炭纤维粉改性中间相沥青基泡沫炭的结构与性能

Structure and properties of mesophase pitch-based carbon foam modified by carbon fiber powder

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。

Carbon foam was fabricated by foaming at high temperature using AR mesophase pitch containing PAN-based carbon fiber powder precursor. The effects of fiber powder content and graphitization temperature on microstructure, strength and thermal conductivities were discussed. The results show that, the addition of carbon fiber powder can improve the compressive strength and thermal conductivity obviously. The stress-introduced graphitization between fiber and carbon matrix can improve the graphitization in micro-area, so that the grain size of microcrystalline increases and then thermal conductivity also increases. When the mass fraction of carbon fiber powder is 6%, the maximum value of the compressive strength of carbon foam is 18 MPa. The compressive strength and thermal conductivity of graphite foam are 8.1 MPa and 83 W/（m·K）, respectively, and the thermal conductivity is two times higher than that of the graphite foam without the carbon fiber powder.