Abstract We have developed a process to fabricate porous NiAl intermetallic compounds with a bi-modal porous structure by combining the combustion synthesis reaction and the space holder method. The fabricated porous NiAl showed large pores of the order of several tens of micrometers derived from the NaCl space holder and small pores of the order of several micrometers derived from the combustion synthesis reaction. The NaCl space holder acted as a heat absorber and contributed to the formation of small pores by preventing the melting of NiAl. Although the reaction was difficult to complete for large volume fractions of NaCl, it was possible to obtain single-phase NiAl by controlling the sintering conditions. We could finally obtain highly porous (porosity: >80%) single-phase NiAl with a hierarchical open-cell structure.

中文翻译：

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燃烧合成反应和空间保持器法制备具有分级开孔结构的多孔镍铝金属间化合物

摘要 我们开发了一种结合燃烧合成反应和空间支架法制备具有双峰多孔结构的多孔NiAl金属间化合物的工艺。制备的多孔 NiAl 显示出来自 NaCl 空间保持器的数十微米量级的大孔和来自燃烧合成反应的数微米量级的小孔。NaCl 空间支架起到吸热器的作用，通过阻止 NiAl 的熔化促进小孔的形成。尽管对于大体积分数的 NaCl，反应难以完成，但可以通过控制烧结条件获得单相 NiAl。我们最终可以获得具有分层开孔结构的高度多孔（孔隙率：> 80%）单相 NiAl。