Re: What is this soft metal, and is it toxic?
Hi:
Is that for plasma cleaning...like burning off organic material, using oxygen gas plasma?
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Re: What is this soft metal, and is it toxic?
hi:
Indium... at least mostly pure Indium (not an allow) is very shiny...it doesn't tarnish in air... they used to use it for the reflectors in headlights. At room temperature, it is soft, and it cuts¡ but, it isn't sticky. It also cries when you bend it.
There are Indium/lead solders, for soldering to gold...and alternative to tin/lead that leeches the gold plating.
Also, I seem to recall, Indium...or Indium/Gallium alloys wet glass, and leave a mirror like surface.
They use Indium in vacuum gaskets; but, usually those are shaped like O rings, or like copper gasket on spark plugs... the Indium flattens and seals under pressure.
Anyway, Indium won't melt in boiling water.
You can do a flame test... usually its a paste of the metal sample and hydrochloric acid, dipped onto a platinum wire, in a non-luminous flame...like a propane torch flame... natural gas in the lab.
Pure Indium isn't known to be toxic; but, the solder alloys (with lead) probably are.
I've seen rubber (Buna), fluoropolymers, silicone rubber, Teflon, gold, copper, and Indium gaskets, in vacuum systems.
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Re: What is this soft metal, and is it toxic?
in the implant refurbish business we used an elastomer for the platens. Under some conditions it turned hard, some other materials were indium. depends on who made the platen and when. contaminated- most likely not, although depends on the ion being spewed......just use gloves and do not breath the stuff. masks not necessary.
¸é±ð²Ô¨¦±ð
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On 2018-12-02 3:20 p.m., Chuck Harris wrote: Why do you think it is metal? Is it shiny in a way
that doesn't show in the pictures?
If it is the black stuff, looks like epoxy.
If it is the white stuff, looks like silicone heat
sink compound.
-Chuck Harris
John Griessen wrote:
It's parts of a plasma etcher that are in the high vacuum area. The ceramic plate
had wafer lifting pins and was bonded
to a thick aluminum plate with low temp metal brazing.
I can gouge it easily at a temperature of 60 deg F and the tool feels sticky. A push
and twist captures the tool and holds its
cantilevered weight.
Could this be Woods metal? Gallium? Toxic Mercury Cadmium Lead amalgam?
I am thinking it must have been stable in vacuum with some warm temperatures when the
etcher was running...
.
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Re: What is this soft metal, and is it toxic?
hi
you could try to dissolve, or soften at least, a little bit of it in kerosene, WD-40, or contact cleaner¡ some kind of organic solvent. If it softens but doesn't all dissolve, it is some kind non-metallic material, with maybe a metal filler...like heatsink compound.
If it is Wood's metal, or Gallium, it is going to melt pretty quickly in boiling water...or near boiling water. Basically, it will look like a little blob of mercury, at those temperatures. (Don't heat it directly...see below!)
Different amalgams of mercury, have different physical properties. Mercury lead can form a brittle solid.. about the composition of a cookie. Mercury cadmium is similar. But in plastic, or pasty form (lots of liquid mercury in the mix)¡ I don't recall them being sticky.
If it is an amalgam... as long as you have ventilation, don't smear it on your skin... or especially don't eat it or heat it strongly so the metal boils... then you should be fine. The solid or liquid forms of these metals/amalgams have low vapor pressures, unless you strongly heat and boil them. The vapor/gas is very dangerous, when inhaled.
If its an amalgam, sweep up, or shovel up any contaminated areas, without raising dust...into a doubled up clear plastic bag(s)¡ and dispose of it as you would batteries (how every you do that locally.)
If its organic...like thermal paste...it could have a metal filler like aluminum, or silver; but, I don't think they use cadmium, or mercury amalgams for fillers.
I'm not sure how to dispose of thermal paste... other than to dispose of it the way you do solvents and paint.
I guess, if one doesn't want a toxic surprise, and is scrapping, or recovering parts from scientific, medical, or industrial equipment, it might pay to know what to expect.
My neighbor smashes microwave oven magnetrons, for the aluminum, even though I told him berylliosis is very serious.
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Re: What is this soft metal, and is it toxic?
Indium solders just about anything that can stand the
temperature. It is commonly used to solder glass to glass,
in lasers. It also solders glass to ceramic, and ceramic
to a variety of metals.
Because it is soft, putty like, it gives a little, and
accounts for variations in expansion rates of different
metals.
AFAIK, it is not poisonous, as it is commonly used in the
alloys used in dental crowns. Its vapor pressure is very
low, with its boiling point being over 2000C.
-Chuck Harris
Daniel Koller via Groups.Io wrote:
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Yeah, and now I eat crow because I didn't actually fully *read* the original post before I answered it and tried to be helpful. I bet Chuck is right - Indium is commonly used in vacuum environments. It's a good gasket material (RF and vacuum gaskets in a pinch).
There's an awareness about Cadmium that is likely to have prevented its use in anything more modern (last 20 years of so?). Lead is a no-no in high-vacuum systems. I has a high vapor pressure. You don't even use brass since the lead will outgass at temperature.
How was the indium (or whatever it is) bonded to the ceramic? Try melting it on a hot plate to determine its melting point and maybe scrape up enough to measure specific gravity.
Don't rule out bismuth or tin either. Try a flame test. I just googled Indium (Flame Tests) and found this:
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Re: What is this soft metal, and is it toxic?
Yeah, and now I eat crow because I didn't actually fully *read* the original post before I answered it and tried to be helpful.? ?I bet Chuck is right - Indium is commonly used in vacuum environments.? ?It's a good gasket material (RF and vacuum gaskets in a pinch).
? There's an awareness about Cadmium that is likely to have prevented its use in anything more modern (last 20 years of so?).? Lead is a no-no in high-vacuum systems.? I has a high vapor pressure.? You don't even use brass since the lead will outgass at temperature.? ?
? How was the indium (or whatever it is) bonded to the ceramic?? ?Try melting it on a hot plate to determine its melting point and maybe scrape up enough to measure specific gravity.??
? Don't rule out bismuth or tin either.? Try a flame test.? I just googled Indium (Flame Tests) and found this:
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Flame Tests
Dave Barthelmy
Listing of Flame coloration which can be used to identify elements in minerals.
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The element?Indium?is named for the prominent blue lines in its spectrum.
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On Sunday, December 2, 2018, 10:57:55 PM EST, Chuck Harris <cfharris@...> wrote: <> -Chuck Harris John Griessen wrote:
It's parts of a plasma etcher that are in the high vacuum area.? The ceramic plate
had wafer lifting pins and was bonded
to a thick aluminum plate with low temp metal brazing.
I can gouge it easily at a temperature of 60 deg F and the tool feels sticky.? A push
and twist captures the tool and holds its
cantilevered weight.
Could this be Woods metal?? Gallium?? Toxic Mercury Cadmium Lead amalgam?
I am thinking it must have been stable in vacuum with some warm temperatures when the
etcher was running...
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Re: What is this soft metal, and is it toxic?
<>
-Chuck Harris
John Griessen wrote:
toggle quoted message
Show quoted text
It's parts of a plasma etcher that are in the high vacuum area. The ceramic plate
had wafer lifting pins and was bonded
to a thick aluminum plate with low temp metal brazing.
I can gouge it easily at a temperature of 60 deg F and the tool feels sticky. A push
and twist captures the tool and holds its
cantilevered weight.
Could this be Woods metal? Gallium? Toxic Mercury Cadmium Lead amalgam?
I am thinking it must have been stable in vacuum with some warm temperatures when the
etcher was running...
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Re: What is this soft metal, and is it toxic?
Oh, sorry.? I missed this message which provides the context I was looking for.? ?I can't think of any reason one would build a plasma etcher out of something that is particularly toxic, BUT, I would be more concerned about what someone could etch in a plasma etcher.? Gallium Arsenide comes to mind.? But looking that up now on Wikipedia, it's debateably carcinogenic.? ?Just the same, I wouldn't play scratch and sniff with the stuff.? ?Wash your hands really well, and try not to inhale anything as you chip away or grind or sand.? Better yet, wear a mask.? ?
None of the soft heavy metals and going to kill you instantaneously.? ?You'll just have to get them recycled properly.? ?You can burn a chip of the stuff to see if it melts or burns at a low temperature to try to identify it.? Definietly don't breath those vapors.
First guess, without knowing more about this system is that it's some sort of a protective alumina/ceramic plate glued onto the aluminum cover plate of the etcher, to protect if from etching.? ?Just a guess.? You can measure the density of the metal plate once you clean it up.
? Dan
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On Sunday, December 2, 2018, 3:17:09 PM EST, John Griessen <john@...> wrote:
It's parts of a plasma etcher that are in the high vacuum area.? The ceramic plate had wafer lifting pins and was bonded
to a thick aluminum plate with low temp metal brazing.
I can gouge it easily at a temperature of 60 deg F and the tool feels sticky.? A push and twist captures the tool and holds its
cantilevered weight.
Could this be Woods metal?? Gallium?? Toxic Mercury Cadmium Lead amalgam?
I am thinking it must have been stable in vacuum with some warm temperatures when the etcher was running...
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Re: What is this soft metal, and is it toxic? OT
Context needed.? ?What is the larger view of the part?? Where did it come from???Any date information, lab stickers, anything that might indicated what its function was?
? Dan
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On Sunday, December 2, 2018, 7:26:14 PM EST, John Griessen <john@...> wrote: On 12/2/18 5:20 PM, Chuck Harris wrote: Why do you think it is metal?? Is it shiny in a way
that doesn't show in the pictures? I guess the photos seemed more like reality right after I took them, but now that I review, they do look flat and like epoxy or caulk... I annotated the same photos, which were done in bright sun. -- John
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Re: Viewing hood part number for 7000 series scopes
Dennis: I am interested in purchasing your viewing hood for 7000 series Tek scopes for $20 plus $15 for shipping. How can I go about doing this? Gary Gary Bosworth 139 E. Shrode Street Monrovia, CA 91016 On Sun, Dec 2, 2018 at 11:54 AM Dennis Tillman W7PF <dennis@...> wrote: Hi Gary,
If you're looking for one of these I have one I don't need.
You can have it for $20 + $15 shipping instead of the $50 + $30 shipping
this one is listed for.
CONTACT ME OFF LIST if you (or anyone else) wants it at dennis at ridesoft
dot com.
Dennis Tillman W7PF
-----Original Message-----
From: Glydeck via Groups.Io
Sent: Saturday, December 01, 2018 11:38 PM
Subject: Re: [TekScopes] Viewing hood part number for 7000 series scopes
There is one on eBay
/332196485087
On Dec 1, 2018, at 8:51 PM, John Griessen <john@...> wrote:
On 12/1/18 10:11 PM, Gary Robert Bosworth wrote:
My manuals do not list a part number for the viewing hood for any of my 7000 series oscilloscopes.
016-0154-00 is the Batman version -- pictures tomorrow...
--
Dennis Tillman W7PF
TekScopes Moderator
-- Gary Robert Bosworth grbosworth@... Tel: 310-317-2247
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Large lot of Tek equipment for sale
I have no affiliation with the seller, but he has a lot of equipment (Tek) for sale via Craigslist, located about midway between Washington DC and Baltimore MD (USA):
Mike Dinolfo N4MWP
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Re: What is this soft metal, and is it toxic? OT
On 12/2/18 5:20 PM, Chuck Harris wrote: Why do you think it is metal? Is it shiny in a way
that doesn't show in the pictures? I guess the photos seemed more like reality right after I took them, but now that I review, they do look flat and like epoxy or caulk... I annotated the same photos, which were done in bright sun. -- John
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Re: Tektronix Blue paint - source in the UK ??
Phone them. Like I said.
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I have tried looking on the Paints4U web site and used their search facility looking for Tektronix
with
no success. Do you by chance know what they called the paint that they supplied to you.
Thanks for your patience.
73 George G6HIG
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Re: Tektronix Blue paint - source in the UK ??
Hi Craig I have tried looking on the Paints4U web site and used their search facility looking for Tektronix with no success. ?Do you by chance know what they called the paint that they supplied to you. Thanks for your patience. 73 George G6HIG ? On Sunday, December 2, 2018 11:47 PM, Craig Sawyers <c.sawyers@...> wrote: >? Sorry, I must have missed that thread.? I'm in Cambridge UK, and might be interested in a can (if there's any left) to fix up my 2245A which is looking a bit sad.? Let's talk by email:
brian.cockburn.1959
at gmail.com
? Thanks, Brian. Sorry Brain - used it all myself in the end. Phone Paints4u - they have the recipe they developed for me. Craig
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Re: Tektronix Blue paint - source in the UK ??
Sorry, I must have missed that thread. I'm in Cambridge UK, and might be interested in a can (if
there's any left) to fix up my 2245A which is looking a bit sad. Let's talk by email:
brian.cockburn.1959
at gmail.com
Thanks, Brian. Sorry Brain - used it all myself in the end. Phone Paints4u - they have the recipe they developed for me. Craig
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Re: What is this soft metal, and is it toxic?
Why do you think it is metal? Is it shiny in a way
that doesn't show in the pictures?
If it is the black stuff, looks like epoxy.
If it is the white stuff, looks like silicone heat
sink compound.
-Chuck Harris
John Griessen wrote:
toggle quoted message
Show quoted text
It's parts of a plasma etcher that are in the high vacuum area. The ceramic plate
had wafer lifting pins and was bonded
to a thick aluminum plate with low temp metal brazing.
I can gouge it easily at a temperature of 60 deg F and the tool feels sticky. A push
and twist captures the tool and holds its
cantilevered weight.
Could this be Woods metal? Gallium? Toxic Mercury Cadmium Lead amalgam?
I am thinking it must have been stable in vacuum with some warm temperatures when the
etcher was running...
|
Re: Tektronix Blue paint - source in the UK ??
Hi Craig, I went through precisely this exercise in the UK and sourced
Tek blue paint, with the right degree of mattness, matched
from a colour sample sprayed with paint from Tektronix.
I even bought a load of the stuff in spray cans with the offer to
sell it to guys just like you - and got very little response. Sorry, I must have missed that thread. I'm in Cambridge UK, and might be interested in a can (if there's any left) to fix up my 2245A which is looking a bit sad. Let's talk by email: brian.cockburn.1959 at gmail.com Thanks, Brian.
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Re: Tektronix Blue paint - source in the UK ??
Thanks for the tips - there is a local "auto paint matching" service that I will try, though if the
minimum
quantity is a gallon it's gonna be donkey's years before I use it all !!
BTW I did search the group.io but was unable to find much re the UK - perhaps it was lost in the
"clutter" ;-)
Dave Paints4u! I'll say it again - Paints4u. Paints4u. They have the formulation, you don't have to buy a gallon. They supply it in spray cans or in a can along with a can of thinner if you want to use a spray gun. Last time I'm going to say that. I'm done on this topic. Craig
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Re: 7854 readout and stored waveform jitter
I can believe that if the LF13333N is going flakey that the display might jitter some, it's used to switch between sweep and digital signals.
Dave
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of fred@... Sent: 02 December 2018 21:20 To: [email protected]Subject: Re: [TekScopes] 7854 readout and stored waveform jitter Hi Fred, Look up the part numbers for U620 and U1720 in the service manual. Then we can check the Tek Semiconductor Common Parts Catalog and find out what they are. Dennis Tillman W7PF Hi Dennis, I know the part numbers: LF353 and LF13333, I just don't have any of these. -- Best regards, Fred S.
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Re: 7854 readout and stored waveform jitter
Hi Fred,
Look up the part numbers for U620 and U1720 in the service manual.
Then we can check the Tek Semiconductor Common Parts Catalog and find out what they are.
Dennis Tillman W7PF
Hi Dennis,
I know the part numbers: LF353 and LF13333, I just don't have any of these.
--
Best regards,
Fred S.
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Gary Robert Bosworth
Mike Dinolfo
Brian Cockburn
David C. Partridge
Fred S.