Re: Magnetron sputter system
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?ARRRRRGGGGGGGGG ?this electrical stuff makes no sense.? Copper is from like back in the Jurassic period and is good...... stainless steel is from the space age and is bad. ? ?
My reading has brought me to realize that stainless steel is a serious "no no" in high current flow efforts.? I now have a 14 item list of things to replace in my system so that I can increase the current flow to the tungsten coils and tantalum box heater.?
I have not given up on magnetron sputtering but I have a far better chance of making gaseous silicon monoxide with the tantalum boat heater than with a ( yet to be designed or built ) magnetron sputtering system.? So while I explore the unknowns of HV magnetron plasma deposition offline in a small vacuum chamber, I will be trying to make the little tantalum box glow white hot in the big chamber.? My vintage 1970's thin film measurement and process controller can run either concept once I figure out how to get it working. ?
Now that I know mister copper is my friend, what could possibly go wrong :_))))))))))) ?
Drew in sunny Florida
On Wed, Nov 5, 2014 at 3:42 PM, Andrew Aurigema <eosraptor@...> wrote: Well I looked up the specs for the tantalum box and it is 257 amps at 1.4 volts requiring 360 watts.? I have 12 vac at 500 amps available so I presume I have enough power.?
I also looked up the current carrying capacity of the 3/8" dia steel threaded rods that make up the pass thru's.? It was very much less than it needed to be.? So I will be changing out the two 3/8" steel rods for two 1/2" copper rods and between the two parallel pass thru's I should have a true 500 amps rated capability.? I am also stepping up to 4 each power feeds leading to the tantalum box and 4 each leads going to chamber ground.? Each lead should be 90 amps so that is 360 amps of capability leading to and exiting away from the box. ?
The main feeds to the pass thru's are 3/4" copper stranded cable so that is 500 amp plus. ?
Along with cleaning up all contacts and eliminating all stainless steel conductors in the system I think the next time I power the system up it will glow white hot only where it is supposed to and not along the path. ?
This electricity stuff is nearly as tricky as vacuum. ? ? ??
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