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Technical Parameters
LEPE® silicon nitride (Si3N4) protection tube is made of high-quality high-purity silicon nitride powder, scientifically proportioned, isostatically pressed and sintered at high temperature. It has excellent thermal stability, thermal shock resistance, mechanical strength and corrosion resistance, which helps to reduce elution pollution, and has a long service life and can save costs. The main products are protective tubes, riser tubes, degassing rotors and other special-shaped products.
|
Item |
Unit |
Silicon nitride L-200
|
Silicon nitride L-500
|
|
Bulk density |
g/cm³ |
3.2 |
3.2 |
|
Water absorption |
% |
0 |
0 |
|
Bending strength |
Mpa |
750 |
800 |
|
Young modulus |
Gpa |
280 |
290 |
|
Fracture toughness |
MPa·m1/2 |
6.5 |
7 |
|
Poisson’s ratio |
－ |
0.28 |
0.28 |
|
Vickers hardness
|
Gpa |
15 |
15 |
|
Coefficient of linear expansion |
x10-6/℃ |
3.4 |
3.5 |
|
Thermal conductivity
|
W/(m·k) |
26 |
50 |
|
Specific heat
|
J/(g·k) |
0.65 |
0.61 |
|
Volume resistivity |
Ω·cm |
>1014 |
>1014 |
|
Heat shock resistance |
℃ |
800 |
900 |
|
Maximum operation temperature |
℃ |
1150 |
1150 |
Use Precautions
1、The product should be dried before use.
2、It should be preheated before heating the cold kiln.
3、It should be cooled and heated gradually, avoid fast cooling and heating.
4、It should be handled with care, avoid beating by sharp objects.
5、The heating part of the heater must be heated under the aluminum liquid to prevent the heater from drying in the protective tube.
6、When installing the flange, please select a high temperature resistant and flexible gasket to avoid leaking。
7、Keep regular cleaning and maintenance can prolong the service time, otherwise, the life time will be shorter.
