Small diameter wires (150 to 250 x 10-6m) of the high-temperature alloys Haynes 188, Haynes 230, Haynes 214, Kanthai A1 and PM2000 were oxidized at 1204 deg C in dry oxygen or 50% H2O/50% O2 for 70 hours. The oxidation kinetics were monitored using a thermogravimetric technique. Oxide phase composition and morphology of the oxidized wires were determined by x-ray diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy. The alumina-forming alloys, Kanthal A1 and PM2000, out-performed the chromia-forming alloys under these test conditions. PM2000 was recommended as the most promising candidate for advanced hybrid seal applications for space reentry control surface seals or hypersonic propulsion system seals. This study also demonstrated that thermogravimetric analysis of small diameter wires is a powerful technique for the study of oxide volatility, oxide adherence, and breakaway oxidation.
Oxidation of high-temperature alloy wires in dry oxygen and water vapor
Meeting of the Electrochemical Society, 206, High Temperature Corrosion and Materials Chemistry, 5 ; 67-80
2004
14 Seiten, 9 Bilder, 2 Tabellen, 21 Quellen
Aufsatz (Konferenz)
Englisch
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