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 * 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 > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean.