Originally Posted by AphexDreamer
When you push the heat sink on the dot of IC Diamond it spreads. That is one source of movement. Another source might be from the liquid getting hot. Atoms move around faster when they are heated, but I don't know if that would be enough to cause micro scratches like that. They even recommend to do that for proper application and mention a break in period which occurs afters the liquid gets heated up so it can spread better.
IC Diamond has an MOHS hardness of 10 Aluminum oxide MOHS of 9 Diamond is harder but only incrementally so
Aluminum oxide the preferred abrasive for etching glass and is used in AS5,Shin Etsu, Mx-4 etc. and would be causing wholesale slaughter of IHS serial numbers with an MOHS of 9 and similar particle sizes.
Nothing is going to move if your sink is tightened down properly, your describing physics that doesn't exist unless your sink is flapping in the breeze.
It is surprising to me that so few people do not understand the use of cleaners and solvents. I have watched countless videos of of people cleaning CPU's - they squirt on the cleaner and immediately begin wiping/rubbing vigorously with out giving the solvent enough time to loosen/dilute the grease. except for zinc oxide and LM all thermal grease are a rough equivalent to a 400 to 600 grit sandpaper which is made of aluminium oxide, what they make sandpaper out of.
Scuff marks on the IHS/CPU are most easily identifiable as a rough cleaning like with a fine grit sandpaper and a little solvent.