Abstract The large-scale fibrous/aerogels composites are prepared by using zirconia fibrofelt (ZFF) as skeleton to give high strength and ZrO 2 -SiO 2 aerogels (ZSA) as filler to give excellent thermal insulation through vacuum impregnation. The ZFF/ZSA with a low density of 0.302 g/cm 3 and a high porosity (89%) exhibits large size of 180 mm in length, 180 mm in width and 25 mm in height which is larger than other fibrous aerogels. Meanwhile, the ZFF/ZSA exhibits high compressive strength of up to 0.17 MPa which is approximately six times higher than that of ZFF (0.028 MPa). The ZFF/ZSA shows a much lower thermal conductivity of 0.0341 W m −1 K −1 at room temperature and 0.0460–0.096 m −1 K −1 during 500 °C and 1100 °C which are lower than that of conventional fibrous materials, indicating its excellent thermal insulation property in a wide temperature range, and the thermal insulation mechanism is analyzed. Thus, the large-scale, low density, high strength, and low thermal conductivity of ZFF/ZSA composites show enormous potential application in the fields of architecture, engineering pipes and aerospace for thermal insulation and protection.

中文翻译：

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用于隔热的ZrO 2 纤维毡/ZrO 2 -SiO 2 气凝胶复合材料的大规模超低热导率

摘要 以氧化锆纤维毡（ZFF）为骨架以提供高强度，以ZrO 2 -SiO 2 气凝胶（ZSA）为填料，通过真空浸渍提供优异的隔热性能，制备了大规模纤维/气凝胶复合材料。具有 0.302 g/cm 3 低密度和高孔隙率 (89%) 的 ZFF/ZSA 表现出长 180 毫米、宽 180 毫米和高 25 毫米的大尺寸，比其他纤维气凝胶大。同时，ZFF/ZSA 表现出高达 0.17 MPa 的高抗压强度，大约是 ZFF (0.028 MPa) 的六倍。ZFF/ZSA 的导热系数在室温下为 0.0341 W m -1 K -1，在 500 °C 和 1100 °C 期间为 0.0460–0.096 m -1 K -1，低于传统纤维材料的导热率，表明其在较宽的温度范围内具有优异的隔热性能，并分析了其隔热机理。因此，ZFF/ZSA复合材料的大尺寸、低密度、高强度和低导热性在建筑、工程管道和航空航天领域的隔热和保护方面显示出巨大的应用潜力。