Does anybody have experience with Vycor 96% silica tubing in hydrogen at bright red heat, around 750°C, regarding its reduction to silicon monoxide or elemental silicon?

  • $\begingroup$ Sounds very interesting. A cursory search via sciencedirect showed some results on stuff adsorbed to porous Vycor glass or on CVD using Vycor carriers, but unfortunately nothing seemed relevant to your question. I only got in touch with Vycor when using an old Gräntzel low-pressure mercury lamp - the transmission at 254 nm is ~ 75%. Unless I miss something, the treatment described in your question isn't related to the manufacturing process. So, the chance to get some useful information from Corning probably isn't very high here. $\endgroup$ – Klaus-Dieter Warzecha Apr 10 '14 at 22:14
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    $\begingroup$ It is a consolidated fused Vycor tube, it should be inert, and it isn't. Engineering said "it is supposed to work." "It is supposed to work" is a fulfilled task on a PERT chart. Management being what it is, I'm hoping somebody has been here before. It is not where it can be easily replaced. $\endgroup$ – Uncle Al Apr 10 '14 at 23:16
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    $\begingroup$ christycatalytics.com/Portals/55271/docs/… It's a start but not quite an answer. Lowering my temp, consistent with the application, should help. $\endgroup$ – Uncle Al Apr 12 '14 at 15:01
  • $\begingroup$ One can flow hydrogen through pure silica furnace tubes at 1000C just fine. However, I don't know what all else is in Vycor... $\endgroup$ – Jon Custer Oct 15 '18 at 13:41