They might also provide help:
http://www.ccl.fraunhofer.org/working_areas/technologies/technology_03/e_surface.php
(at Michigan State University, East Lansing, Michigan 48826-1226)
Diamond-like carbon is chemically inert in comparison to many other materials. This is especially true for hydrogenated amorphous carbon a-C:H (most commercial DLC), as the carbon "dangling" bonds will be saturated by hydrogen.
Problems will rather arise in case the coating has pin holes, which...
The load density will certainly have some effect on the coating processus.
Also, the other parts might not be as well cleaned as yours. This may affect your parts, if something is vaporized in the vacuum chamber and reaches the surface of your parts.
Actually, the quality of the bonding doesn't depend so much about the deposition method. It's the design of the interface an the parameters used that are important. Often, metallic interlayers are used without being mentioned by the manufacturer.
It should be no problem to deposit a-C:H on...
Thank you very much! :)
Currently we are cleaning with our washing machine and an ultrasonic caustic bath, though this process is far from perfect.
For the most soiled machine parts, our project partner does the cleaning, so we have only to remove the surface oil for conservation.
Thank you.
We wash the parts in deionised water before we dry them and put them in the vacuum chamber, wherer they are plasma etched. On most steel parts, the coating adheres well.
It seems really to be a problem with surface embedded residues from mechanical processing. This grinding medium...
E.g. we have 16MnCrS5 parts. It seems to be a problem concerning embedded oil in the surface because of the surface grounding process.
Thus I started a similar thread in the Materials Engineers / Paint/Coating engineering forum.
Thank you for the reply.
With clean steel parts we don't have problems.
With ground 16MnCrS5 (e.g.) surfaces we do.
I suppose embedded oil from the grinding process is the problem. Oxide layers should be removed by our plasma etching.
We do PVD coating.
Hello!
Can anybody give me some advice on cleaning?
In case of some extremely oily, greasy or otherwise soiled engine parts with rough surfaces, my coatings keep peeling of after deposition.
I have tried cleaning with benzine, an industrial washing machine, ultrasonic baths and different...
Hello!
Can anybody give me some advice on cleaning?
In case of some extremely oily, greasy or otherwise soiled engine parts with rough surfaces, my coatings keep peeling of after deposition.
I have tried cleaning with benzine, an industrial washing machine, ultrasonic baths
and different...
