A novel mullite-bonded SiC-whisker-reinforced SiC matrix composite (SiCw/SiC, SiC whisker-to-SiC powder mass ratio of 1:9) was designed and successfully prepared. Before preparing the composite, the inexpensive lab-made SiCw was first modified by an oxidation/leaching process and then coated with Al₂O₃. The kinetics results indicate that the oxidation process can be described by improved shrinking-cylinder models. The aspect ratio of SiCw improved after modification. Subsequently, raw materials with a SiC–SiO₂–Al₂O₃ triple-layered structure were obtained after the Al₂O₃-coating process and used as feedstocks during the subsequent hot-pressing sintering. Finally, the characterization of the composites indicates that the mullite-bonded sample performs better (relative density of 93.8 ± 1.4%, flexural strength of 533.3 ± 18.2 MPa, fracture toughness of 13.6 ± 2.1 MPa m^1/2, and Vickers hardness of 20.6 ± 2.5 GPa) than the reference sample without the mullite interface. The improved toughness could essentially be attributed to the moderately strong interface bonding and effective load transfer effects of the mullite interface.

设计并成功制备了新型莫来石键合的SiC晶须增强SiC基复合材料（SiCw / SiC，SiC晶须与SiC的粉末质量比为1：9）。在制备复合材料之前，首先通过氧化/浸出工艺对廉价的实验室制造的SiCw进行改性，然后涂覆Al ₂ O ₃。动力学结果表明，可以通过改进的收缩缸模型来描述氧化过程。改性后SiCw的长径比得到改善。随后，在Al ₂ O ₃之后，获得了具有SiC-SiO ₂ -Al ₂ O ₃三层结构的原材料。-涂覆过程，并在随后的热压烧结过程中用作原料。最后，复合材料的表征表明，莫来石粘结的样品性能更好（相对密度为93.8±1.4％，抗弯强度为533.3±18.2 MPa，断裂韧性为13.6±2.1 MPa m ^1/2，维氏硬度为20.6比没有莫来石界面的参考样品高±2.5 GPa）。韧性的提高基本上可以归因于莫来石界面的中等牢固的界面粘合和有效的载荷传递效果。