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Vacuum Rectifiers X-rays report

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radhoo

Mon Jan 31 2011, 05:33PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Proud Mary wrote ...

Photomicrographs now amalgamated into post above - please delete this.

Steve, Grenadier, Patrick, Nah thanks!

Stella, those are some very nice pictures. I'll get back on this with some more tests an ideas somewhere during this week.

hint: you can use the "preview" option without pressing "Reply", the attachments will get saved, but the message not.

Nah

Wed Feb 02 2011, 03:40PM

Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260

I forgot.

Wonderful work!

I will be sure to be tuned in.

Proud Mary

Wed Feb 02 2011, 06:57PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

This getter retaining grille is spot welded to the underside of the heat shield, and from an X-ray source perspective suggests the possible existence of additional elements with their own characteristic radiation to add to the output spectrum mix.

The triangle of material missing at right in this macro image of the heat shield was clipped off for destructive testing.

1296672636 543 FT0 Russian 2x2a Getter Housing Under Heat Shield 1

This image at x40 suggests the presence of a once liquid metal on the lips of the perforations.

Here at x80 I am still not certain if what we are seeing on the perforation lips is metal that once flowed, or just an artefact of the punch perforation process.

Patrick

Thu Feb 03 2011, 06:06AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

In the long long ago, in a Galaxy far away in the San Jose, CA region of the universe, I was a professional NC punch press operator of the Amada Vipros 358, and 558 variety....

What I see in the micrographs looks like chemical artifacts not shearing asssociated with punching, without knowing what the metal composistion is I can't be sure, but I would bet more on there being chemistry (maybe liquid which once flowed) responsible.

Proud Mary

Thu Feb 03 2011, 11:49AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Patrick wrote ...

In the long long ago, in a Galaxy far away in the San Jose, CA region of the universe, I was a professional NC punch press operator of the Amada Vipros 358, and 558 variety....

What I see in the micrographs looks like chemical artifacts not shearing asssociated with punching, without knowing what the metal composistion is I can't be sure, but I would bet more on there being chemistry (maybe liquid which once flowed) responsible.

Oi! Paddy! Get back to your own Event Horizon!

As this isn't my thread, I'll just say that I'm planning a few more metallographic experiments in support of Radu's investigation, with greater attention to sample surface preparation, which I hope will clear up the ambiguity in some of these images.

radhoo

Fri Feb 11 2011, 07:13PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Proud Mary wrote ...

As this isn't my thread, I'll just say that I'm planning a few more metallographic experiments in support of Radu's investigation, with greater attention to sample surface preparation, which I hope will clear up the ambiguity in some of these images.

Feel free to post like this was your thread. After all it was your article on 2X2 that started all of this. If there is anything I should put in the first post, let me know. I'm waiting for some neat tubes to continue this thread. Should be here by next week.

Proud Mary

Sat Feb 12 2011, 11:50AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

2X2A Crystal formation in getter grill x20

I wonder what these crsytals are. And the white inclusion, third row up from the bottom, third row from the left, that looks to be part of a different crystal system. Could they have formed only once the glass envelope was broken and air was admitted?

And then there's what looks like a piece of wire, partly occulted by the crystals, and which must be some kind of contamination, perhaps at the manufacturing stage. An ultra fine wire it would have to be too.

Funny how I completely missed all this before, but that's what comes from forgetting that it's just as easy to get lost in an infinitely small space as in an infinitely large one.

Proud Mary

Sat Feb 12 2011, 10:29PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

2X2A getter grill single crystal bright field technique x200

1297549429 543 FT0 Getter Grille Crystal X200 Upload

Tentative interpretation: this is a dynamic, evolving system which is still developing.

Krzysztof Penderecki

Patrick

Sat Feb 12 2011, 10:36PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Proud Mary wrote ...

2X2A getter grill single crystal bright field technique x200

Tentative interpretation: this is a dynamic, evolving system which is still developing.

Well maybe its absorbing air/water until extinction. Any idea on the identity of the getter and its molar quantity?

Proud Mary

Sat Feb 12 2011, 11:04PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Patrick wrote ...

Well maybe its absorbing air/water until extinction. Any idea on the identity of the getter and its molar quantity?

Well, it certainly does have a hydrated, water-of-crystallisation look about it, doesn't it?

I'll have to read up about 1940s getter/scavenger practice to guide me in likely directions.

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