Porous α-Si₃N₄ whiskers bonded/reinforced SiC (Si₃N_4(w)/SiC) ceramics were successfully prepared at as low as 1473 K for 2 h, via a combined foam-gelcasting and catalytic nitridation route using commercial Si and SiC powders containing some Fe impurity as the main raw materials. Small pores (0.03–5 μm) left by the packing of raw material particles and interlocking of in-situ formed Si₃N₄ whiskers coexisted with large ones (8–400 μm) resultant mainly from the foaming process. The impurity Fe from the raw materials Si and SiC acted as an internal catalyst, accelerating the nitridation of Si by increasing the bond length and weakening the bond strength in the N₂ molecules adsorbed on it. As-prepared Si₃N_4(w)/SiC porous ceramics contained 71.53% porosity and had flexural and compressive strengths of 5.60 ± 0.69 MPa and 12.37 ± 1.05 MPa, respectively.

多孔α-的Si _3个Ñ ₄晶须粘接/加固碳化硅（SI ₃ Ñ _{4（瓦特）} / SiC）的成功在低至制备1473 K中2小时陶瓷，通过使用市售Si组合泡沫凝胶注模成型和催化氮化路线以及以Fe为主要成分的SiC粉。原料颗粒的堆积和原位形成的Si ₃ N _4的互锁留下了小孔（0.03–5μm）晶须与较大的晶须（8–400μm）共存，主要是起泡过程产生的。原料Si和SiC中的杂质Fe充当内部催化剂，通过增加键长并削弱吸附在其上的N ₂分子的键强度来促进Si的氮化。所制备的Si ₃ N _4（w） / SiC多孔陶瓷具有71.53％的孔隙率，并且弯曲和压缩强度分别为5.60±0.69MPa和12.37±1.05MPa。