Reaction rate of combustion synthesis of an intermetallic compound
Reaction rate of combustion synthesis of an intermetallic compound
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DOI：
10.1016/s0032-5910(97)03345-7
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发表时间：
1998-02
影响因子：
5.2
通讯作者：
T. Akiyama;Hiromichi Isogai;J. Yagi
中科院分区：
文献类型：
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作者：
T. Akiyama;Hiromichi Isogai;J. Yagi
研究了由镁和镍的混合粉末燃烧合成Mg 2Ni的反应动力学。通过扫描电子显微镜（SEM）、电子探针X射线微区分析（EPMA）、X射线衍射（XRD）和差示扫描量热仪（DSC）研究了燃烧合成过程中样品的物理和化学变化，并推导出合适的速率方程。观察结果表明，Mg 2Ni的合成进展均匀，而不是局部化学，而不是通过一个中间相，与加速液体生成的共析相。结果表明，最合理的表达式是二阶不可逆方程k（1−f）2，活化能为165 kJ/mol。
The reaction kinetics of the combustion synthesis of Mg2Ni from a powder mixture of magnesium and nickel has been investigated. The physical and chemical changes of the samples during the combustion synthesis were followed by scanning electron microscopy (SEM), electron probe X-ray microanalysis (EPMA), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) to derive a suitable rate equation. The observations revealed that the synthesis of Mg2Ni progresses homogeneously rather than topochemically, and not through an intermediate phase, with acceleration by liquid generation of the eutectoid phase. The result was that the most reasonable expression is a second-order irreversible equation, k(1−f)2, with an activation energy of 165 kJ/mol.