Typical applications of adhesion measurements by wedge blade indenter
This report presents the use of a wedge blade indenter in adhesion characterization by scratch testing. Its sharp edge geometry enables controlled removal of coating layers, allowing clear identification of layer delamination across a wide range of applications.
Adhesion plays a fundamental role in the performance and long-term reliability of coated materials. From nanometerscale functional films used in microelectronics to
micrometer-thick decorative coatings, insufficient adhesion can lead to adhesion failure, optical degradation, or premature corrosion.
Adhesion is commonly evaluated using progressive load scratch testing. Conventional approach typically relies on spherical indenters, which are well suited for assessing scratch resistance and adhesion in hard coatings. However, when testing soft, thick or ductile layers, this geometry may induce plastic deformation or mearing rather than interfacial failure, making the critical load difficult to determine.
The wedge blade indenter overcomes these limitations through its sharp linear edge, which produces a knife-like cutting action. This promotes controlled layer separation, generates clearly visible delamination, and enables accurate determination of the critical load (Lc).
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