07-18-2007, 08:25 PM
Our customer's specification requirements are to have no porosity greater them .0005". This applies to all voids including pullout from sample preparation. We are able to get a very nice coating with 1-2% porosity but I still have a couple of voids greater then the allowable size. Does anyone have any advice? Can the requirement be met?
07-18-2007, 09:48 PM
Sounds rather tight and unforgiving standard. That is one porosiy/pull-out site any larger than 12.5 micrometres and the coating fails. How are you spraying the coatings? Have you tried epoxy resin vacuum impregnation of coating samples for metallography. At least this may reduce accidental particle pull-out. A spec like that must put some pressure on your metallograhers
07-19-2007, 05:28 PM
We are using a 9MC to spray the coating. And yes we will need to vacuum impregnate the coating really well. We normally use hot mounts for this coating, which we spray almost daily to the GE specifications.
07-24-2007, 01:18 PM
Highlighted area in red from these previous posts that may be of interest.
Original thread http://www.gordonengland.co.uk/sef/metal...169-2.html
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