Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C
Zircaloy-4 isothermal oxidation tests were conducted at 1000 °C under an oxygen atmosphere with flow rates varying from 20 to 200 mL/min. In this research, a breakaway time delay phenomenon was discovered. The temperature of the atmosphere near the cladding was measured in order to estimate the oxid...
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MDPI AG
2022-03-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/6/2871 |
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| author | Gippeum Kim Siwon Seo Jaeyoung Lee |
| author_facet | Gippeum Kim Siwon Seo Jaeyoung Lee |
| author_sort | Gippeum Kim |
| collection | DOAJ |
| description | Zircaloy-4 isothermal oxidation tests were conducted at 1000 °C under an oxygen atmosphere with flow rates varying from 20 to 200 mL/min. In this research, a breakaway time delay phenomenon was discovered. The temperature of the atmosphere near the cladding was measured in order to estimate the oxidation rate and identify the condition of the phenomenon. A sharp escalation in the cladding temperature was observed in the early stage of oxidation as the flow rate increased. In addition, macroscopic and microscopic observations were performed to identify the effects of initial temperature escalation. The results showed that the thickness of the dense columnar oxide increased in the oxide scale when the initial peak temperature exceeded 1050 °C. Based on these observations, it can be assumed that temperature escalation in the early stage can influence the thickness of dense oxides, and this in turn affects the oxidation behaviors, especially the breakaway time. |
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| id | doaj.art-ec3d101c93464645b7bc8addce2e8843 |
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| issn | 2076-3417 |
| language | English |
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| publishDate | 2022-03-01 |
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| spelling | doaj.art-ec3d101c93464645b7bc8addce2e88432023-11-24T00:20:32ZengMDPI AGApplied Sciences2076-34172022-03-01126287110.3390/app12062871Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °CGippeum Kim0Siwon Seo1Jaeyoung Lee2Department of Mechanical and Control Engineering, Handong Global University, 558 Handong-ro, Buk-gu, Pohang 37554, KoreaDepartment of Mechanical and Control Engineering, Handong Global University, 558 Handong-ro, Buk-gu, Pohang 37554, KoreaDepartment of Mechanical and Control Engineering, Handong Global University, 558 Handong-ro, Buk-gu, Pohang 37554, KoreaZircaloy-4 isothermal oxidation tests were conducted at 1000 °C under an oxygen atmosphere with flow rates varying from 20 to 200 mL/min. In this research, a breakaway time delay phenomenon was discovered. The temperature of the atmosphere near the cladding was measured in order to estimate the oxidation rate and identify the condition of the phenomenon. A sharp escalation in the cladding temperature was observed in the early stage of oxidation as the flow rate increased. In addition, macroscopic and microscopic observations were performed to identify the effects of initial temperature escalation. The results showed that the thickness of the dense columnar oxide increased in the oxide scale when the initial peak temperature exceeded 1050 °C. Based on these observations, it can be assumed that temperature escalation in the early stage can influence the thickness of dense oxides, and this in turn affects the oxidation behaviors, especially the breakaway time.https://www.mdpi.com/2076-3417/12/6/2871zirconium oxidationreaction heattemperature escalationflow rate effectoxidation kineticsbreakaway |
| spellingShingle | Gippeum Kim Siwon Seo Jaeyoung Lee Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C Applied Sciences zirconium oxidation reaction heat temperature escalation flow rate effect oxidation kinetics breakaway |
| title | Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C |
| title_full | Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C |
| title_fullStr | Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C |
| title_full_unstemmed | Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C |
| title_short | Investigation of Breakaway Time Delay Phenomenon in Isothermal Test with Zircaloy-4 under Oxygen Atmosphere at 1000 °C |
| title_sort | investigation of breakaway time delay phenomenon in isothermal test with zircaloy 4 under oxygen atmosphere at 1000 °c |
| topic | zirconium oxidation reaction heat temperature escalation flow rate effect oxidation kinetics breakaway |
| url | https://www.mdpi.com/2076-3417/12/6/2871 |
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