Title: Analysis of crack resistance and quality of thin coatings by Acoustic Emission

Authors: Sergey A. Nikulin, Vladislav G. Khanzhin, Andrey B. Rozhnov, Alexander V. Babukin, Vladislav A. Belov

Addresses: Department of Metal Science and Physics of Strength, Moscow State Institute of Steel and Alloys, Russian Federation. ' Department of Metal Science and Physics of Strength, Moscow State Institute of Steel and Alloys, Russian Federation. ' Department of Metal Science and Physics of Strength, Moscow State Institute of Steel and Alloys, Russian Federation. ' Department of Metal Science and Physics of Strength, Moscow State Institute of Steel and Alloys, Russian Federation. ' Department of Metal Science and Physics of Strength, Moscow State Institute of Steel and Alloys, Russian Federation

Abstract: The Acoustic Emission (AE) method was employed to study the processes of surface crack initiation and evolution in surface protective coatings (Cr coatings on multifilamentary superconductoring wire, oxide layers on zirconium cladding tubes, thickness up to 8 µm). AE measurements allowed extracting the deformation of the beginning of active chrome destruction at tension. The AE method was applied to investigate the crack resistance of oxide layers on zirconium cladding tubes. The AE parameters were identified that characterise the oxide resistance to cracking which allows the forecast of the failure onset for an oxide film on items during tests and operation.

Keywords: acoustic emission; protective coatings; oxide layers; surface crack initiation; superconductors; zirconium cladding tubes; deformation; chrome destruction; crack resistance; nondestructive testing; NDT; microstructure; materials properties.

DOI: 10.1504/IJMMP.2006.011651

International Journal of Microstructure and Materials Properties, 2006 Vol.1 No.3/4, pp.364 - 373

Published online: 07 Dec 2006 *

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