Failure mechanism and acoustic emission signal characteristics of coatings under the condition of impact indentation
Source abstract
Abstract
Abstract In this work, the substrate, NiCr coating, Al 2 O 3 coating with NiCr undercoating and Al 2 O 3 coating were tested by an impact indentation device equipped with an acoustic emission (AE) detection equipment. The surface morphology, dimension, cross-sectional image, 3D topography of indention and bonding strength of coatings were analyzed. The failure mechanism and AE signal characteristics of the coatings under impact were studied. The results demonstrate that the failure mode of NiCr coating was dominated by interface cracking, and that of Al 2 O 3 coating is fracture and accompanied by a small amount of interface cracking, while Al 2 O 3 coating with NiCr undercoating possesses common characteristics of the first two. The energy counting and wave voltage of AE signal were more sensitive to the bonding strength of coating in the impact process, which can be used to characterize the bonding strength of coating.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Corrosion Behavior and Inhibition · Erosion and Abrasive Machining
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Hebei University of Technology , Tian jin 300130, China
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering , Beijing 100072, China
References (20)
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