The coating strength as well as the interface fracture toughness for the (Ti,Al N coatings on the hard metal substrate can be estimated from the damage map in a straightforward way, without the knowledge of creep parameters.
For determining coating strength properties, nanoindentations were carried out.
In order to take into account its influence, the internal stress was evaluated, and the COS and the coating strength obtained with this method were corrected.
The experimental results and numerical simulations suggest that coating damage is commonly caused by low coating strength, high contact pressure, and poor lubrication.
The average coating strength parallel to the substrate is approximately 1.5 times greater than the bond strength perpendicular to substrate.
Higher powder feed rates produced coatings with higher failure loads in three point bending, higher coating cohesion and lower coating strength anisotropy, presumably due to a peening effect.
HA coating should have pores of about 100 200 microns and an acceptable porosity index to promote osteoconductivity, although coating strength decreases with porosity [ 19].
Moreover, a functionally designed infrastructure material coated with a high strength layer, but with different coating strengths at the interface, is also investigated to find out the protective effect of material from spallation.
Coating adhesion strength and behavior of coating was evaluated using scratch test for constant load and varying load.
An increasing of the coating thickness deteriorates the coating mechanical strength, however it can lead to higher effective cutting edge radii, thus inducing lower stresses on the cutting edge, as the related FEM simulation results of the cutting edge region during the material removal show.
