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Sialon Heater Tubes

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Sialon Heater Tubes

Sialon Heater Tubes for use in in-line degassing boxes such as ALPUR® TS15, TS35, TS55, TS75, TS90, G3 cc Line degasser, SNIF, Hertwich.

We offer a wide range of twenty grades of advanced ceramic silicon nitride and Sialon immersion heater tubes for use in aluminium and non-ferrous molten metal handling industries. Fine silicon nitride and sialon foundry products offer long life and are cost effective compared to competitive materials, such as cast iron and refractory ceramics, such as silicon carbide and aluminium titanate. Sialon is an alloy of silicon nitride and combines excellent thermal and mechanical properties.

Sialon has found extensive use in non-ferrous molten metal applications as a result of its high strength, toughness, thermal shock resistance, corrosion resistance and its non–wetting properties in contact with aluminium and its alloys.



Sialon Heater Tubes | Sialon Immersion Tubes | Sialon CeramicsSialon heater tubes are the most effective method of heating the melt in the aluminium processing industry.

Our heater tubes are often used in degassing boxes such as ALPUR, Pyrotek SNIF, Hertwich or even Chinese manufacturers of inline degassing systems for molten aluminium.

The range of heater tubes available is very diverse and can be manufactured to a maximum outside diameter of 200mm and maximum length of 1600mm.

The combined properties of silicon nitride (high strength, hardness, fracture toughness, and low thermal expansion) and aluminum oxide (corrosion resistance, chemically inert, high temperature capabilities, and oxidation resistance).

Sialon heater tube’s, ceramic heater tubes, Sialon immersion tubes made of silicon nitride with 500 % more thermal conductivity (50 W/mK) than conventional Silicon Nitride, Si3N4 heater tubes (17 W/mK) combined with the highest impact fracture toughness of 7.7 MPa · m1/2.

With an extensive product line offering from small style sialon sheaths to the largest Sialon immersion tubes for ALPUR degassing units, our company has the experience and capability to satisfy your needs.

Sialon immersion tubes are available with plain ends, grooved ends for assembly with metal flanges, or with integral collars for the optimum in strength and reliability. Sialon heater tube’s are made of a very homogeneous material that provides uniformity and consistent thermal conductivity, not to be confused with silicon nitride or syalon.

Because of its strength and corrosion resistance, our silicon nitride heater tubes have proven effective with both electric and gas fired heaters.

Sialon heater tubes have a very long service life and have a 12 months warranty against chemical attack.

Additional information

Weight 23 kg

Features Sialon Heater Tubes

Very high thermal conductivity of 85 W/mK.
Considerably stronger than Silicon Nitride or Syalon.
Highest impact fracture toughness of 7.7 MPa · m1/2
Excellent non-wetting properties.
12 months warranty against chemical attack.
Standard tolerance of +/- 0,5 mm.

Typical applications:

For heating molten aluminium in ALPUR DC-10, TS. G3 degassing boxes with Sialon Heater Tubes and Silicon Nitride Heater Tubes.

Sialon data sheet

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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Drawing Sialon Immersion Heater

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