炭纤维粉改性中间相沥青基泡沫炭的结构与性能

发布时间：2018-02-07 09:33

本文关键词： 泡沫炭中间相沥青聚丙烯腈基炭纤维粉热导率石墨化　出处：《粉末冶金材料科学与工程》2017年01期 　论文类型：期刊论文

【摘要】：以添加聚丙烯腈基炭纤维粉的萘基中间相沥青为原料,采用高温自发泡法制备泡沫炭,研究炭纤维粉含量和不同石墨化温度对泡沫炭的微观结构、力学性能和导热性能的影响。结果表明,添加炭纤维粉可明显改善泡沫炭的压缩强度和热导率。纤维粉与沥青炭界面的应力石墨化作用可提高沥青炭的微区石墨化度,使其石墨微晶尺寸增大,从而泡沫炭的热导率得以提高。当炭纤维粉质量分数为6%时,泡沫炭的压缩强度达最高为18 MPa,石墨泡沫的压缩强度和热导率分别为8.1 MPa和83.0 W/(m·K),较未添加炭纤维粉的石墨泡沫的热导率(39.2 W/(m·K))提高一倍。
[Abstract]:Carbon foam was prepared by using naphthyl mesophase pitch with polyacrylonitrile-based carbon fiber powder as raw material. The microstructure of foamed carbon was studied by carbon fiber powder content and graphitization temperature. The results show that the compression strength and thermal conductivity of foamed carbon can be improved obviously by adding carbon fiber powder, and the graphitization degree of bituminous carbon can be improved by the stress graphitization at the interface between fiber powder and bituminous carbon. When the content of carbon fiber powder is 6, the thermal conductivity of foamed carbon is increased. The compression strength and thermal conductivity of graphite foam are 8.1 MPa and 83.0 W / m 路K ~ (-1), respectively, which is twice as high as that of graphite foam without carbon fiber powder (39.2 W / m 路K ~ (-1)). The compressive strength of carbon foamed carbon foam is up to 18 MPA, and the thermal conductivity of graphite foam is 8.1 MPa and 83.0 W / m 路kg ~ (-1), respectively.
【作者单位】：中南大学粉末冶金国家重点实验室;中南林业科技大学材料科学与工程学院;
【基金】：国家重点基础研究项目(2011CB605805) 中南大学粉末冶金国家重点实验室资助项目湖南省科技计划(2015WK3013) 湖南省教育厅青年基金项目(14C1187) 国家自然科学基金(51302322)
【分类号】：TB383.4;TQ127.11

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