由中间相沥青制备泡沫炭:Fe(NO_3)_3的影响

Effect of iron nitrite on the preparation of carbon foams from mesophase pitch

以中间相沥青为前驱体制备高性能泡沫炭,在考察中间相沥青、Fe(NO3)3及其混合物热分解行为的基础上,着重研究了Fe(NO3)3对制备中间相沥青基泡沫炭的影响,揭示了Fe(NO3)3对泡沫炭孔泡结构的影响规律及其作用机制,初步研究了在泡沫炭炭化过程中形成的Fe/C之物相结构及其石墨化行为。结果表明,在不同的炭化温度下,Fe在泡沫炭中的存在形态各异;Fe物种的存在有利于提高泡沫炭的石墨化程度。

Carbon foams with high performance have been successfully prepared from mesophase pitch in the presence of iron nitrite. The effect of iron nitrite on preparation of carbon foams was focused and addressed in detail. The decomposition behavior of mesophase pitch with and without Fe （NO3 ）3 or mixed with SiO2 were studied using TG, XRD techniques, and an NOx analyzer. The carbon foams were examined using SEM and XRD. The results indicate that the presence of Fe （NO3 ）3 is advantageous to the preparation of carbon foams with well-developed and uniform cell structures. During the carbonization treatment stage, several iron species were detected at different temperatures, of which iron carbides dominate as main iron species in carbon foams obtained at 1 500 ℃. It is believed that iron species in carbon foams function, to some degree, as a catalyst for the graphitization of carbon foams.