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Product Description
Si3N4 or Sialon/Syalon material can be widely used as the main material of protection tubes for thermocouple, for long working lift and free maintenance.
As the necessary means of measuring temperature, thermocouple protection tubes are applicable in metallurgical industry, such as aluminum, tin, lead, zinc etc.
Advantages:
1. Si3N4 material has better thermal shock resistance and high-temperature mechanical strength, light weight, high strength and easy to operate. It will not burst even if exchange is done in the course of processing, making it easy for production and maintenance.
2. Si3N4 material has the low conductive advantage. Its low specific heat minimizes loss of heat. This will be conductive to achieving the accuracy of temperature measurement for the thermocouple protection tube.
3. Molten aluminum’s low wettability prevents stick of slagging in the tube, thus easy to maintain and operate.
4. Si3N4 has excellent corrosion resistance and wear resistance, and ensure longer working life. If proper maintenance, the actual using life can be up to 2-3 years.
Physical properties
Property | Unit | Si3N4 |
Density | G/cm3 | 3.2 |
Porosity open | % | 12 |
Flexural strength | MPa | 750 |
Young’s modules | GPa | 280 |
Compressive strength | MPa m1/2 | 6.5 |
Vickers-hardness HV1 | GPa | 15 |
Coefficient of thermal expansion | x10-6/℃ | 3.4 |
Thermal conductivity | W/(m.k) | 26 |
Specific heat | J/(g.k) | 0.65 |
Volume resistivity | Ω•cm | >1014 |
Heat resistance | ℃ | 800 |
Max. Operation temperature in air | ℃ | 1400 |
Standard sizes(mm)
Outer Dia | Inner Dia | Setting Groove |
11.5 | 6.5 | 10 |
15 | 9 | 10 |
22 | 14 | 14.5 |
29 | 16 | 14.5 |
30 | 16 | 14.5 |
32 | 20 | 14.5 |
No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
L (inch) | 400 (15.75) | 500 (19.65) | 600 (23.62) | 700 (27.56) | 800 (31.50) | 900 (35.43) | 1000 (39.37) | 1100 (43.31) | 1250 (49.21) |
