蒙脱土改性炭泡沫复合材料

Preparation of montmorillonite-modified carbon foams

以酚醛树脂、BJO-0930酚醛微球为原材料,与适量蒙脱土混合,采用模压成型法制备出酚醛泡沫前驱体,在Ar气保护下进行800℃炭化处理,得到蒙脱土改性闭孔微球型炭泡沫复合材料。探讨蒙脱土对炭泡沫微观结构、压缩强度和热导率的影响。结果表明,蒙脱土改性炭泡沫复合材料的基体相与微球相结合更紧密,孔隙率降低;压缩强度提高到25.54MPa;热导率也明显降低,800℃下的热导率降为0.588W/(m·K)。

Montmorillonite-modifled carbon foams with a closed-pore structure were prepared by compressive molding of phenolic resin, phenolic hollow microspheres and montmorillonite, followed by thermosetting and carbonization at 800 ℃ under Ar flow. The effects of the montmorillonite content on the microstructure, compressive strength and thermal conductivity of the modified foams were investigated. Results show that the hollow microspheres, carbon matrix and montmorillonite combine more closely in the modi- fied carbon foams than the unmodified one. Their compressive strength increases and the porosity decreases with increasing montmo- rillonite content from 0 to 7 wt. %. The highest compressive strength is 25.54 MPa and the lowest thermal conductivity at 800 ℃ is 0.588W/（m.K） when the montmorillonite content is 7 wt. %.