Oxidation behavior and thermal stability of Cr2AlB2 powders

Oxidation behavior and thermal stability of Cr2AlB2 powders
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Cr2AlB2粉末的氧化行为和热稳定性

DOI:
10.1016/j.corsci.2020.108941
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发表时间:
2020-11
期刊:
影响因子:
8.3
通讯作者:
Zhou Yanchun
Zhou Yanchun
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang Haiming;Xiang Huimin;Dai Fu-Zhi;Zhang Zhili;Zhou Yanchun

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研究了Cr2 AlB 2粉末在600 - 1200 °C下的热稳定性和氧化行为。Cr2 AlB 2在氩气中在900 °C以下稳定,在950−1070 °C时部分分解为Cr 4AlB 4和Al,在1090−1200 °C时部分分解为CrB和Al。空气中的氧化在680 °C开始,直到1200 °C表现出初始的快速线性氧化,然后是缓慢的抛物线氧化行为。形成保护性的Cr2 O3(低于750 °C)或Al 2 O3(高于800 °C)氧化膜,使Cr2 AlB 2表现出良好的抗氧化性能。基于计算的自由能与氧化反应,一个很好的相关性与实验结果。
Thermal stability and oxidation behavior of Cr2AlB2powders were investigated at 600−1200 °C. Cr2AlB2is stable up to 900 °C in argon, partially decomposes into Cr4AlB4and Al at 950−1070 °C, and partially decomposes into CrB and Al at 1090−1200 °C. Oxidation in air initiates at 680 °C and up to 1200 °C exhibits an initial rapid linear oxidation followed by a slow parabolic oxidation behavior. A protective Cr2O3(below 750 °C) or Al2O3(above 800 °C) scale is formed, which makes Cr2AlB2exhibit good oxidation resistance. Based on the calculated free energies associated with the oxidation reactions, a good correlation with the experimental results was found.
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