Corrosion and oxidation resistance are of great importance for hard tribological coatings when it concerns thermal stability under severe cutting conditions. A comparative investigation of Cr-doped Ti-B-N coatings deposited by DC magnetron sputtering of TiCrB targets with 20, 30 and 40 wt. % of chro
Thermal evolution and mechanical properties of hard Ti–Cr–B–N and Ti–Al–Si–B–N coatings
✍ Scribed by Carlo Paternoster; Alberto Fabrizi; Raimondo Cecchini; S. Spigarelli; Ph.V. Kiryukhantsev-Korneev; A. Sheveyko
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 840 KB
- Volume
- 203
- Category
- Article
- ISSN
- 0257-8972
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✦ Synopsis
Surface properties modification is an effective way to improve the performances of materials subjected to thermo-mechanical stress. Nanocomposite Ti-B-N based coatings have high hardness, while their behavior at elevated temperatures can be enhanced through the addition of other elements. Mechanical properties and oxidation behavior of Ti-Cr-B-N and Ti-Al-Si-B-N coatings, deposited through ion implantation assisted magnetron sputtering on Si are presented. Microstructure investigation by XRD and TEM, hardness and Young's modulus by in plane and cross sectional nanoindentation, were performed on as-deposited coatings and after annealing in air at 900 °C. Evolution of morphology and microstructure and its relationship with coatings hardness is described.
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Silicon alloying of TiN has been performed by CVD from TiCl 4 -SiH 2 Cl 2 -NH 3 or N 2 -H 2 at temperatures between 850 °C and 1100 °C. With ammonia, only triphased coatings have been deposited, corresponding to TiSi 2 -Ti 5 Si 3 (N)-TiN and TiSi 2 -a Si 3 N 4 -TiN mixtures. With nitrogen, the incor