Ceramic Parts China Inc.
Boron Nitride is a synthetic technical ceramic material, which is available in powder, solid, aerosol and liquid forms. In solid form it can be machined easily with ordinary metalworking tools. Boron Nitride has out-standing thermal characteristics; high thermal conductivity and excellent thermal shock resistance. Boron Nitride in solid form is available in 3 grades, each having different characteristics
HPBN most common grade is manufactured by hot pressing. Its crystal structure is hexagonal. Due to the uniaxial densification method, the anisotropy of HPBN platelet structure is created. As a result of the anisotropy, different physical properties occur, parallel or perpendicular to the pressing direction. HPBN is non toxic and can be easily machined.
| Applications | Properties | Chemical Composition | |
| Electrical insulators for high temperature applications | Excellent thermal shock behaviour | Boron
Nitrogen Oxygen |
40-42.6%
49-52.9% 3-5% |
| Thermocouple tubes | High electrical resistivity | Calcium
SiO2 |
2-3%
0.2% |
| Crucibles and nozzels for
molten metals |
Chemically stable | B203
Others |
0.4
0.03% |
| Rolls and support elements in the glass manufacturing
industries |
Extraordinary thermo cycling properties | ||
| High temperature material | |||
Standard shapes and maximum dimensions:
HPBN is hot pressed in block shapes up to 280mm diameter and 300mm height.
We will be pleased to offer made to order parts to your drawings and requirements.
Physical Properties of hot pressed Boron Nitride:
| Pressing Direction | Parallel | Perpendicular | ||
| Compressive Strength | Mpa | 30 | 48 | |
| Young?s modulus | RT | Gpa | 34.1 | 75.2 |
| Flexural Strength | RT | Mpa | 43.7 | 60.2 |
| 1000°C | 12.5 | 17.4 | ||
| 1500°C | 11.8 | 17.0 | ||
| Density | g/cm³ | 1.9-1.95 | 1.9-1.95 | |
| Vickers Hardness | kg/mm² | 12.01 | 10.88 | |
| Thermal Expansion | RT-350°C | x10-6K-1 | 0.0 | 0.0 |
| RT-700°C | 0.67 | 0.0 | ||
| RT-1500°C | 2.95 | 0.87 | ||
| Thermal Conductivity | RT | W/mK | 27.22 | 30.98 |
| 300°C | 23.03 | 27.22 | ||
| 500°C | 21.77 | 26.38 | ||
| 1000°C | 20.52 | 25.54 | ||
| Max usage temperature
Inert atmosphere |
°C | 1500 | 1500 | |
| Oxide atmosphere | 850 | 850 | ||
| Volume resistivity | Wcm | |||
| RT | 1.7×1014 | 4.0×1014 | ||
| 150°C | 1.7×1014 | 1.9×1014 | ||
| Dielectric Strength | KV/mm | >39.4 | >39.4 |
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518108
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