Porous mullite hollow fiber membranes were prepared with a combined phase-inversion and sintering method, using three sintering additives including yttrium stabilized zirconia (YSZ), small mullite particles (SMP), and titanium oxide (TiO₂) to promote the particle sintering. The results indicated that all the three additives could improve the sintering performance of mullite hollow fiber membranes due to the decrease in activation energy of mullite grains. Both YSZ and TiO₂ could react with mullite grains to generate composite oxides (e.g., ZrSiO₄ and Al₂TiO₅) during sintering, following a reaction-sintering mechanism. Interestingly, the newly generated ZrSiO₄ was instable and further decomposed into monoclinic ZrO2 and SiO2 in the sintering process. The decomposition could avoid excessive embedment of composite oxides among mullite grains which have negative impact on mechanical strength of mullite hollow fibers. Overall, the doping of YSZ provided a better promotion effect on the sintering of mullite hollow fiber membranes, where the microstructural and mechanical properties are insensitive to the doping content and sintering temperatures, so it could be used as the candidate for the large-scale preparation of mullite hollow fibers.

采用相转化和烧结相结合的方法，采用钇稳定氧化锆（YSZ），小莫来石颗粒（SMP）和二氧化钛（TiO ₂）三种烧结添加剂来制备多孔莫来石中空纤维膜，以促进颗粒的烧结。结果表明，由于莫来石晶粒活化能的降低，三种添加剂均可改善莫来石中空纤维膜的烧结性能。YSZ和TiO ₂都可以在反应烧结过程中与莫来石晶粒反应生成复合氧化物（例如ZrSiO ₄和Al ₂ TiO ₅）。有趣的是，新生成的ZrSiO ₄在烧结过程中不稳定，并进一步分解为单斜晶ZrO2和SiO2。分解可以避免复合氧化物在莫来石晶粒中的过多嵌入，这对莫来石中空纤维的机械强度具有负面影响。总的来说，YSZ的掺杂对莫来石中空纤维膜的烧结提供了更好的促进效果，因为其显微组织和力学性能对掺杂含量和烧结温度不敏感，因此可以用作大规模制备的候选材料。莫来石空心纤维。