碳气凝胶薄片的制备及表面密度致密层去除工艺
Fabrication of carbon aerogel sheet and techniques of removing its dense layer
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摘要: 研究了不同密度和厚度的碳气凝胶薄片的制备及其表面致密层去除工艺。在以间苯二酚、甲醛为原料制备有机及碳气凝胶块体材料的基础上，结合自制活动式微模具成型工艺，制备了厚度在80~350 μm，密度在50~600 mg·cm-3范围内变化的碳气凝胶薄片。采用场发射扫描电镜、X射线相衬成像和表面轮廓仪-台阶仪等手段对其表面和内部微观结构进行了表征。测试结果表明，碳气凝胶薄片与块体的内部结构相同，但薄片表面存在一层和内部结构截然不同的致密层。采用不同粗糙程度的材料对薄片进行了表面微处理，成功去除该致密“皮”层。Abstract: This paper introduces the fabrication of carbon aerogel sheets with different thicknesses and densities and corresponding superficial micro-treatments. By resorcinol and formaldehyde’s polymerization reaction and via a self-made flexible mould, a series of carbon aerogel sheets were obtained. Their thicknesses range from 80 to 350 μm and densities range from 50 to 600 mg·cm-3. The sheets were characterized by field emission scanning electron microscope, X-ray phase contrast imaging method and form Talysurf profiler. The results indicate that the carbon aerogel sheet has the same inner microstructure with the bulk. However, its surface has a dense layer which is obviously different from its inner microstructure. Several materials with different roughness were used to treat the
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Key words:
- carbon aerogel /
- sheets /
- dense layer /
- superficial treatment
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