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Experimental and modelling techniques for assessing the adhesion of very thin coatings on glass

Jinju Chen1,3, Zheshuai Lin2,4, S J Bull1, C L Phillips2 and P D Bristowe2

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The adhesion of very thin (<100 nm) coatings on glass is not easy to assess. A particular issue at the present time is the assessment of the adhesion of thin metal coatings sandwiched between dielectric layers in a multilayer stack as is used in solar control coatings. A range of experimental techniques have been developed for thicker coatings but they do not always give consistent results, particularly as the coating thickness decreases. In all cases the operating failure mechanisms must be identified and the correct methods for analysing the data produced must be selected. In this paper, the experimental techniques, models and atomistic simulations which can determine the interfacial adhesion of thin ZnO/Ag ceramic/metal layers have been investigated. Overlayer techniques, scratch and nanoindentation techniques, and double cantilever beam methods can give reasonable and consistent results which agree very well with the intrinsic interface adhesion obtained from atomistic simulations.


PACS

68.35.Np Adhesion

68.35.Gy Mechanical properties; surface strains

68.35.Dv Composition, segregation; defects and impurities

62.20.M- Structural failure of materials

68.60.Bs Mechanical and acoustical properties

81.15.-z Methods of deposition of films and coatings; film growth and epitaxy

Subjects

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 21 (7 November 2009)

Received 23 February 2009, in final form 5 May 2009

Published 22 October 2009



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