Please could someone suggest that how lower wear rate under higher load can be explained for ceramic specimen under lubricated sliding wear test?
You mean that you have the same roughness as before, same lubrication conditions, same COF, same materials but a lower wear rate?
@Elia: The same condition in terms of roughness and lubrication but COF is slightly lower meaning higher load results in less COF and less wear rate.
Can it be that the contact area between the two materials increases for some reason? Plastic deformation or higher planarity for some reason?
Sometimes a lower wear under higher load can be explained because the particle debris are sintered back into one of the two bodies. This means that the detached wear debris literally reattach to the acting or counter-acting body due to the high load, basically what happens in the process of sintering powders to obtain solid objects. This happens easily with metals rather than ceramic but it my happen also with ceramics. a better description of your experiment and conditions would help in understanding if you are close to the plastic deformation loads.
@Elia: That could be due to the change of wear mechanism. What I have seen from SEM and AFM images, more grooves and ploughing are obvious in lower load.
@Enrico: Thank you. I have not seen any evidence of this behaviour so far. It might need further investigation.
@Reddy and Vikas: Thank you
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