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September 2011

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Date:
Fri, 2 Sep 2011 12:46:35 -0400
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JEOL-Focused Probe Users List <[log in to unmask]>
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From:
"Owen P. Mills" <[log in to unmask]>
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JEOL Probe Users Listserver

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Electron Microprobe Lab, University of Minnesota

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*

Brian,

I've noticed that contaminated mechanical pump oil leads to poor quality coatings.  I can tell this is happening in our machine when the bell jar and fixtures take on a blueish coloration.  I change the mechanical pump oil every 3 months or so.

Owen
Michigan Tech University




On Sep 2, 2011, at 11:44 AM, Brian Joy wrote:

> JEOL Probe Users Listserver
> 
> Moderator: Ellery Frahm, [log in to unmask],
> Electron Microprobe Lab, University of Minnesota
> 
> Post a message: send your message to [log in to unmask]
> 
> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]
> 
> On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
> 
> 
> 
> *
> 
> Hi everyone,
> 
> I'd like to ask a question regarding a problem I've been having while
> carbon coating.  I am using a Denton Desk V coater with turbomolecular
> pump and rods consisting of compressed powdered graphite (from Ted Pella,
> 1/8” diameter, grade 1 “spec-pure”).  I can obtain coats of appropriate
> thickness (i.e., between 1st-order red and 2nd-order blue) that look very
> good.  However, after coating polished brass or glass, when I place a drop
> of methanol on the surface of the coat, the coat disintegrates within a
> matter of seconds.  Has anybody seen this sort of behavior before?  I
> assume that it must be due to presence of contamination under the coat. 
> I've checked the inlet to the roughing pump, and I see no oil residue
> after several months of use.  Any suggestions?
> 
> Brian
> 
> 
> -- 
> Brian Joy
> Electron Microprobe and ESEM Lab
> Queen's Facility for Isotope Research
> Department of Geological Sciences and Geological Engineering
> Queen's University
> 36 Union Street
> Kingston, Ontario K7L 3N6
> 
> cell phone: 530-220-0434
> lab phone: 613-533-2595
> fax: 613-533-6592
> 
> -- 
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