-temperature containers for metallurgy, semiconductor heat dissipation and insulation parts, high-temperature bearings, thermocouple bushings, and glass-forming molds.
The preparation of diamond-type boron nitride is similar to the principle of transforming graphite into diamond, and graphite-type boron nitride (HBN) can be transformed into diamond-type boron nitride (CBN) at high temperature (1800℃) and high pressure (800Mpa).
Boron nitride chemical formula
Boron nitride, with the chemical formula BN and a chemical composition of 43.61 TP3T of boron and 56.41 TP3T of nitrogen, comes in four different variants: hexagonal boron nitride (HBN), rhombic boron nitride (RBN), cubic boron nitride (CBN), and fibrillated zincite boron nitride (WBN).
Pyrolytic Boron Nitride Ceramics
Pyrolytic boron nitride (PBN) ceramics are a type of boron nitride ceramics prepared by chemical vapor deposition through a high temperature pyrolysis reaction.
Hexagonal boron nitride HBN
Hexagonal Boron Nitride H-BN is white in color, chemically stable and resistant to most molten metal impregnation. It has good self-lubrication. It has low hardness and can be machined with an accuracy of 1/100mm.
Boron Nitride Structural Ceramics
Boron Nitride Ceramic Nozzle
Customized precision machining
Boron Nitride Ceramic Crucible
Machining accuracy ±0.001mm
Boron Nitride Ceramic Pad
Multi-Industry Applications
Boron Nitride Ceramic Rings
Customized processing
Boron Nitride Threaded Pipe
Customized processing of shaped parts
Boron Nitride Ceramic Parts
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Performance characteristics of boron nitride ceramics
Properties of Boron Nitride Ceramics
Mechanical properties of boron nitride ceramics
| sports event | unit (of measure) | Boron Nitride Ceramics | Pyrolytic boron nitride | Composite boron nitride |
|---|---|---|---|---|
| base | % | BN>99% | BN>99.99% | -- |
| glues | -- | boron oxide | not have | -- |
| color | -- | fig. reactionary | fig. reactionary | grizzly |
| intensity | g/cm³ | 2.0 | 2.0-2.2 | 2.3~2.9 |
| durometer | MPa (Knoop) | 39 | 692 | ＞100 |
| compressive strength | MPa | 100 | 173 | 280 |
| bending strength | MPa | 30 | 150 | ＞100 |
Thermal properties of boron nitride ceramics
| sports event | unit (of measure) | Boron Nitride Ceramics | Pyrolytic boron nitride | Composite boron nitride |
|---|---|---|---|---|
| Maximum operating temperature | ℃ (in oxidizing atmosphere) | 850 | 1000 | 1000 |
| Maximum operating temperature | ℃ (in an inert atmosphere) | 2200 | 3000 | 2000 |
| Maximum operating temperature | ℃ (under vacuum) | 1800 | 2300 | -- |
| Thermal conductivity@25℃ | W/(m・K) | ＞30 | 60 | 35 |
| Coefficient of linear thermal expansion | 25 - 1000°C, × 10^-6/°C | ＞1.8 | -- | 2 |
| specific heat capacity | J/g-°C | 0.81 | 0.90 | -- |
Electrical Characteristics of Boron Nitride Ceramics
| sports event | unit (of measure) | Boron Nitride Ceramics | Pyrolytic boron nitride | Composite boron nitride |
|---|---|---|---|---|
| dielectric constant | 1MHz | 4.0 | 3.0 | -- |
| dielectric strength | kV/mm | 79 | 56 | 9.0 |
| Volume Resistance@25℃ | Ω・cm | ＞10^13 | ＞10^14 | ＞10^13 |
Note: All the above parameters in the table are typical parameters of boron nitride ceramics, please note that there may be differences due to different batches.
What are the uses of boron nitride ceramics?
- Fracture rings for continuous casting of metals
- Heat Treatment Fixture
- High temperature lubricants
- release agent
- Molten metal and glass castings
- Nozzles for transfer or atomization
- laser nozzle
- Induction heating coil holder
- shims
- High temperature and high voltage insulators
- Furnace supports requiring resistivity
- Crucibles and containers for high-purity molten metals
- Radar components and antenna windows
- Ion thruster discharge channel
China Boron Nitride Ceramics manufacturers
Zhihao Ceramics is a professional manufacturer and processor of boron nitride ceramics in China. Since 2013, we have participated in and supplied more than 3,000 kinds of precision ceramic products to hundreds of companies.
We can provide you with ceramic machining, ceramic materials, ceramic casting, ceramic metal encapsulation and surface metallization services, and are committed to providing products and services that meet or exceed our customers' quality requirements.
Boron Nitride Ceramic Processing
To Good Ceramics is your Boron Nitride Ceramics custom machining specialist for your advanced ceramic prototyping needs. We are always happy to utilize our years of advanced ceramics experience to advise on materials, designs and applications. If you are looking to purchase boron nitride sheets, rods, tubes, or custom machined parts, please contact us and one of our experts will be happy to assist you.
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