Highly porous mullite fiber-based ceramics with a three-dimensional cross structure were successfully designed and fabricated by filtration method. To address the thermal migration of silica sol, polysiloxane was introduced in the bonding system as high temperature binder to form more stable nods in the skeleton as opposed to silica sol which would migrate to the surface of fibers during the sintering process. Due to the lapped structure of mullite fibers, all products showed high porosity(74.1%∼80.9%), low density(0.554g/cm³∼0.608g/cm³) and relatively low thermal conductivity(<0.14 W/(m*K)). The reaction process of in situ porolysis and fracture mechanisms were illustrated, respectively. Besides, results showed that both sintering temperature and binder content had significant influence on the microstructure and mechanical properties of the products.

通过过滤方法成功地设计和制造了具有三维交叉结构的高多孔莫来石纤维基陶瓷。为了解决硅溶胶的热迁移问题，将聚硅氧烷作为高温粘合剂引入到粘结体系中，以在骨架中形成更稳定的结点，这与在烧结过程中迁移到纤维表面的硅溶胶相反。由于莫来石纤维的搭接结构，所有产品显示出高孔隙率（74.1％~80.9％），低密度（0.554克/厘米³ ~0.608g /厘米³）和较低的导热率（<0.14 W /（m * K））。分别阐述了原位热解反应过程和断裂机理。此外，结果表明，烧结温度和粘结剂含量对产品的微观结构和力学性能都有显着影响。