Thermal stability of macroparticles in Ti0.27Al0.21N0.52 coatings

Holzapfel, Damian M. and Czigány, Zsolt and Eriksson, Anders O. and Arndt, Mirjam and Schneider, Jochen M. (2021) Thermal stability of macroparticles in Ti0.27Al0.21N0.52 coatings. APPLIED SURFACE SCIENCE, 553. ISSN 0169-4332

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Abstract

The presence of macroparticles in cathodic arc evaporated coatings is considered to be one major drawback of this synthesis method. We demonstrate with transmission electron microscopy (TEM) and atom probe tomography (APT) that the thermal stability of a macroparticle in the industrial benchmark coating (Ti,Al)N does not limit the overall coating thermal stability up to 1000 °C because metal-rich macroparticles exhibit a higher thermal stability than the c-(Ti,Al)N matrix. It is shown that the superior stability of the macroparticle is enabled by the self-organized formation of a c-TiN based diffusion barrier shell around the macroparticle.

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