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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.
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.
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.
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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.
This behavior is analyzed using an analytical rumpling model to explain that the improved bond coat strength is the major contributing factor to rumpling inhibition.
The addition of GO into HA coatings could reduce the surface cracks and increase the coating adhesion strength from 1.55 ± 0.39 MPa (pure HA) to 2.75 ± 0.38 MPa (2 wt.% GO/HA) and 3.3 ± 0.25 MPa (5 wt.% GO/HA), respectively.
From this analysis it has been concluded that the coating yield strength is of utmost importance in conferring the a-C H coa-C Hsystem the required stability in a coatedive systemon.
Furthermore, the coating fatigue strength was depicted through impact test experiments.
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