Measurement of adhesion of thin polymer coatings by indentation

Ritter, J. E.; Lardner, T. J.; Rosenfeld, L.; Lin, Meng

doi:10.1063/1.344071

Cited by 70 publications

(17 citation statements)

References 12 publications

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“…For a soft coating on a rigid substrate, approaches based on contact radius at the initiation of delamination under the indenter have been proposed [64]. The following expression linking interfacial shear strength to coating hardness was given by [64],…”

Section: Models Based On Normal Indentation Techniquesmentioning

confidence: 99%

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Chen¹,

Bull²

2010

J. Phys. D: Appl. Phys.

124

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The fundamental property which often dictates the performance of a coating is its adhesion to the substrate and thus there are many techniques to measure adhesion. The choice of methods is dependent on many factors such as the mechanical properties of the coating and substrate, the interface properties, the microstructure of the coating/substrate system, residual stress, coating thickness and the intended application. Most tests aim to introduce a stable interfacial crack and make it propagate under controlled conditions and model this process to determine adhesion. The corresponding models are either stress analysis-based or energy-based. With the advent of miniature systems and very thin functional coatings, there is a need for characterization of adhesion at small length scales and some specific tests have been developed which are not appropriate for thicker coatings. Among these, indentation and scratch methods have the widest range of applicability but it is necessary to analyse the failure mechanisms before choosing an appropriate model to extract adhesion parameters. This paper reviews the main quantitative adhesion tests for coatings and highlights the tests which can be used to assess submicrometre coatings and thin films. The paper also highlights the modelling and analysis methods necessary to extract reliable adhesion properties illustrating this with examples for submicrometre coatings on silicon and architectural glass.

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Section: Models Based On Normal Indentation Techniquesmentioning

confidence: 99%

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Chen¹,

Bull²

2010

J. Phys. D: Appl. Phys.

124

View full text Add to dashboard Cite

show abstract

“…Only radial and circumferential stresses are used in obtaining fracture energy. (Thouless, 1988;Ritter et al, 1989;Rosenfeld et al, 1990) Figure II Figure III.1. X-ray diffraction data obtained for a bulk PE sample taken with a standard diffractometer at SNL .…”

Section: List Of Figuresmentioning

confidence: 99%

“…The parameters of the crack analysis are shown in Figure II.7. Integrating the normal stress and strains over the delaminated film volume gives the following strain energy release rate for fracture, (Thouless, 1988;Ritter et al, 1989;Rosenfeld et al, 1990)…”

Section: Ii142 Thick Film Indentation Delaminationmentioning

confidence: 99%

“…Only radial and circumferential stresses are used in obtaining fracture energy. (Thouless, 1988;Ritter et al, 1989;Rosenfeld et al, 1990) the film thickness, s o is set equal to (H-s ys ). With E set to 4.35 GPa, n equal to 0.38, and a uniform radial stress equal to 141 MPa, equation (3) shows that the fracture energy for 11.8 mm thick Epon 828/T403 film on aluminum averaged 3.6J/m 2 .…”

Section: Ii142 Thick Film Indentation Delaminationmentioning

confidence: 99%

“…Fracture energies were estimated (Strojny et al, 2000) following the analyses of Thouless, (1988), Ritter et al (1989), and Rosenfeld et al (1990) for films where in-plane indentation stresses drive interfacial fracture. In this analyses, delamination is assumed to initiate from an internal discontinuity of radius a, the contact radius.…”

Section: Ii142 Thick Film Indentation Delaminationmentioning

confidence: 99%

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Physical Basis for Interfacial Traction-Separation Models

Moody¹

2002

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Many weapon components contain interfaces between dissimilar materials where cracks can initiate and cause failure. In recent years many researchers in the fracture community have adopted a cohesive zone model for simulating crack propagation (based upon traction-separation relations) Sandia is implementing this model in its ASCI codes. There is, however, one important obstacle to using a cohesive zone modeling approach. At the present time traction-separation relations are chosen in an ad hoc manner. The goal of the present work is to determine a physical basis for Traction-Separation (T-U)relations. This report presents results of a program aimed at determining the dependence of such relations on adhesive and bulk properties. The work focused on epoxy/solid interfaces, although the approach is applicable to a broad range of materials. Asymmetric double cantilevered beam and free surface film nanoindentation fracture toughness tests were used to generate a unique set of data spanning length scales, applied mode mixities, and yield (plastic) zone constraint. The crucial roles of crack tip plastic zone size and interfacial adhesion were defined by varying epoxy layer thickness and using coupling agents or special self-assembled monolayers in preparing the samples. The nature of the yield zone was probed in collaborative experiments run at the Advanced Photon Source. This work provides an understanding of the major phenomena governing polymer/solid interfacial fracture and identifies the essential features that must be incorporated in a T-U based cohesive zone failure model. We believe that models using physically based T-U relations provide a more accurate and widely applicable description of interface cracking than models using ad hoc relations. Furthermore, these T-U relations provide an essential tool for using models to tailor interface properties to meet design needs.

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Adhesion Measurement of Thin Films and Coatings: Relevance to Microelectronics.

Lei

Kumar

2014

Adhesion in Microelectronics

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Measurement of adhesion of thin polymer coatings by indentation

Cited by 70 publications

References 12 publications

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Physical Basis for Interfacial Traction-Separation Models

Adhesion Measurement of Thin Films and Coatings: Relevance to Microelectronics.

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