With StrikoWestofen’s newly developed mobile heating station, ceramic components of dosing furnaces can now be heated up directly on site. As a result, riser tubes, filling funnels etc. can be carefully heated to the ideal temperature of 400ºC right before use. Until now, this crucial process has often been performed incorrectly using improvised set-ups, simply because the market did not offer any well-designed technical solutions to the problem. Not only did this put the integrity of the ceramics at risk, it also compromised the safety of foundry workers.
It’s a phenomenon we are all familiar with: when a teapot kept in a cold place is hit by briskly boiling water, the ceramics crack. This is known as “thermal shock” - an abrupt change in temperature that leads to mechanical tensions between the part of the material which is still cold and the part which is already hot. Cracks are the result.
The same applies to ceramic components in dosing furnaces, such as riser tubes or filling funnels, and it is why they should be carefully pre-heated before being used in or on the furnace. However, this heating process is currently often carried out using inappropriate methods, causing more damage than the pre-heating is supposed to prevent.