New Class Sialon For Use in Molten Aluminium

Sialon ceramics have found extensive use in non-ferrous molten metal handling, particularly aluminum and its alloys, including metal feed tubes for aluminum die casting, burner and Sialon immersion heater tubes, injector and degassing for nonferrous metals, thermocouple protection tubes, crucibles and ladles.

Sialon ceramics  are produced by first combining a mixture of raw materials including silicon nitride, alumina, aluminum nitride, silica and the oxide of a rare earth element such as yttrium.

With regards to Sialons ceramics, there is substitution of silicon by aluminum with corresponding atomic replacement of nitrogen by oxygen, to satisfy valency requirements.

The resulting ‘solution’ has superior properties to the original pure solvent, syalon, silicon nitride or Si3N4.

In metal forming, it is used as a cutting tool  for machining chill cast iron and as brazing and welding fixtures and pins, particularly for resistance welding.

Other applications include in the chemical and process industries and the oil and gas industries, due to the excellent chemical stability and corrosion resistance and wear resistance properties.

Sialon ceramics  sonotrodes are used for our ultrasonic degassing & grain refinement generator. Tested on an industrial scale, the use of Argon and expensive grain refiners such as TiB becomes obsolete.

As a consequence, degassing boxes such as Alpur, Hertwich and PAE Novelis are not necessary anymore as the Sialon sonotrode is placed in the launder or near the cylinder during DC casting of molten aluminium.

We are the leaders in the field of ultrasonic degassing and grain refinement.

Compared to silicon nitride or si3n4, our new grade isostatically pressed quality, shows superior properties with regards to impact fracture toughness (> 10Mpa)  and thermal conductivity (17-85 W/mK). Our Sialon ceramics are considered to have superior properties over silicon nitride and syalon.

Our heater tubes, thermocouple protection tubes, riser tubes, Westofen dosing tubes, ladles,hooks, extrusion dies, cutting tools and welding pins have excellent non-wetting properties and a smooth surface.

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