Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
Although α– and κ–Al<sub>2</sub>O<sub>3</sub> hard coatings deposited by chemical vapor deposition are well established in the metal-cutting industry for their ability to increase the performance and lifetime of cutting tools, the literature on their fracture properties is sc...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9a38ab3ba82e493695ce987e773e43ac |
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| Sumario: | Although α– and κ–Al<sub>2</sub>O<sub>3</sub> hard coatings deposited by chemical vapor deposition are well established in the metal-cutting industry for their ability to increase the performance and lifetime of cutting tools, the literature on their fracture properties is scarce. Thus, within this study, the microstructure and mechanical properties of α– and κ–Al<sub>2</sub>O<sub>3</sub> coatings were investigated and compared to each other. X-ray diffraction and scanning electron microscopy combined with electron backscatter diffraction showed that both coatings exhibited a fiber texture, where the α-Al<sub>2</sub>O<sub>3</sub> coating displayed a (0001) texture and the κ–Al<sub>2</sub>O<sub>3</sub> coating a (001) texture with a certain (013) contribution. Higher hardness and Young’s modulus values of 31.0 ± 0.9 GPa and 474.6 ± 12.5 GPa, respectively, were obtained for the α–Al<sub>2</sub>O<sub>3</sub> coating, compared to 24.2 ± 0.8 GPa and 356.8 ± 7.9 GPa for κ–Al<sub>2</sub>O<sub>3</sub>. While the α–Al<sub>2</sub>O<sub>3</sub> coating exhibited a higher fracture stress of 8.1 ± 0.3 GPa (compared to 6.4 ± 0.6 GPa for κ–Al<sub>2</sub>O<sub>3</sub>), the κ–Al<sub>2</sub>O<sub>3</sub> coating showed a higher fracture toughness of 4.4 ± 0.3 MPa*m<sup>1/2</sup> (compared to 3.2 ± 0.3 MPa*m<sup>1/2</sup> for alpha). |
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