Nixie and Magura do Heatsink Material

[Nixie]

Even beryllia is safe once cut and clean. I've yet to find a better way to mount devices on heatsinks.

 

[maxro]

Even beryllia is safe once cut and clean. I've yet to find a better way to mount devices on heatsinks.

'Tis called the "isolated package".

 

[Nixie]

'Tis called the "isolated package".

Are you smoking something, maxro? The isolated package has a built in plastic isolation. Beryllia, on the other hand, is almost twice as heat conductive as the aluminum of the heatsink itself, comparable to copper instead (while being an electrical insulator). So what's better, the copper-like heat conductivity of beryllia, or plastic? Indeed, the beryllia is even better than a non-isolated heatsink attached directly to a metal-backed part, because it spreads the heat to a larger initial surface of the aluminum.

 

[jean-paul]

The best option seen from an environmental point of view would be the isolated package. When beryllium would be used there will be a time it will end up somewhere in the environment. With a possibility that it ends up in the vicinity of people not knowing the risks.

But people that build such hot amps that really need the beryllia for that last degree difference probably don't care.

 

[Nixie]

Huh? Beryllium comes from the environment. Nothing wrong with it ending up back there, even if it has been oxidized to beryllia.

 

[jean-paul]

Seen like that litterally everything comes from ( and ends up in ) the environment....

http://en.wikipedia.org/wiki/Beryllium

I am glad we finally found a destination for our left-over beryllium.

 

[Nixie]

Send it to me

 

[jean-paul]

I will !

 

[auplater]

toxic stuff

Are you folks for real??

Do you drive a car? There are sooo many everyday hazards out there that noone seems to give a *&^% about, and you're worrying about teflon fumes?

GET REAL!!

I've worked in nuclear reactors, with explosives... with cyanide vats > 1000 gallons... with permanganic/chromic/perchlori acid fumes, HF, you name it... I'm still here.. multi 100KV tesla coils...pipe bombs...

Secret here is... BE CAREFUL!!! Don't do sumpthin stupid...

Not to mention I bult a SPUD GUN that'll launch flaming potatoes 300 meters... ;-)

I worry about alot of stuff... but teflon ...gimme a break... go talk to Al...

John L.

 

[Nixie]

Re: toxic stuff

I've worked in nuclear reactors, with explosives... with cyanide vats > 1000 gallons... with permanganic/chromic/perchlori acid fumes, HF, you name it... I'm still here.. multi 100KV tesla coils...pipe bombs...

But with all these things you take measures to protect yourself. I built a 100 kV X-ray machine in my basement, and I've made anything from abrin to PETN. But continued exposure to low levels of environmental toxicity is much more worse because it's not practical to wear protective gear in everyday life.

 

[auplater]

Re: Re: toxic stuff

But continued exposure to low levels of environmental toxicity is much more worse because it's not practical to wear protective gear in everyday life.

And where's the proof...?? low levels of many of the currently popular politically motivated toxins occur naturally ... always have.. we're just now discovering them (volcanic debris comes to mind) and you can't protect from them.

So much of this "low level exposure" stuff is meta based at best.. I know, I live in the medical field dealing with childhood illnesses and prevention... the data supporting the supposed "toxic cumulative effects" of low level exposure is pathetic. Almost always the purview of contorted politicians jumping on the bandwagon trying to get elected by quoting supposed "expert scientists".

 

[phn]

What bandwagon? What politicians?

You mean those smoking and asbestos alarmists? History sure proved them wrong.

Poor oil companies being bullied by the big powerful environmentalists. Poor tobacco companies. Poor chemical industry. Poor pharmaceutical industry.

 

[maxro]

Are you smoking something, maxro?

mmmmm.... Teflon vapours.

The isolated package has a built in plastic isolation. Beryllia, on the other hand, is almost twice as heat conductive as the aluminum of the heatsink itself, comparable to copper instead (while being an electrical insulator). So what's better, the copper-like heat conductivity of beryllia, or plastic? Indeed, the beryllia is even better than a non-isolated heatsink attached directly to a metal-backed part, because it spreads the heat to a larger initial surface of the aluminum.

I agree, not "better" but "easier". And thermally conductive enough for the chips I hang out with.

Perhaps you could experiment with an all beryllium heatsink and report back.

 

[Nixie]

Perhaps you could experiment with an all beryllium heatsink and report back.

Now you're just trolling. It's too fragile; a copper heatsink is more practical.

 

[maxro]

It can't be that fragile, beryllium alloys have been used for high end bicycle frames. I have no idea what % Be, nor what the other ingredients were.

Sorry about the OT posts.

 

[Nixie]

Beryllia (which is what we're talking about, not beryllium metal) is beryllium oxide, and it's in the form of a ceramic. You cannot make a bicycle frame out of it.

 

[maxro]

You cannot make a bicycle frame out of it.

Likely not. But at half the tensile strength of 6061-T6 Aluminum, it ain't that weak.

Okay, and now back to our regularly scheduled fry pan discussion.

 

[Nixie]

If you hit an aluminum heatsink it will bend; you can still use it. If you hit a beryllia heatink, it will break.

 

[maxro]

Re: toxic stuff

I built a SPUD GUN that'll launch flaming potatoes 300 meters... ;-)

My step dad lost a kidney due to a potato pistol fight when he was a boy. Well, an unsuccessful leap over a picket fence was involved....

 

[454Casull]

Likely not. But at half the tensile strength of 6061-T6 Aluminum, it ain't that weak.

Okay, and now back to our regularly scheduled fry pan discussion.

You're really stretching. If tensile strength was the only measure of strength, we could build the frames from resin-free carbon fibers.

We can't, by the way. It would just be limp like a rope.