▎ 摘　　要

NOVELTY - Preparing high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material comprises (1) uniformly mixing polycarbosilane, polymer thickener, ferrocene composite and organic solvent to obtain nanofiber precursor mixed solution, (2) performing electrospinning with nanofiber precursor mixed liquid as electrospinning solution, (3) preoxidizing polycarbosilane nanofibers to obtain preoxidized polycarbosilane nanofibers, (4) pyrolyzing pre-oxidized polycarbosilane nanofibers, (5) uniformly mixing silicon carbide nanofibers, water, infrared sunscreen, binder, foaming agent and graphene oxide to obtain airgel precursor mixed solution, (6) pre-freezing and freeze-drying airgel precursor mixed solution to obtain silicon carbide nanofiber airgel composite material, and (7) performing thermal annealing treatment on silicon carbide nanofiber airgel composite material. USE - The method is useful for preparing high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material. ADVANTAGE - The material: can be prepared in large quantities; reaches temperature resistance limit to 1100-1200℃; and has thermal conductivity lower than 0.059 W/m×K at high temperature of 900℃ and rebound rate is 96-100% when the maximum compression deformation is ≮ 80%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material obtained by the preparation method, where the high temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material has the temperature-resistant limit of the high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material in aerobic environment is 1100-1200℃, the room temperature thermal conductivity of the high temperature and radiation resistant elastic silicon carbide nanofiber airgel material is ≯ 0.032 W/(m×K), the thermal conductivity at 900℃ is lower than 0.059 W/(m×K), the maximum compression deformation of the high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material is ≮ 80%, the rebound rate is 96-100%, the minimum density of the high temperature and radiation resistant elastic silicon carbide nanofiber airgel material is 7 mg/cm3, the diameter of the nanofibers contained in the high temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material is 800-800 nm, and/or the high-temperature-resistant and radiation-resistant elastic silicon carbide nanofiber airgel material can be prepared in large batches.