Abstract
The TiN, TiAlN and TiAlSiN coatings were deposited on H13 hot-worked mold steel by cathodic arc ion plating (CAIP). The morphologies, phase compositions, and nanoindentation parameters, such as creep hardness, elastic modulus and plastic deformation energy of the coatings were analyzed with field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and nanoindentation testing, respectively, and the test results were compared with equation describing the indentation model. The results show that the TiN, TiAlN and TiAlSiN coating surfaces were dense and composed of TiN, TiN + TiAlN, TiN + Si3N4 + TiAlN phases, respectively. There was no spalling or cracking on the indentation surface. The creep hardness of the TiN, TiAlN and TiAlSiN coatings was 7.33, 13.5, and 15.2 GPa, respectively; the corresponding hardness measured by nanoindentation was 7.09, 15.6, and 21.7 GPa, respectively; and the corresponding elastic modulus was 201.93, 172.79, and 162.77 GPa, respectively. The contact depth and elastic modulus calculated by the indentation model were close to those of the test results, but the remaining indentation parameters showed discrepancies. The sequence of plastic deformation energy was TiN > TiAlN>TiAlSiN.
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