Boron nitride (piro)
Boron nitride is a ceramic material that is characterized by relatively high thermal conductivity (can reach up to 90 W / m * K) and resistance to high temperatures. Unlike other ceramic materials, the operating temperature can reach up to 2100 C in a vacuum and an inert environment and 1000 C in an oxygen environment. The material also belongs to the group of refractory materials due to the described properties.
Specifications
|
Properties |
Conditions |
Units |
Type |
||
|
Colour |
|
|
White |
White |
White |
|
Bulk density |
|
г/см3 |
≥ 2,00 |
≥ 2,30 |
≥ 1,60 |
|
Flexural strength |
|
МПа |
35 |
85 |
18 |
|
Compressive strength |
|
МПа |
85 |
225 |
45 |
|
Modulus of elasticity |
|
ГПа |
— |
56 |
— |
|
Poisson 's Ratio |
|
|
— |
0,27 |
— |
|
Hardness |
|
кг/мм2 |
— |
1310 |
— |
|
Fracture toughness |
|
МПа∙м1/2 |
— |
5 |
— |
|
|
|
|
|
|
|
|
Coefficient of thermal expansion |
25-1000 °C |
10-6 /°C |
1,8 |
11,9 |
1,5 |
|
40-400 °C |
10-6 /°C |
|
|
|
|
|
20-800 °C |
10-6 /°C |
|
11,9 |
|
|
|
Thermal conductivity |
— |
Вт/м∙K |
40 |
35 |
35 |
|
25 °C |
Вт/м∙K |
|
35 |
|
|
|
100 °C |
Вт/м∙K |
|
35 |
|
|
|
Maximum operating temperature |
|
°C |
|
1440 |
|
|
в O2 |
°C |
900 |
1440 |
900 |
|
|
vacuum |
°C |
1900 |
— |
1900 |
|
|
gass |
°C |
2100 |
— |
2100 |
|
|
Dielectric constant |
1 МГц |
— |
3,5 |
10,2 |
3,0 |
|
Volumetric resistance |
25 °C |
Ом∙см |
≥ 1014 |
≥ 1014 |
≥ 1014 |
|
Thick film |
нет |
нет |
нет |
||
|
Thin film |
|
|
да |
да |
да |
Application area
- turbine parts (blades, etc.);
- furnace parts;
- snap-in;
- enclosures;
- any products operating at elevated temperatures (more than 1000 C).