Coating Characteristics - Thickness

This, apparently simple property has a criticality which many people have failed to recognize, especially in tri-biological applications. There is a complex interplay between effects such as the intrinsic stress within a coating, the hardness of the coating and the substrate and the adhesion to the substrate which must be optimized, essentially by the appropriate choice of thickness.

It can also be represented by concepts such as ‘mass thickness’, which seeks to recognize that films have varying densities and porosities. Thus simple step-height measurements of thickness could in many applications be meaningless without a quantification of density or porosity.

When dealing with surface treatments, such as nitriding or ion implantation, the definition of thickness or treatment depth is even less clear. Usually, in the former case the depth is taken to be that at which the layer hardness falls to a level one-third above the core hardness of the bulk material.

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