High strength SiC reinforced Si₃N₄ ceramics aerogels (SCSNCAs) were fabricated via foam-gelcasting and subsequent catalytic reaction, utilizing industrial Si and melamine as raw materials, a small amount of incidental Fe impurities in Si powder as the catalyst and cetyltrimethylammonium bromide (CTAB, the amount of 0.075 wt%) as foaming agent. The effects of solid loading level and reaction temperature on phase composition, microstructure and mechanical properties of the as-prepared SCSNCAs were examined. The aerogels prepared at 1423 K using a slurry of solid loading level of 30 wt% (Si:melamine = 3:1, mass ratio) had porosity of 91.9%, having compressive and specific strength of 0.8 MPa and 3.8 MPa·cm³ g⁻¹ exhibited the lowest thermal conductivity of 0.066 W/(m·K) at 473 K. Compared with the control sample (without melamine, i.e., Si₃N₄ aerogels without the formation of SiC), the specific strength of the SCSNCAs increased by about 10%, which was attributed to the additional reinforcement from SiC whiskers formed in the Si₃N₄ matrix of the aerogels.

高强度的SiC增强的Si ₃ Ñ _4个陶瓷气凝胶（SCSNCAs）制备了通过泡沫凝胶注模成型和随后的催化反应，利用工业Si和三聚氰胺等为原料，在Si粉末附带的Fe杂质作为催化剂和十六烷基三甲基溴少量（ CTAB，用量0.075 wt%)作为发泡剂。研究了固体负载水平和反应温度对所制备的 SCSNCA 的相组成、微观结构和机械性能的影响。在 1423 K 下使用固体负载水平为 30 wt%（Si:三聚氰胺 = 3:1，质量比）的浆液制备的气凝胶孔隙率为 91.9%，抗压强度和比强度为 0.8 MPa 和 3.8 MPa·cm ³  g ⁻¹在 473 K 时表现出最低的热导率 0.066 W/(m·K)。与对照样品（不含三聚氰胺，即未形成 SiC 的Si ₃ N ₄气凝胶）相比，SCSNCA 的比强度增加了约10%，这归因于气凝胶的 Si ₃ N ₄基质中形成的 SiC 晶须的额外增强。