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Title: Amorphous alumina thin films deposited on titanium: Interfacial chemistry and thermal oxidation barrier properties

Abstract

Ti/Al 2 O 3 bilayer stacks are used as model systems to investigate the role of atomic layer deposition (ALD) and chemical vapor deposition (CVD) to prepare 30–180 nm thick amorphous alumina films as protective barriers for the medium temperature oxidation (500–600 °C) of titanium, which is employed in aeronautic applications. X‐ray diffraction (XRD), transmission electron microscopy (TEM) with selected area electron diffraction (SAED), and X‐ray photoelectron spectroscopy (XPS) results show that the films produced from the direct liquid injection (DLI) CVD of aluminum tri‐isopropoxide (ATI) are poor oxygen barriers. The films processed using the ALD of trimethylaluminum (TMA) show good barrier properties but an extensive intermixing with Ti which subsequently oxidizes. In contrast, the films prepared from dimethyl aluminum isopropoxide (DMAI) by CVD are excellent oxygen barriers and show little intermixing with Ti. Overall, these measurements correlate the effect of the alumina coating thickness, morphology, and stoichiometry resulting from the preparation method to the oxidation barrier properties, and show that compact and stoichiometric amorphous alumina films offer superior barrier properties.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Centre Inter-universitaire de Recherche et d'Ingenierie des Materiaux (CIRIMAT) (France)
  2. Laboratoire d'Analyse et d'Architecture des Systemes LAAS-CNRS, Toulouse (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1271874
Alternate Identifier(s):
OSTI ID: 1400943
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physica Status Solidi. A, Applications and Materials Science
Additional Journal Information:
Journal Volume: 213; Journal Issue: 2; Journal ID: ISSN 1862-6300
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Baggetto, Loic, Charvillat, Cedric, Thebault, Yannick, Esvan, Jerome, Lafont, Marie-Christine, Scheid, Emmanuel, Veith, Gabriel M., and Vahlas, Constantin. Amorphous alumina thin films deposited on titanium: Interfacial chemistry and thermal oxidation barrier properties. United States: N. p., 2015. Web. doi:10.1002/pssa.201532838.
Baggetto, Loic, Charvillat, Cedric, Thebault, Yannick, Esvan, Jerome, Lafont, Marie-Christine, Scheid, Emmanuel, Veith, Gabriel M., & Vahlas, Constantin. Amorphous alumina thin films deposited on titanium: Interfacial chemistry and thermal oxidation barrier properties. United States. https://doi.org/10.1002/pssa.201532838
Baggetto, Loic, Charvillat, Cedric, Thebault, Yannick, Esvan, Jerome, Lafont, Marie-Christine, Scheid, Emmanuel, Veith, Gabriel M., and Vahlas, Constantin. Wed . "Amorphous alumina thin films deposited on titanium: Interfacial chemistry and thermal oxidation barrier properties". United States. https://doi.org/10.1002/pssa.201532838. https://www.osti.gov/servlets/purl/1271874.
@article{osti_1271874,
title = {Amorphous alumina thin films deposited on titanium: Interfacial chemistry and thermal oxidation barrier properties},
author = {Baggetto, Loic and Charvillat, Cedric and Thebault, Yannick and Esvan, Jerome and Lafont, Marie-Christine and Scheid, Emmanuel and Veith, Gabriel M. and Vahlas, Constantin},
abstractNote = {Ti/Al 2 O 3 bilayer stacks are used as model systems to investigate the role of atomic layer deposition (ALD) and chemical vapor deposition (CVD) to prepare 30–180 nm thick amorphous alumina films as protective barriers for the medium temperature oxidation (500–600 °C) of titanium, which is employed in aeronautic applications. X‐ray diffraction (XRD), transmission electron microscopy (TEM) with selected area electron diffraction (SAED), and X‐ray photoelectron spectroscopy (XPS) results show that the films produced from the direct liquid injection (DLI) CVD of aluminum tri‐isopropoxide (ATI) are poor oxygen barriers. The films processed using the ALD of trimethylaluminum (TMA) show good barrier properties but an extensive intermixing with Ti which subsequently oxidizes. In contrast, the films prepared from dimethyl aluminum isopropoxide (DMAI) by CVD are excellent oxygen barriers and show little intermixing with Ti. Overall, these measurements correlate the effect of the alumina coating thickness, morphology, and stoichiometry resulting from the preparation method to the oxidation barrier properties, and show that compact and stoichiometric amorphous alumina films offer superior barrier properties.},
doi = {10.1002/pssa.201532838},
journal = {Physica Status Solidi. A, Applications and Materials Science},
number = 2,
volume = 213,
place = {United States},
year = {Wed Dec 02 00:00:00 EST 2015},
month = {Wed Dec 02 00:00:00 EST 2015}
}

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Works referencing / citing this record:

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Amorphous Alumina Films Efficiently Protect Ti6242S against Oxidation and Allow Operation above 600 °C
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