Oxidation kinetics of Zircaloy-4 alloy at 673 K determined by GDOES technique

• Autorzy: Trybuś Bartłomiej , Olive Jean-Marc , Zieliński Andrzej

Identyfikatory

DOI

10.15199/28.2019.2.1

Warianty tytułu

PL

Kinetyka utleniania stopu Zircaloy-4 w 673 K określona metodą GDOES

• Języki publikacji: EN

Abstrakty

EN

Oxidation of zirconium alloys is a process that takes place during the operation of nuclear reactors and is essential for assessing the durability of fuel claddings. The present study was aimed to determine the oxidation kinetics of the Zircaloy-4 alloy using GDOES (glow discharge optical emission spectroscopy) at temperature 673 K corresponding to the conditions of use of fuel pellets. The tests were performed on non-oxidized samples as well as after their oxidation for 0.5, 2, 15 and 48 h. Oxygen layer growth was also investigated by thermogravimetric analysis after oxidation for 0.5 h. The naturally generated oxide at room temperature, designated as non-oxidized, had a thickness of 23±2 nm. After 2 h oxidation, an oxide possessing a thickness of 42±4 nm with about 155 nm of oxygen traces was observed. Oxidation for 15 h resulted in formation of an oxide with a thickness of 130±10 nm with a transition distance to the pure alloy of 240 nm. Finally, a layer with a thickness of 235±10 nm appeared after oxidation for 48 h, while the distance after which the measurement included only a pure alloy without the oxygen traces, was about 310 nm. The results show that oxidation can be described by the exponential kinetic equation, that has the parabolic form after 15 or 48 h of oxidation, which well fits the previous results. However, at shorter oxidation times the kinetic equation has the quasi-parabolic form (n < 2). The reason for changing the form of the equation can be attributed to the effect of defective crystalline structure on oxygen diffusion in the oxide layer as the porosity, crevices and cracks.

PL

W wielu pracach opisano masę tlenku cyrkonu powstającego podczas utleniania równaniem parabolicznym, ale według części autorów zależność ta lepiej daje się opisać równaniem kubicznym. Kinetyka opisana przez tę ostatnią zależność dowodzi, że proces dyfuzji atomów tlenu, który determinuje szybkość tworzenia się tlenku, nie jest procesem homogenicznym zachodzącym w idealnym ciele stałym, ale przebiega głównie na granicy ziaren. Celem pracy było określenie zależności ilościowych między czasem utleniania a grubością warstw tlenków w stosunkowo niskiej temperaturze 673 K, odpowiadającej normalnym warunkom pracy reaktorów jądrowych, za pomocą metody GDOES (optyczna spektrometria emisyjna z wyładowaniem jarzeniowym) rzadko stosowanej do badań takich procesów.

Słowa kluczowe

EN

diffusion; nuclear industry; zirconium oxide; zirconium oxidation kinetics; zirconium alloys; GDOES method

PL

dyfuzja; przemysł nuklearny; tlenek cyrkonu; kinetyka utleniania cyrkonu; stopy cyrkonu; optyczna spektroskopia emisyjna GDOES

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2019
• Tom: Vol. 40, nr 2
• Strony: 34--38
• Opis fizyczny: Bibliogr. 18 poz., fig., tab.

Twórcy

autor

Trybuś Bartłomiej

• Rokfin Ltd., Malkowo, Poland

autor

Olive Jean-Marc

• Universite Bordeaux, Institut de Mecanique et des Materiaux, Bordeaux, France

autor

Zieliński Andrzej

• Gdansk University of Technology, Department of Materials Engineering and Bonding, Gdansk

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).