Silicon nitride Heater Protection Tube

Si3N4 or Sialon/Sylon material is applicable for making molten aluminum liquid heater protection tube and the gas burner protection tube in metallurgical industry like aluminum,tin,lead,zinc etc.The advantages of Si3N4 material are as follows:

With good thermal shock resistance and high temperature mechanical strength,therefore, the products can withstand severe thermal load of high temperature heaters. Repeated insertion and withdrawal of the products in the course of operation will not affect the performance.

Silicon nitride Heater Protection Tube

●High thermal shock performance assures long working time when warming and cooling of molten aluminum, and also temperature difference between heater and liquid.

●Low wettability against molten aluminum can reduce the contacting of slag on the protection tube, and provides easy maintenance and operation.Excellent insulation can assure no contact .(insulation) between heater and molten aluminum or other molten metal.

●With good high-temperature mechanical strength,corrosion resistance and low wettability, the Si3N4 material can protect the normal working of heater element in the tube for a long time. If proper maintenance, the actual using life can be up to 2-3years

1.Resistance to thermal shock

Si3N4 or Sialon/Syalon has superior thermal shock resistance and high temperature mechanical strength.

Prior to the application of Si3N4 or Sialon/Syalon products, preheating is necessary. The preheating process can realize better reliability than conventional ceramic.

2.Resistance to corrosion

Si3N4 or Sialon/Syalon has excellent corrosion resistance,being almost inert against molt aluminum, thus ensuring longer life.

3.Low- wettability

As a covalent binding ceramic，Si3N4 or Sialon/Syalon has low wettability against molten metal and does not require coating. lt will not generate much scorification and material adsorption, as a result, it is easy to clean.

4.Low heat conduction

Si3N4 or Sialon/Syalon has the advantage of low heat conduction. lts low specific heat reduces loss of heat to the minimum. This guarantees the accuracy in temperature measurement for the thermocouple protection tubes,and facilitates molten metal heat to convey in stalk tube.This can reduce the temperature of molten aluminum and save overall energy costs.

5.High strength,long life

Si3N4 or Sialon/Syalon keeps its original strength even at high temperature of up to 800°C. lts corrosion resistance and excellent strength characteristics permit a relative thin wall in thickness of the products，making it easy to handle and operate, and for maintenance and replacement.