Characterization of Thin Oxide using FIB-SIMS and FIB-TEM Techniques

The use of SIMS for the characterization and study of biomaterial surfaces is fast gaining popularity in the development of bio-functional and bioactive tissue compatible interfaces. The presence of TiO 2 oxide in metallic Ti implants and its ability to promote bioactivity is still unclear. FIB-SIMS...

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Bibliographic Details
Main Authors: Ooi Thian Ngan, McPhail, D.S., Chater, R.J., Shollock, B.A.
Format: Conference Proceeding
Language:English
Subjects:
Alumina scales
Blades
Bonding
Coatings
Electron beams
Electron microscopy
FIB-SIMS
FIB-TEM
Implants
Isotopic tracer experiments
Mass spectroscopy
Oxidation
Transmission electron microscopy
Turbines
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Summary:The use of SIMS for the characterization and study of biomaterial surfaces is fast gaining popularity in the development of bio-functional and bioactive tissue compatible interfaces. The presence of TiO 2 oxide in metallic Ti implants and its ability to promote bioactivity is still unclear. FIB-SIMS (Focused Ion Beam-Secondary Ion Mass Spectrometry) and FIB-TEM (FIB-Transmission Electron Microscopy) techniques represent powerful tools for characterizing the oxide layer. This paper investigates the oxygen transport mechanism of thermal barrier coating systems applied on nickel-base superalloy turbine blades. In this study, a two-stage oxidation experiment is used. 18 O 2 is used as a tracer during the second stage oxidation on previously oxidized Ni-base superalloys with a layer of bond coat material. The aluminium oxide grown in 16 O 2 during the first stage oxidation serves as a background oxide. Mass spectra collected by FIB-SIMS reveal the counter mass transportation by inward diffusion of oxygen and outward diffusion of aluminium. New oxide formation during the second stage oxidation under an 18 O 2 enriched environment is observed at both the gas/oxide interface as well as oxide/superalloy interface. Transmission Electron Microscopy (TEM) can be used to identify the very fine phases developed in both the inter-diffusion zone as well as the thermally grown oxide layer. The use of Focused Ion Beam (FIB) technique allows for selective nano-machining of areas of interest for the production of TEM samples. FIB-SIMS and TEM are carried out to determine the specific phase transformations occurring in the TBC system.
ISSN:2159-3523
DOI:10.1109/NANOEL.2006.1609713