Influence of Heating Modes on Heat-Resistance of Zr and Zr-1% Nb Alloy

被引：0
|
作者：
Trush, V. S. [1 ]
Pohrelyuk, I. M. [1 ]
Luk'yanenko, O. G. [1 ]
Kravchyshyn, T. M. [1 ]
Fedirko, V. M. [1 ]
机构：
[1] Natl Acad Sci Ukraine, Karpenko Physicomech Inst, Lvov, Ukraine
来源：
MATERIALS SCIENCE | 2023年 / 59卷 / 02期
关键词：
zirconium; heat-resistance; oxidation resistance; activation energy; hardness;
D O I：
10.1007/s11003-024-00754-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Differences in the oxidation kinetics of zirconium and Zr-1% Nb alloy during heating in air depending on the heating rate, temperature and exposure time are revealed. The increase in the heating rate from 2.5 to 6 and 7.5 degrees C/min reduces the activation energy of the Zr oxidation process in the temperature range of 20-1000 degrees C from 70.2 to 67 and 52.7 kJ/mol, respectively. For the Zr-1% Nb zirconium alloy, increase in the heating rate from 5 to 10 and 20 degrees C/min causes an increase in the activation energy of the oxidation process from 65 to 70.1 and 78.5 kJ/mol, respectively. Such an increase in the heating rate (of zirconium from 2.5 to 7.5 degrees C/min, and of the Zr-1% Nb alloy from 5 to 20 degrees C/min) causes a decrease in the thickness of the ZrO2 oxide film. During isothermal exposure for 5 h at 750 degrees C, Zr-1% Nb alloy and Zr at a temperature of 800 degrees C are oxidized according to the parabolic law. At 800 degrees C Zr-1% Nb alloy oxidizes according to the combined law: first, parabolic, and then quasi-linear.
引用
收藏
页码：138 / 144
页数：7
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