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通过原位热缩聚、模压成型、高温烧结制备了中间相炭微球/碳纳米管复合块体材料,采用热重分析和恒温氧化方法研究了碳纳米管对中间相炭微球抗氧化性能的影响。结果表明:原位添加适当比例的碳纳米管可以增强中间相炭微球的抗氧化性能。随着碳纳米管含量的增加,碳化处理后的炭材料微晶层间距变小,抗氧化性能增强;当添加5%碳纳米管时,样品初始失重温度提高了40℃,氧化10小时后质量损失仅为8.55%;但过多的碳纳米管会使微球粒径分布变宽,球形度变差,导致块体材料气孔率增加,降低了其抗氧化性能。
The mesocarbon microbeads / carbon nanotube composite block materials were prepared by in situ thermal polycondensation, compression molding and high temperature sintering. The effects of carbon nanotubes on the oxidation resistance of mesocarbon microbeads were investigated by means of thermogravimetry and isothermal oxidation influences. The results show that adding appropriate proportion of carbon nanotubes in situ can enhance the oxidation resistance of mesocarbon microbeads. With the increase of the content of carbon nanotubes, the spacing of microcrystalline layer of the carbon material after carbonization becomes smaller and the oxidation resistance is enhanced. When 5% carbon nanotubes are added, the initial weight loss temperature of the sample is increased by 40 ° C., and the mass after 10 hours of oxidation The loss is only 8.55%. However, too much carbon nanotubes will make the microsphere size distribution widen and the sphericity worsens, resulting in the increase of the porosity of the bulk material and the decrease of its oxidation resistance.