The current state-of-the-art in scratch testing of coated systems
| Autor: | Nicholas X. Randall |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Interface (computing) media_common.quotation_subject Mechanical engineering 02 engineering and technology engineering.material Field (computer science) Software 0203 mechanical engineering Coating Materials Chemistry Instrumentation (computer programming) Function (engineering) computer.programming_language media_common Profiling (computer programming) business.industry Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films 020303 mechanical engineering & transports Scratch engineering 0210 nano-technology business computer |
| Zdroj: | Surface and Coatings Technology. 380:125092 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2019.125092 |
| Popis: | Although the scratch test has now become commonplace both in the research field as a measurement tool and in industry as a Quality Control (QC) tool, the utility of this technique in gaining a truly quantitative measure of the adhesion of a coating has only been approached in the past few years, with the aid of recent advances in instrumentation, analysis protocols and advanced software. This paper provides a timely review of recent progress made in respect to extracting highly accurate, reproducible and quantitative data from the scratch test. Interpretation of datasets has been made easier through the advent of better tools, such as panoramic imaging, depth profiling and synchronized optical microscopic observation of the scratch track. Better ways of modelling the deformation of a coating, substrate and interface as a function of applied load has brought a better general understanding of the best test parameters for encouraging failure at the required depth (usually at the interface between coating and substrate). This has led to a wider range of indenter sizes gaining popularity now that the ideal contact conditions can be calculated pre-test. Major advances have also been made in the use of the scratch test for measuring additional mechanical properties of materials, e.g., fracture toughness, hardness, viscoelasticity, etc., making it an ever more powerful tool for the materials engineer. Similarly, the combined use of the scratch test with other techniques, e.g., acoustic microscopy, Raman spectroscopy, in-situ microscopy, etc., has revealed additional information on sub-surface events (such as cracking, fatigue, rupture, etc.) which were not previously accessible. These and other recent successful applications of the scratch test are expected to provide the critically needed information for developing multiscale models for the mechanical behavior of materials. This paper reviews these developments and looks ahead at future challenges, with the objective of helping engineers to use the scratch test method in the most appropriate way. |
| Databáze: | OpenAIRE |
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