High Temperature Sialon Thermocouple Tubes


A new range of high temperature silicon nitride and sialon advanced ceramic thermocouple protection tubes sheaths for use in the non-ferrous industry.


For both Smelters and Foundries!

  • Maximum temperature of 1450 °C   in air and up to 1800 °C in a controlled atmosphere!
  • Sialon thermocouple protection tubes are for both, direct as well as indirect temperature sensing in molten metal (e.g. furnace wall or roof)
  • temperature reading for low-pressure-die-casting machines (e.g. Aluminum wheel manufacturers)
  • For temperature measurements in non-ferrous launders or pouring troughs

20 in stock (can be backordered)

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High Temperature Sialon Thermocouple Tubes

Sialon, very differently from slibcasted syalon, thermocouple protection tubes sheaths are an advanced ceramic tube offering outstanding performance for temperature control in aluminium foundries and smelters and are extremely cost effective compared to other materials, such as cast iron, silicon carbide and alumina.

Sialons are alloys of silicon nitride and possess a unique combination of physical properties, such as high strength, toughness, excellent thermal shock resistance and resistance to corrosion, which make it the perfect material in this application.

We have two standard diameters sialon thermocouple tubes sheaths in stock in lengths varying from 150 mm up to 1,500 mm. Tooling cost may apply. Stock items have a standard groove.

Gas-tight stainless steel adapters are specially suitable for the thermocouple protection tubes sheaths. Test our new valve adapter for low-pressure die casting machines.

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Material data sheet Sialon (Si3Al3O3N5)
Typical Sialon grades NVD-001 NVD-002 NVD-003 NVD-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness (SEPB) MPam1/2 4 ~ 5 6 ~ 7 7 6 ~ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)


×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity (20℃) W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance 550 800 800 900
Volume Resistivity (20℃) Ω・cm >1014 >1014 >1014 >1014

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