STA sialon silicon nitride dosing tubes have a best quality in high temperature. We manufacture dosing tubes for both Striko and Westomat dosing furnaces.
silicon nitride Striko Westomat dosing tubes dosing tubes offer a superior service life compared to Aluminium Titanate (AlTi) dosing tubes, which means considerably less downtime for manufacturing.
With regards to Sialons, 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.
Silicon Nitride like 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 immersion heater tubes, injector and degassing for nonferrous metals, thermocouple protection tubes, crucibles and ladles.
Considerably stronger than Syalon or Silicon Nitride.
Excellent non-wetting properties.
12 months warranty against chemical attack.
Standard tolerance of +/- 0,5 mm.
Striko or Westofen dosing furnaces.
Silicon nitride ceramic material with high thermal stability ,antioxidant ability,and product size excellent performance. Reaction bonded silicon nitride is made by direct nitridation of a compacted silicon powder, and because of the difficulty of ensuring complete reaction; it is hard to achieve a high component density. Usual densities are in the range 2.3 – 2.5g/cm3 compared with 3.29g/cm3 for gas pressured sintered silicon nitride. The higher density gives the HPSN, SSN & GPS-SSN materials better physical properties and means they are used in more demanding applications at very high temperature, especially for non-ferrous molten metal handling and thermocouple sheaths. The nitridation produces only a small volume change, which means that RBSN components do not need to be machined after fabrication and complex near net shapes can be produced in a single process stage.Key PropertiesApplications exploit the following properties of silicon nitridelow densityhigh temperature strengthsuperior thermal shock resistanceexcellent wear resistancegood fracture toughnessmechanical fatigue and creep resistanceExcellent non-wetting property with good oxidation resistance
SSN GPS-SSN HPSN RBSN
3.28 3.30 3.23 2.5
Young’s Modulus (GPa)
285 320 315 189
Bend Strength (MPa)
675 750 850 440
Fracture Toughness K1c (MPa.m0.5)
6 7 8 2.5
16 16 16 7.2
Thermal Expansion Coefficient (x 10-6/°C)
3.2 3.2 3.2 3.2
Thermal Conductivity (W/m.K)
25 30 30 14
Maximum Temperature (°C) for applicationDielectric ConstantAbrasive Wear resistance Parameter
1150 1150 1150 11009 9 9 7.51110 1130 1120 360
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