Mechanical properties of single and polycrystalline α-Al2O3 coatings grown by chemical vapor deposition

Fabian Konstantiniuk, Michael Tkadletz, Christina Kainz, Christoph Czettl, Nina Schalk

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

5 Zitate (Scopus)

Abstract

Due to the highly anisotropic mechanical properties of corundum, the lifetime of α-Al 2O 3 coated cutting tools is strongly influenced by its texture. However, limited literature is available on orientation dependent mechanical properties of α-Al 2O 3 coatings. Thus, in the present study, (0001), (11-20), (1-102) oriented single crystalline α-Al 2O 3 coatings and a state of the art (0001) textured polycrystalline α-Al 2O 3 coating were synthesized using chemical vapor deposition (CVD) on sapphire and cemented carbide substrates and the mechanical properties were investigated. The morphology of the coatings was studied by scanning electron microscopy and the respective orientation verified by electron backscatter diffraction. The (0001) oriented α-Al 2O 3 single crystalline coating yielded a slightly higher hardness of 34.4 ± 2.0 GPa compared to the other oriented coatings. Also, the maximum Young's modulus was observed for the (0001) oriented α-Al 2O 3 single crystalline coating, with a value of 451 ± 25 GPa. Furthermore, micromechanical tests were carried out to determine the fracture stress and fracture toughness, where the (11-20) oriented single crystalline coating exhibited the highest values of 11.2 ± 0.4 GPa and 4.1 ± 0.2 MPa m 1/2, respectively. Compared to the (0001) oriented single crystalline coating, the state of the art (0001) textured polycrystalline coating exhibits lower hardness, Young's modulus, fracture stress and fracture toughness values.

OriginalspracheEnglisch
Aufsatznummer126959
Seiten (von - bis)1-7
Seitenumfang7
FachzeitschriftSurface & coatings technology
Jahrgang410.2021
Ausgabenummer25 March
DOIs
PublikationsstatusVeröffentlicht - 11 Feb. 2021

Bibliographische Notiz

Funding Information:
The financial support by the Austrian Federal Ministry for Digital and Economic Affairs and the National Foundation for Research, Technology and Development is gratefully acknowledged. The authors gratefully acknowledge the financial support under the scope of the COMET program within the K2 Center “Integrated Computational Material, Process and Product Engineering (IC-MPPE)” (Project No 859480). This program is supported by the Austrian Federal Ministries for Transport, Innovation and Technology (BMVIT) and for Digital and Economic Affairs (BMDW), represented by the Austrian research funding association (FFG), and the federal states of Styria, Upper Austria and Tyrol.

Funding Information:
The financial support by the Austrian Federal Ministry for Digital and Economic Affairs and the National Foundation for Research, Technology and Development is gratefully acknowledged. The authors gratefully acknowledge the financial support under the scope of the COMET program within the K2 Center ?Integrated Computational Material, Process and Product Engineering (IC-MPPE)? (Project No 859480). This program is supported by the Austrian Federal Ministries for Transport, Innovation and Technology (BMVIT) and for Digital and Economic Affairs (BMDW), represented by the Austrian research funding association (FFG), and the federal states of Styria, Upper Austria and Tyrol.

Publisher Copyright:
© 2021 The Author(s)

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