Abstract Porous TiAl3 intermetallics were synthesized from Ti-75 at.% Al elemental powder mixtures using an energy-saving and rapid reactive method of thermal explosion (TE). The results demonstrated that the actual temperature of the compact climbed rapidly from 673 °C to 1036 °C within 24 s, indicating that an obvious TE reaction occurred during sintering process. The video graphs suggested that the TE in Ti–Al system behaved instant occurrence and overall heating whether from axial or radial direction. The silver wires and NaCl particles that pressed on the surface of the sample disappeared due to the heavy heat released during TE reaction. Only pure TiAl3 phases were synthesized in TE products and the open porosity of 55.4% was easy to obtain. After high-temperature treatment at 1000 °C, large amounts of sintering-neck formed and then improved the compressive strength of porous TiAl3 materials. Moreover, the mass gain curve of porous TiAl3 intermetallics oxidized at 650 °C for 120 h exhibited the parabolic oxidation rate law. XPS analysis confirmed that the strong O 1s peak was 531.4 eV which was the typical binding energy of Al2O3. Therefore, the excellent oxidation resistance of porous TiAl3 foams would be considered as good candidate materials for prolonging the service life at high temperatures.

中文翻译：

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热爆炸快速反应合成 TiAl3 金属间化合物及其高温抗氧化性

摘要 采用节能且快速反应的热爆炸 (TE) 方法，以 Ti-75 at.% Al 元素粉末混合物为原料合成多孔 TiAl3 金属间化合物。结果表明，压块的实际温度在 24 s 内从 673 °C 迅速攀升至 1036 °C，表明在烧结过程中发生了明显的 TE 反应。视频图表明，Ti-Al 系统中的 TE 表现出即时发生和整体加热，无论是从轴向还是径向。由于TE反应释放的大量热量，压在样品表面的银丝和NaCl颗粒消失了。TE 产品中仅合成了纯 TiAl3 相，并且很容易获得 55.4% 的开孔率。经过1000℃高温处理后，形成大量的烧结颈，提高了多孔 TiAl3 材料的抗压强度。此外，多孔 TiAl3 金属间化合物在 650℃下氧化 120 小时的质量增益曲线表现出抛物线氧化速率规律。XPS 分析证实，强 O 1s 峰为 531.4 eV，这是 Al2O3 的典型结合能。因此，多孔 TiAl3 泡沫优异的抗氧化性将被认为是延长高温使用寿命的良好候选材料。