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I have been messing up coatings a lot this week ( dialing in a new transformer ) so have been stripping them back off and analyzing the results.?
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First off, I have noted that the coatings are massively stuck on.? I mean they are stuck on 10 times more than I normally see.? I have also noted that there is a bluish black soot like stuff seriously stuck to the glass.? I am guessing this is some form of tungsten from the emitters that are not heating correctly. I am having a lot of problems making aluminum thickness happen right now.? It could be from the vacuum not being deep enough or from the coils not heating up enough. ?? This dark layer of ( something tungsten ) is being over coated by the aluminum.? The soot layer is very thin ( like a few tens of nanometers ) but it is welded to that glass.? It is not taken off by the stripper.? The aluminum is dissolved away instantly by the copper sulfate based stripper leaving this dark film on the glass surface.? The film comes off with a weak solution of CeO and wiping but it takes several iterations to get it fully removed. ? This soot is just like the stuff that my plasma discharge system made.? I don't run that system right now because of the soot it used to make.? But maybe that soot is part of good adhesion.? I am pretty sure once I get my transformer dialed in I will stop making this soot and go back to my normal adhesion of the aluminum.? I just wanted to mention it and see if anybody has an idea what it is and maybe if it is a low tech solution to better adhesion.? Maybe if we figure out exactly how to make a uniform thin layer of this dark coating it could be the first thing deposited on the glass.? It really does seem to increase the adhesion of aluminum to the surface. ? Drew in sunny Florida ------------------------------------------------------------------------? On Thu, Sep 15, 2011 at 9:53 PM, Vladimir Chutko <chutko@...> wrote:
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