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- W1997217312 abstract "Abstract CrN/AlN superlattices are favored as protective coatings for various production tools and automobile and aerospace components. Recently, we showed that for thicknesses below 3 nm, the AlN layers crystallize in their metastable cubic structure if the CrN layers are at least as thick as these AlN layers. By optimizing the CrN/AlN layer thickness ratios to 2/1, 3.5/2, and 3/3 nm highest as-deposited hardnesses of ~ 31 GPa can be obtained. Unfortunately, this is combined with a low thermal stability, whereas coatings with CrN/AlN layer thickness ratios below 1 (i.e., thinner CrN than AlN layers) are able to remain their as-deposited hardnesses of ~ 24 GPa even after annealing at 1100 °C. Complementary differential scanning calorimetry and structural investigations after various annealing steps by transmission electron microscopy and X-ray diffraction show, that for these coatings the properties are mainly determined by the higher overall content of AlN. Contrary, for CrN/AlN layer thickness ratios above 1, the thermal stability is mainly determined by the dissociation of the CrN layers to Cr and N 2 via the formation of Cr 2 N. Our results clearly show that especially for CrN/AlN superlattices higher as-deposited hardnesses are balanced with lower thermal stability." @default.
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- W1997217312 date "2014-02-01" @default.
- W1997217312 modified "2023-09-27" @default.
- W1997217312 title "Thermal stability of CrN/AlN superlattice coatings" @default.
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- W1997217312 doi "https://doi.org/10.1016/j.surfcoat.2013.12.035" @default.
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