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.
QIU Jun
,
DIAO Wen-Jin
. HIGH TEMPERATURE OXIDATION BEHAVIOURS OF THREE ZIRCONIUM ALLOYS[J]. Acta Metall Sin, 2011
, 47(9)
: 1216
-1220
.
DOI: 10.3724/SP.J.1037.2011.00211
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