Fracture Properties of α– and ĸ–Al2O3 Hard Coatings Deposited by Chemical Vapor Deposition

Although α– and κ–Al2O3 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:	Fabian Konstantiniuk, Michael Tkadletz, Christoph Czettl, Nina Schalk
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CVD α–Al<sub>2</sub>O<sub>3</sub> κ–Al<sub>2</sub>O<sub>3</sub> fracture stress fracture toughness Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/9a38ab3ba82e493695ce987e773e43ac
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spelling	oai:doaj.org-article:9a38ab3ba82e493695ce987e773e43ac2021-11-25T17:16:27ZFracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition10.3390/coatings111113592079-6412https://doaj.org/article/9a38ab3ba82e493695ce987e773e43ac2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1359https://doaj.org/toc/2079-6412Although 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 MPam<sup>1/2</sup> (compared to 3.2 ± 0.3 MPam<sup>1/2</sup> for alpha).Fabian KonstantiniukMichael TkadletzChristoph CzettlNina SchalkMDPI AGarticleCVDα–Al<sub>2</sub>O<sub>3</sub>κ–Al<sub>2</sub>O<sub>3</sub>fracture stressfracture toughnessEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1359, p 1359 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CVD α–Al<sub>2</sub>O<sub>3</sub> κ–Al<sub>2</sub>O<sub>3</sub> fracture stress fracture toughness Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	CVD α–Al<sub>2</sub>O<sub>3</sub> κ–Al<sub>2</sub>O<sub>3</sub> fracture stress fracture toughness Engineering (General). Civil engineering (General) TA1-2040 Fabian Konstantiniuk Michael Tkadletz Christoph Czettl Nina Schalk Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
description	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 MPam<sup>1/2</sup> (compared to 3.2 ± 0.3 MPam<sup>1/2</sup> for alpha).
format	article
author	Fabian Konstantiniuk Michael Tkadletz Christoph Czettl Nina Schalk
author_facet	Fabian Konstantiniuk Michael Tkadletz Christoph Czettl Nina Schalk
author_sort	Fabian Konstantiniuk
title	Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
title_short	Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
title_full	Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
title_fullStr	Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
title_full_unstemmed	Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition
title_sort	fracture properties of α– and ĸ–al<sub>2</sub>o<sub>3</sub> hard coatings deposited by chemical vapor deposition
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9a38ab3ba82e493695ce987e773e43ac
work_keys_str_mv	AT fabiankonstantiniuk fracturepropertiesofaandĸalsub2subosub3subhardcoatingsdepositedbychemicalvapordeposition AT michaeltkadletz fracturepropertiesofaandĸalsub2subosub3subhardcoatingsdepositedbychemicalvapordeposition AT christophczettl fracturepropertiesofaandĸalsub2subosub3subhardcoatingsdepositedbychemicalvapordeposition AT ninaschalk fracturepropertiesofaandĸalsub2subosub3subhardcoatingsdepositedbychemicalvapordeposition
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Fracture Properties of α– and ĸ–Al<sub>2</sub>O<sub>3</sub> Hard Coatings Deposited by Chemical Vapor Deposition

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