The porous lithium aluminosilicate (LAS) ceramics with controllable pore structure were fabricated by gel-casting method. The porosity, pore structure, compression strength, gas permeability, and coefficient of thermal expansion (CTE) of the porous LAS ceramics with different monomer content were investigated. The sample with 5 wt.% monomer content has maximum value of compression (26.62 ± 0.54 MPa). When the monomer content increased to 20 wt.%, the porosity, Darcian gas permeability, and thermal expansion coefficient increased to maximum (63.66 %, 13.3 × 10⁻¹³ m², and 1.1–2.6 × 10⁻⁶ K⁻¹). The non-Darcian gas permeability showed irregular variation (1.35–3.61 m) with the increase of monomer content. A thermal vibration model was induced to investigate the effect of temperature and monomer content on the CTE. The results showed that the CTE increased with the increase of temperature due to the nonlinear thermal vibration of the atoms in lattice and the asymmetry of the force between particles.

采用凝胶浇铸法制备了孔结构可控的多孔铝硅酸锂陶瓷。研究了不同单体含量的多孔LAS陶瓷的孔隙率，孔结构，抗压强度，透气性和热膨胀系数（CTE）。单体含量为5 wt％的样品具有最大压缩值（26.62±0.54 MPa）。当单体含量增加到20 wt。％时，孔隙率，达西透气性和热膨胀系数增加到最大值（63.66％，13.3×10 ^-13 m ²和1.1–2.6×10 ^-6 K ^-1）。随着单体含量的增加，非达拉斯气体渗透率显示出不规则的变化（1.35-3.61 m）。引入热振动模型以研究温度和单体含量对CTE的影响。结果表明，由于晶格中原子的非线性热振动和粒子间力的不对称性，CTE随温度的升高而增加。