TCE Uranium glass

Coincidentally, I just asked about the expansion coefficient of uranium glass on a materials newsgroup but haven't seen the replies yet. The Apparatus Drawing Project has shop drawings for a Balmer Series Spectrum Tube and says to use a bead of uranium glass to attach the tungsten rod to pyrex for the electrodes. Oddly enough, the CRC book (64th ed) doesn't have the information, nor does Strong's Procedures in Experimental Physics.

My interest is in artwork and the 480C working temperature for glass to metal seals. "Geissler tubes" and "depression era" glass. Some time on google didn't yield results. Corning and Kimble sites did not have any useful data. 7740 glass is a boro glass with some(1%)? dopinging of uranium. Are you a glass blower/scientific glass fabricator. Uranium glass also used in fabricating tubes of years gone by.

boer

This site

I second that, Email or better yet, call them and ask to talk with someone for some "technical information" They're usually willing to help.

There some good scientific glass blowing books out there. But they're out of print. You can sometimes find them at University libraries.

My favorite was written by Wheeler. Not sure of the date.

I have a copy of "The Glass Engineering Hand Book by Shand. 1958" He was a Corning engineer. It states the following

Corning # 3321 as hard green sealing glass. CEO 0-300 degrees C 40 x 10-7 Strain point 495 c Annealing point 540c Softening point 780c

We usually use uranium as an intermediate on tungsten to boro seals. There's a bit of a trick to do it right. You need to clean the tungsten and oxidize it prior to sealing. Is there a specific metal you're trying to seal?

Randy Hansen SC Glass Tech Scam Diego, Comi-forna

Thanks Mike. Do you know if any artists are fabricating geissler tubes? My interest is to combine phase gratings and high frequency for displays. I also desire to see if this glass can be supplied as a bead for glass to metalseals in a uhv vacuum application.

Thanks, boer

Thanks for the info Randy. I am looking to seal DuPont LCCC ceramic(layered laminated green sheet) to tungsten or moly wire as electrical feedthroughs for a uhv application. Our uhv vacuum boyos are strict on the materials and processes for the ceramic package. Once again my thanks.

boer

boer