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- W2026900142 abstract "Mechanical or structural changes on surfaces and in near- surface layers become detectable by photothermal measurement techniques, when they correlate with alterations of thermal properties. We apply this approach on the detection of variations in ceramic surfaces (silicon nitride, WIDIANIT or alumina) wherein a mechanical impact load or a thermal surface treatment have been induced. Vickers indentations model the mechanical load during grinding and a thermal surface treatment was performed by pulsed laser illumination. Afterwards, the treated areas are either scanned stepwise resulting in a lateral resolution comparable to microscopic images (thermal microscopy) or examined at different modulation frequencies. The photothermal images show remarkable changes near the marked areas depending on the different loading strengths. Proceeding from the photothermal signals' amplitude and phase the depths and profiles of thermal conductivity variations can be reconstructed. Certainly, mechanical changes on surfaces and in near-surface layers, cracks and plastic deformations as well as alterations of the microcrystalline structures are responsible for these effects. Finally, we intend improving the surface finishing by the applied laser and thermal treatments." @default.
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- W2026900142 date "1996-09-18" @default.
- W2026900142 modified "2023-09-23" @default.
- W2026900142 title "<title>Photothermal inspection of material changes in ceramic surfaces induced by mechanical load or laser treatment</title>" @default.
- W2026900142 doi "https://doi.org/10.1117/12.250735" @default.
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