Porous intermetallic membrane with extensive interconnected pores are potential candidates as functional materials for high-temperature particulate matter (PM) capturing. However, fabrication of intermetallic membrane with a combined performance of high filtration efficiency and high-temperature oxidation resistance remains a challenge. To tackle this issue, a hierarchical micro-/nano-dual-scale sized pores was constructed on the inner cell walls of a porous support through mutual diffusion and chemical reaction. Benefited from its hierarchical micro/nano-dual-scaled pore structural features, the high Nb containing TiAl-based porous composite microfiltration membrane demonstrates ultrahigh PM_>2.5 removal efficiency (99.58%) and favorable oxidation/sulfidation performance at high temperature. These features, combined with our experimental design strategy, provide insight into designing high-temperature PM filtration membrane materials with enhanced performance and durability.

具有广泛的相互连接的孔的多孔金属间膜是用作高温颗粒物（PM）捕获的功能材料的潜在候选者。然而，具有高过滤效率和高温抗氧化性的组合性能的金属间膜的制造仍然是挑战。为了解决这个问题，通过相互扩散和化学反应，在多孔载体的内部细胞壁上构建了分级的微米/纳米级尺寸的孔。得益于其分级的微/纳米级双孔结构特征，高含铌TiAl基多孔复合微滤膜具有超高PM _{> 2.5}高温下的去除效率（99.58％）和良好的氧化/硫化性能。这些功能与我们的实验设计策略相结合，为设计具有更高性能和耐用性的高温PM过滤膜材料提供了见识。