ABSTRACT Hierarchically porous diatomite ceramics were fabricated by the freeze-drying method using Xanthan Gum as a gelling agent. They showed high porosity of 84.8–92.7% and a low thermal conductivity value of 0.061–0.123 W m−1 K−1 (tested at 473–1073 K). Their compressive strength increased with increasing the preparation temperature and/or the solid loading level. The porous sample with 15 wt-% solid loading, after 2 h firing at 1373 K, showed a porosity level of 92.7%, a compressive strength of 0.11 ± 0.01 MPa and a thermal conductivity value as low as 0.061 ± 0.001 W m−1 K−1. The above data indicated that hierarchically porous diatomite ceramics prepared by the present freeze-drying method possessed reasonable mechanical strength but superior thermal insulation properties.

中文翻译：

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高孔隙率低导热多孔硅藻土陶瓷的冷冻干燥制备

摘要 采用黄原胶作为胶凝剂，采用冷冻干燥法制备了分层多孔硅藻土陶瓷。它们显示出 84.8-92.7% 的高孔隙率和 0.061-0.123 W m-1 K-1（在 473-1073 K 下测试）的低热导率值。它们的抗压强度随着制备温度和/或固体负载水平的增加而增加。具有 15 wt-% 固体负载的多孔样品，在 1373 K 下烧制 2 小时后，孔隙率为 92.7%，抗压强度为 0.11 ± 0.01 MPa，热导率值低至 0.061 ± 0.001 W m-1 K-1。以上数据表明，采用本冻干法制备的分级多孔硅藻土陶瓷具有合理的机械强度和优良的隔热性能。