阅读说明：本技术 一种碳化硅纳米纤维气凝胶的制备方法 (Preparation method of silicon carbide nanofiber aerogel ) 是由 陈建军 施嘉辉 侯红臣 郑旭鹏 罗小雨 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种碳化硅纳米纤维气凝胶的制备方法。包括以下步骤：1)通过溶胶凝胶法在碳纤维表面包覆SiO-2凝胶；2)将表面包覆SiO-2凝胶的碳纤维聚集体进行分散,得到蓬松的碳纤维毡；3)通过溶胶凝胶法制备SiO-2/C凝胶粉；4)将SiO-2/C凝胶粉铺设在坩埚底部,将步骤2)制备的蓬松碳纤维毡放至SiO-2/C凝胶粉上方,盖上坩埚盖；5)将步骤4)的坩埚置于高温气氛炉内,在高温条件下,制备得到碳化硅纳米纤维气凝胶。本发明制备的气凝胶由碳化硅纳米纤维三维空间交织构筑而成,孔隙结构可控,制备工艺简单,反应充分无需后续煅烧处理,产物宏观形貌可控,容易实现气凝胶大尺寸及规模化生产制备。(The invention discloses a preparation method of silicon carbide nanofiber aerogel. The method comprises the following steps: 1) coating SiO on the surface of carbon fiber by a sol-gel method 2 Gelling; 2) coating the surface with SiO 2 Dispersing the gelled carbon fiber aggregate to obtain a fluffy carbon fiber felt; 3) preparation of SiO by sol-gel method 2 C gel powder; 4) mixing SiO 2 Laying the gel powder at the bottom of the crucible, and putting the fluffy carbon fiber felt prepared in the step 2) to SiO 2 Covering a crucible cover above the gel powder; 5) and (3) placing the crucible in the step 4) into a high-temperature atmosphere furnace, and preparing the silicon carbide nanofiber aerogel under the high-temperature condition. The aerogel prepared by the invention is formed by interweaving the silicon carbide nano-fiber in three-dimensional space, the pore structure is controllable, the preparation process is simple, the reaction is sufficient, the subsequent calcination treatment is not needed,the macroscopic morphology of the product is controllable, and the large-size and large-scale production and preparation of the aerogel are easy to realize.)