HIGH TEMPERATURE OXIDATION BEHAVIOURS OF THREE ZIRCONIUM ALLOYS
QIU Jun, ZHAO Wenjin Thomas Guilbert Jean-Luc Bechade
1) Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041
2) French Atomic Energy and Alternative Energies Commission, Gif-sur-Yvette cedex 91191, France
Cite this article:
QIU Jun ZHAO Wenjin Thomas Guilbert Jean-Luc Bechade. HIGH TEMPERATURE OXIDATION BEHAVIOURS OF THREE ZIRCONIUM ALLOYS. Acta Metall Sin, 2011, 47(9): 1216-1220.
Abstract Isothermal oxidation behaviors of Zr-alloys Zr-A and Zr-B cladding tubes in flowing oxygen were measured and compared to Zr-4 cladding tube over a wide temperature range from 700 ℃ to 1200 ℃. The results show that the kinetics oxidation curves of all the alloys basically obey the parabolic rate law at the temperature range from 700 ℃ to 1200 ℃. In 700 ℃ oxidation of alloy Zr-B, a rate transition occurrs at about 1200 s. The rate transitions in 800 ℃ curves of alloys Zr-A and Zr-B occurr at about 600 s. The oxidation kinetics curves are changed for all the alloys at 1000 ℃, which is resulted from the crack in the oxide layer due to the ZrO2 phase transformation from a monoclinic structure to a tetragonal structure. At the temperature above 1100 ℃, the oxidation kinetics curves of all the alloys obey the parabolic rate law, and no kinetics changes were observed. The results also show that the alloy composition has a negligible effect on the oxidation resistance at the temperature above 1100 ℃. The parabolic rate constant Kp of the oxidation reaction was get through calculating weight gain due to oxidation.
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