A novel criterion to identify coatings’ adhesion

ABSTRACT

A novel criterion, plastic/elastic deformation work (W_p/W_e), was introduced to identify the co-deformation capacity of chromium–nitrogen (Cr–N) coating and titanium alloy system, which can be related to the coating/substrate adhesion. By changing the N₂ flow (f_N2), the Cr–N coatings were deposited on Ti6Al4V (TC4) alloy substrate to obtain Cr(N), Cr₂N and/or CrN coatings, which could be related to the various deformation capacities. It indicated that the high W_p/W_e ratios of the metallic Cr(N)/TC4 systems deformed coordinately and attached well. Among the ceramic CrN_x/TC4 systems, the single-phase CrN/TC4 exhibited higher W_p/W_e ratio of 1.71 than 1.52 and 1.61 of the Cr₂N or Cr₂N@CrN/TC4 and better adhesion. As a novel criterion, W_p/W_e ratio indicates the co-deformation capacity of a coating/alloy system, related to the failure mechanism and the adhesion of a coating to the substrate.

KEYWORDS:

• Criterion
• W_p/W_e
• indentation
• co-deformation
• adhesion

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 51972155]; Natural Science Foundation of Liaoning Province [grant number LJKZ0278 and LJKZ0306].