Platelet‐like anorthite based porous ceramics with improved mechanical strength were fabricated via direct gelcasting and firing at 1223‐1473 K using CaCO₃, Al(OH)₃, and SiO₂ powders as the raw materials, along with H₃BO₃ and melamine sintering/crosslinking agents. Based on density functional theory calculations, H₃BO₃ promoted the formation of platelet‐like anorthite at a relatively low temperature via covering the {130} facet of anorthite and reducing the corresponding adsorption energy, which led to the preferential growth along the a‐ and b‐axes. The optimal amount of H₃BO₃ for the anorthite platelet formation was 0.9 wt%. The porous anorthite sample with an original solid content of 22.0 wt%, after firing at 1373 K, contained 71.0% porosity and exhibited a compressive strength as high as 5.7 MPa, which were comparable or even superior to those of porous anorthite ceramics prepared previously at a much higher temperature (1573‐1723 K), indicating that the preparation strategy reported in this paper is feasible in fabricating high‐performance porous anorthite ceramics at a much milder condition. The thermal conductivity of the porous anorthite sample at 1073 K was as low as 0.266 W/(m·K), much lower than that (0.645 W/(m·K)) of the control sample, suggesting that the former could be potentially used for thermal insulation at high temperatures.

中文翻译：

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低温制备由钙长石薄片组成的高性能多孔陶瓷

通过以CaCO ₃，Al（OH）₃和SiO ₂粉末为原料，并以H ₃ BO ₃和三聚氰胺为原料，通过直接凝胶浇铸和在1223-1473 K上焙烧，制造出具有改善的机械强度的片状钙长石基多孔陶瓷。烧结/交联剂。基于密度泛函理论计算，H ₃ BO ₃促进形成片状钙长石在经由覆盖的钙长石的{130}面和还原相应的吸附能，这导致沿着优先生长相对低的温度一-和b轴。H ₃ BO的最佳用量对于钙长石，血小板形成的₃为0.9重量％。在1373 K焙烧后，原始固形物含量为22.0 wt％的多孔钙长石样品的孔隙率为71.0％，抗压强度高达5.7 MPa，与先前制备的多孔钙长石陶瓷相当甚至更好。温度要高得多（1573-1723 K），这表明本文报道的制备策略对于在温和得多的条件下制造高性能多孔钙长石陶瓷是可行的。多孔钙长石样品在1073 K时的热导率低至0.266 W /（m·K），远低于对照样品的（0.645 W /（m·K）），这表明前者可能用于高温隔热。