Kinetic Study of the Competitive Growth Between θ-Al2O3 and α-Al2O3 During the Early Stages of Oxidation of β-(Ni,Pt)Al Bond Coat Systems: Effects of Low Oxygen Partial Pressure and Temperature

Autor:	G. Trápaga-Martínez, J. Munoz-Saldana, R. Morales-Estrella, Brian Gleeson, Juan Manuel Alvarado-Orozco, M. S. Boldrick
Rok vydání:	2014
Předmět:	Thermal barrier coating Thermogravimetric analysis Materials science Mechanics of Materials Kinetics Metals and Alloys Nucleation Analytical chemistry Partial pressure Condensed Matter Physics Luminescence Spectroscopy Isothermal process
Zdroj:	Metallurgical and Materials Transactions A. 46:726-738
ISSN:	1543-1940 1073-5623
DOI:	10.1007/s11661-014-2669-3
Popis:	An oxidation study of β-(Ni,Pt)Al commercial bond coat systems was carried by means of TGA analysis during isothermal treatments at temperatures from 1273 K to 1423 K (1000 °C to 1150 °C). The effect of oxygen partial pressure on their oxidation kinetics was studied and complemented by photo-stimulated luminescence spectroscopy and SEM. Pre-oxidation treatments performed on as-aluminized samples at 10−5 atm O2 did not accelerate the θ-Al2O3 → α-Al2O3 transformation, even after 5 hours of oxidation relative to samples oxidized in 0.21 atm O2, with the exception of the sample treated at 1273 K (1000 °C), where apparently α-Al2O3 nucleation started earlier for the sample treated at a low pO2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c661b01264a09f235ffb611fa5696915 https://doi.org/10.1007/s11661-014-2669-3 Zobrazit plný text záznamu Full text from SpringerLink