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

页码：138 / 144

页数：7

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