silicon nitride heater and riser tubes

Silicon Nitride Heater and Riser Tubes

STA manufacture a range of advanced ceramic silicon nitride immersion heater and riser tubes for use in the aluminium and non–ferrous molten metal handling industries. Fine silicon nitride foundry products offer long life, improved process reliability and are cost effective compared to competitive materials, such as cast iron and refractory ceramics, such as silicon carbide and aluminium titanate. STA Si3N3 is an alloy of silicon nitride and combines excellent thermal and mechanical properties.

STA Si3N3 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–sticking nature in contact with aluminium and its alloys.

Immersion heater tubes are the most effective method of heating the melt in the aluminium processing industry. STA Si3N3 tubes offer protection to heating elements due to its excellent physical properties.

The range of heater/riser tubes available is very diverse, although we are limited to a maximum outside diameter of 200mm and maximum length of 1500mm. A selection of the tubes we currently manufacture are shown in the tables below. Other tubes can be manufactured to customer requirements. Integral flanges can be made up to 30mm greater than the tube outside diameter.

Standard Sizes—Heater & Riser Tubes

OD/mm   ID/mm    Maximum Length/mm   Integral Flange      Steel Flange

60    50    1500       Max. length 1000mm    √

80    60    1500       Max. length 1000mm    √

100  80    1500       Max. length 1000mm    √

120  100  1500       Max. length 1000mm    √

140  120  1100       Max. length 1000mm    √

160  140  1100       X     √

170  150  1100       X     √

190  165  1350       X     √

Please contact us for more information on molten metal handling applications of silicon nitride ceramic foundry products.