We have a 1700 degrees centigrade tube furnace with alumina tube. we have sealed the tube and we use silicon rubber to seal it, But after 2 or 3 runs the silicon rubber melts. we have also bought the sealing equipment due to the suggestion of furnace company, but after using the furnace at 1400 degrees with nitrogen atmosphere, the alumina tube fractured, the company says it's the problem of cold gas running through the tube but I don't think that's a problem. Do you have any suggestions what is wrong with the sealing and why the alumina tube fracture in this condition? Is there a problem with the nitrogen gas?
madam as per my knowledge , i suspect that you should reduce pressure of N2 gas flow.
in red-hot condition alumina or silica tubes are very much sensitive to mechanical vibrations and high pressures so this may also leads to cracks formation take care of tht also,
next one i suggest is if nitrogen gas come out from the cylinder is too much cold may cause quenching of red hot alumina or silica tube, but this might not major issue according to me.
last option is ask for further more high qulity more temperature range... and replace in the place of old tube.
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