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Don, Yes, I am using a double port baffle box that has a single 1/2" discharge port out the side. The 1/2" hole is really a little 1/2" dia well about an inch deep. The SiO gas would be coming out of

I can't tell from your picture but are you using a "baffle box" source? You can determine the distribution from the source by using a material that sublimes (doesn't melt and wet) such as chromium

Hey guys, It has been a long road but I finally have all the pieces of my SiO over-coater set up and running at once in the 1.5 meter chamber. Commercial Tantalum box ( from Leskers ) with 280 amps x

'Strong' was written about 1938 and covered pnysics department practices at Caltech at that time. Very widely respected book and there really isn't a modern equivalent. A lot of his stuff on

Jarvis, I have that book somewhere. I will look for it again. But the fix for me is to warm up the coils a little then turn them up to high and melt the aluminum onto them. I have tried it many ways

Drew, in a previous reply I suggested that you get a copy of "Proceedures in Experimental Physics" (attached).? That advice still applies.? If you can't find a copy, I can copy the appropriate pages

Well, the problems I was having were all thermodynamic in nature. My little 500 BTU per hour water chiller simply could not take out the 6000 BTU's / hr that the diff pumps were putting into the water

Andrew, see if you can get a copy of "Proceedures in Experimental Physics" by John Strong.? Originally published by Prentiss-Hall and later reprinted , I think by Willmann-Bell.? While no longer in

Don, I am always looking for vac feed thru. May I inquire what fittings you have ??? Pre-melting the aluminum in vacuum in a separate vacuum run is just too much effort. I have to let my chamber sit

Tungsten coils break because they crystallize on heating and become brittle. Limiting heating (and time) makes the coils last longer. A general problem with evaporation from a filament or boat is that

Don, I don't have the ability to shutter all the coils so can you describe what a cleaning with an oxidizing agent would be ??? Are you describing a final cleaning of the coils with a spray with

>When heating tungsten filaments to evaporate aluminum the first thing that is vaporized is the tungsten oxide. This is why you either need to strip the oxide off (electropolising or by chemical

Precisely! ? Guy Brandenburg, Washington, DC? http://gfbrandenburg.wordpress.com/ http://home.earthlink.net/~gfbranden/GFB_Home_Page.html ============================

thanks for the tip. So slowly on the current so the coils have a chance to heat up the aluminum and never got to bright glow till they are aluminum coated.

Andrew, Try ramping up the current and voltage very slowly on your tungsten filament in the future. Take nearly a minute to reach full current. It worked for me; it might possibly work for you. Guy

That is very clever actually. Reverse electro plating. I too ran into overly stuck on coatings this weekend. I almost have my chamber back up and working but the pressure is still a little to high.

Hi All, I just would like to share some experience about these. Thank's for Vladimir I made the triangle glow discharge cleaning cathode as he described in his pdf file. And it seems the Al passed

Hi! I put a file to the files section diffusion pump. This is an invention what I accomplished on the last week. The main problem was with my DP, its pumping speed was low 220l/sec. Not enough to

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the VacuumX group. File : /Diffussion pump/US3363830.pdf Uploaded by : schneyolo

Attila, I absolutely agree with Don Mattox - nothing to add... Just be also careful with HF!!...:-) Regards, Vladimir