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以Al2O3微粉和PTFE分散液为原料,经共混微粒间的挤压拉伸和低温烧结定型,得到了孔隙率45%左右的Al2O3/PTFE多孔材料。SEM结果显示该材料的微观形貌具有三维网状的缠结结构特征,在PTFE添加量10%时,制备得到的PTFE/Al2O3多孔材料的接触角为107°,具有较强的疏水性。在实验条件下,材料的孔隙率和透气率随PTFE添加量的增加而降低,而烧结温度(290~340℃)和烧结时间(5~30min)对材料的孔隙率和透气率影响不大。材料的纯水通量则随PTFE添加量的增加迅速衰减至100L/m2·h以下,而透气率可维持在0.07m3·cm/m2·h·mmHg以上。
Al2O3 / PTFE porous materials with porosity of about 45% were obtained by extruding and sintering low-temperature sintering powders with Al2O3 fine powder and PTFE dispersion as raw materials. SEM results show that the microstructure of the material has a three-dimensional network of entanglement structure characteristics, PTFE content of 10%, the prepared PTFE / Al2O3 porous material has a contact angle of 107 °, has a strong hydrophobicity. Under the experimental conditions, the porosity and permeability decreased with the addition of PTFE, while the sintering temperature (290 ~ 340 ℃) and sintering time (5 ~ 30min) had little effect on the porosity and permeability of the material. The pure water flux of the material rapidly decayed to 100L / m2 · h or less with the increase of the amount of PTFE, while the air permeability could be maintained above 0.07m3 · cm / m2 · h · mmHg.