Isothermal oxidation of bulk Zr_2Al_3C_4 at 500 to 1000 ℃ in air

L.F. He; Z.J. Lin; Y.W. Bao; M.S. Li; J.Y. Wang; Y.C. Zhou

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Isothermal oxidation of bulk Zr_2Al_3C_4 at 500 to 1000 ℃ in air

机译：空气中500至1000℃等温氧化Zr_2Al_3C_4体

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The isothermal oxidation behavior of Zr_2Al_3C_4 in the temperature range of 500 to 1000 ℃ for 20 h in air has been investigated. The oxidation kinetics follow a parabolic law at 600 to 800 ℃ and a linear law at higher temperatures. The activation energy is determined to be 167.4 and 201.2 kJ/mol at parabolic and linear stages, respectively. The oxide scales have a monolayer structure, which is a mixture of ZrO_2 and Al_2O_3. As indicated by x-ray diffraction and Raman spectra, the scales formed at 500 to 700 ℃ are amorphous, and at higher temperatures are α-Al_2O_3 and t-ZrO_2 nanocrystallites. The nonselective oxidation of Zr_2Al_3C_4 can be attributed to the strong coupling between Al_3C_2 units and ZrC blocks in its structure, and the close oxygen affinity of Zr and Al.

机译：研究了Zr_2Al_3C_4在500〜1000℃温度范围内在空气中20 h的等温氧化行为。在600到800℃时氧化动力学遵循抛物线律，在较高温度下遵循线性律。抛物线阶段和线性阶段的活化能分别确定为167.4和201.2 kJ / mol。氧化皮具有单层结构，其为ZrO_2和Al_2O_3的混合物。 X射线衍射和拉曼光谱表明，在500至700℃形成的氧化皮是无定形的，在较高温度下形成的是α-Al_2O_3和t-ZrO_2纳米晶体。 Zr_2Al_3C_4的非选择性氧化可归因于Al_3C_2单元与ZrC嵌段在其结构上的强耦合，以及Zr和Al的紧密氧亲合力。

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《Journal of Materials Research》 |2008年第2期|p.359-366|共8页
作者
L.F. He; Z.J. Lin; Y.W. Bao; M.S. Li; J.Y. Wang; Y.C. Zhou;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
中图分类工程材料学;
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Isothermal oxidation of bulk Zr_2Al_3C_4 at 500 to 1000 ℃ in air

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