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750C Hermetic, Optical Window Design

750C Hermetic, Optical Window Design

750C Hermetic, Optical Window Design


  In my research, I will be photographing droplets resting on horizontal surfaces inside a steel well in a furnace running at 750C (1400F), though I may later wish to raise the temperature by a few hundred degrees celsius.

  To permit imaging, I require an approximately 10-13 cm (4-5") diameter by 2-5 mm (1/8") thick window in the side of the well (open-topped, stainless steel, cylinder, 15 cm (6") diameter, 6.5 cm (1/4") thick walls) that can withstand these temperatures, while remaining hermetically sealed (during later experiments, we will be sealing the top of the well and running a chlorine atmosphere).

  As the well is a cylinder, the simple flat, bolt-on type windows I have seen in appropriate sizes do not seem as though they could be modified to work, and most do not meet my temperature requirements.

  I was thinking if it would be possible to buy a window (i.e., quartz) hermetically sealed to a ring of metal which I could then weld or screw onto a (threaded) fixture previously welded to the well wall (i.e., a cylindrical tube open at both ends, with one end welded to the well and the other to be attached to the window assembly).  If the threaded design were pursued, I would also require an appropriate sealant.

I am interested as to possible window designs or any suggestions or information that would be suitable, as well as being low cost (i.e, < CAN$500 (~US$380), excluding labour).  

Thank you for your time.

Auf wiedersehen,


RE: 750C Hermetic, Optical Window Design

Quarz seems to be OK, I don'r see the need of hermetic seal -- a small leakage is OK, just add a ventillation
( you can flush down the drain is with a water injection pump)

<nbucska@pcperipherals DOT com> subj: eng-tips

RE: 750C Hermetic, Optical Window Design

I meant Ventury pump, operated with water...

<nbucska@pcperipherals DOT com> subj: eng-tips

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