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This paper reports on the adhesion characterization of a PVD coating deposited onto mirror polished and laser frosted minting die surfaces. Experimental and numerical methods are both used to study the adhesion of the PVD coating. Stepped Rockwell-C indentation testing method is used to experimentally examine the coating adhesion. Finite element analyses of the stepped indentation adhesion tests are performed using critical loads determined from experimental testing. The analyses are performed to determine the stresses produced at the coating-substrate interface prior to coating adhesion failure and characterize the coating adhesion. The indentation simulations found that large compressive, shearing, and opening stresses were present at the coating-substrate interface in the regions where coating delamination was observed during experimental testing. The value of the compressive, opening, and shear critical stresses are found during finite element simulation of the indentation. These stress components provide good quantification of the coating adhesion strength.

Experimental and numerical investigation into the adhesion of PVD coatings on minting dies