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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Combustion synthesis of Ni_3Al by SHS with boron additions
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Combustion synthesis of Ni_3Al by SHS with boron additions

机译：SHS与硼添加剂燃烧合成Ni_3Al

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摘要

The preparation of Ni3 Al Intel-metallic compound from elemental powder compacts with the addition of boron was conducted by self-propagating high-temperature synthesis (SHS) in this study. Effects of the boron content, preheating temperature, and particle size of the reactants on the combustion characteristics, as well as on the composition and morphology of final products were studied. Experimental observation indicates that the addition of boron results in a significant increase in the flame-front propagation velocity, leading to a two-stage combustion process preceded by the fast propagation of the flame front and consecutively followed by prolonged bulk combustion. However, the combustion temperature was slightly decreased by adding boron in the sample. The boron addition also contributed to a decrease in the activation energy associated with the combustion synthesis of Ni-,Al from 97.8 to 86.4kJ/mol. In contrast to the presence of an intermediate phase (NiAl) and the unreacted Ni in the final burned product of the boron-free samples, complete reaction yielding a single-phase product of Ni_3 Al was achieved for the boron-added samples. Moreover, the addition of boron also increased the density of the final products up to above 80 percent relative to the density of the Ni_3 Al compound.
机译：在本研究中，通过自蔓延高温合成（SHS）进行了从元素粉末压坯中添加硼制备Ni3 Al英特尔金属化合物。研究了硼含量，预热温度和反应物粒度对燃烧特性以及最终产物的组成和形态的影响。实验观察表明，硼的添加会导致火焰前沿传播速度显着提高，从而导致两阶段燃烧过程，火焰前沿快速传播，然后持续大量燃烧。但是，通过在样品中添加硼，燃烧温度略有降低。硼的添加也使与Ni-，Al燃烧合成相关的活化能从97.8降低到86.4kJ / mol。与无硼样品的最终燃烧产物中存在中间相（NiAl）和未反应的Ni相比，添加硼的样品可实现完全反应，生成Ni_3 Al单相产物。此外，硼的添加也使最终产物的密度相对于Ni_3 Al化合物的密度提高到80％以上。

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