Co–Al porous intermetallics were fabricated by an efficient and energy-saving method of thermal explosion (TE) reactions. The effects of Co/Al molar ratios on the temperature profiles, phase compositions, expansion behaviors, density, pore characteristics, and oxidation resistance were investigated. When the target furnace temperature was set at 700°C, there was an obvious exothermic peak in the temperature profiles. The ignition temperatures were in the range of 600–645°C, and the combustion temperatures were in the range of 984–1,421°C. Co–Al porous intermetallics had the open porosity of 27–43%, and the pores were from nonfully dense green compacts and explosion behaviors of TE. The specimen with Co:Al = 2:9 possessed a higher open porosity of 42.8%, the lowest density of 1.86 g cm −3 , and the largest volume expansion of 76.7%. The porous specimens with Co:Al = 1:1 possessed the highest open porosity of 43.2%, the lowest volume expansion of 12.3%, and the highest density of 3.42 g cm −3 . All Co–Al porous intermetallics showed excellent oxidation resistance at 650°C in air, especially the specimen with Co:Al = 1:1 had the highest oxidation resistance.

中文翻译：

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热爆炸反应制备Co-Al多孔金属互化物的微观结构和性能

钴铝多孔金属间化合物是通过高效且节能的热爆炸（TE）反应方法制备的。研究了Co / Al摩尔比对温度分布，相组成，膨胀行为，密度，孔特征和抗氧化性的影响。当目标炉温设定为700°C时，温度曲线会出现明显的放热峰。着火温度为600–645°C，燃烧温度为984–1,421°C。Co-Al多孔金属间化合物的开孔率为27-43％，孔来自不完全致密的生坯和TE的爆炸行为。Co∶Al ＝ 2∶9的样品具有较高的开孔孔隙率42.8％，最低密度1.86g cm -3，最大体积膨胀率76.7％。Co：Al ＝ 1：1的多孔试样的最大空孔率为43.2％，最小体积膨胀率为12.3％，最大密度为3.42g·cm -3。所有的Co-Al多孔金属间化合物在650°C的空气中均表现出优异的抗氧化性，尤其是Co：Al = 1：1的样品具有最高的抗氧化性。