Silicon nitride ceramics is a new modern engineering
materials with high strength, high hardness, strong corrosion resistance, high
temperature resistance, and many other excellent performance, widely used in
metallurgy, chemical, mechanical and aerospace and other fields.
Main Products: silicon nitride (Si3N4)
industrial pump mechanical seal rings. Various shafts, bushings, the plunger,
cylinder liner, bearing and other types of products. Thermocouple sheath pipes,
gas flow pipe blast pipe ect,and other mechanical parts, blades, nitride powder
( which are corrosion resistance, wear resistance, high temperature
resistance).
Silicon
nitride protection tube is widely used in metal casting industry, especially in
the aluminum industry, its performance is more superior than the silicon
carbide protection tube!
Our silicon nitride thermocouple protection tube is
produced by cold isostatic pressing (CIP) biscuit molding, then machined to
exact dimensions, and then put into the high temperature reaction sintering
furnace,sintering. With this modern and advanced
technology，the special
ceramic products have high density and uniform size and high precision. Silicon nitride have resistance of aluminum
melting. It is particularly suitable as thermocouple protection tube for measuring
the temperature of the molten aluminum.
Our
company is now producing silicon nitride thermocouple protection tubes
according to customer requirements. Protection tube ID:6-30MM,OD:10-40MM:
Length: within 800MM.
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Property of si3n4 |
|||||
|
Si3n4 |
reaction sintering |
pressureless sintering |
gas pressure sintering |
hot pressed sintering |
|
|
Si3N4 |
Si3N4 |
Si3N4 |
Si3N4 |
||
|
Bulk density g/cm3 |
2.5-2.6 |
3.22-3.24 |
3.24-3.26 |
3.24-3.28 |
|
|
Hardness HRA |
80-88 |
90-92 |
91-92 |
92-94 |
|
|
rupture strength |
RT |
180-220 |
650-670 |
750-800 |
850-950 |
|
1200℃ |
180-220 |
500-550 |
500-600 |
600-700 |
|
|
fracture toughness Mpa√m |
2.0-2.5 |
6-7 |
6-7 |
8-9 |
|
|
coefficient of thermal expansion 10-6/℃ |
2.8-2.85 |
3.0-3.2 |
3.0-3.2 |
3.2-3.4 |
|
Property of si3n4 | |||||
Si3n4 | reaction sintering | pressureless sintering | gas pressure sintering | hot pressed sintering | |
Si3N4 | Si3N4 | Si3N4 | Si3N4 | ||
Bulk density g/cm3 | 2.5-2.6 | 3.22-3.24 | 3.24-3.26 | 3.24-3.28 | |
Hardness HRA | 80-88 | 90-92 | 91-92 | 92-94 | |
rupture strength | RT | 180-220 | 650-670 | 750-800 | 850-950 |
1200℃ | 180-220 | 500-550 | 500-600 | 600-700 | |
fracture toughness Mpa√m | 2.0-2.5 | 6-7 | 6-7 | 8-9 | |
coefficient of thermal expansion 10-6/℃ | 2.8-2.85 | 3.0-3.2 | 3.0-3.2 | 3.2-3.4 | |
