石墨粉体中原位合成不同树脂制备炭/石墨复合材料及其表征

Preparation and Characterization of Carbon/Graphite Composites by Synthesizing Different Resins among Graphite Powders Using In-Situ Method

为了使石墨粉体与树脂能够更好地结合,改善碳素制品的性能,首先在石墨粉体中原位合成不同酚醛树脂,再制备成炭/石墨(C/G)复合材料;分析了原位合成不同树脂的热性能,观察了炭/石墨复合材料的微观结构,比较了不同种类、含量的树脂制备炭/石墨复合材料的性能。结果表明:在0～900℃内,原位合成硼改性酚醛树脂(B-PFR)和邻甲环氧酚醛树脂(OCE-PFR)的热稳定性能较热塑性酚醛树脂(TP-PFR)和热固性酚醛树脂(TS-PFR)的好;原位合成的树脂经焙烧后,B-PFR-C/G中石墨颗粒和孔隙分布较均匀,其次为TP-PFR-C/G和TS-PFR-C/G;B-PFR-C/G的综合性能更好,树脂质量分数为35%时其密度、硬度、抗压强度可分别达到1.58g·cm^(-3),47.5 HS,31.8 MPa。

In order to combine the graphite powders and resin better, improve the performance of carbon product, phenol-formaldehyde resin（PFR）was in-situ synthesized in the graphite powders, which was used to prepare carbon/graphite （C/G） composites. The thermal performance of different resins prepared by in-situ synthesis was analyzed. The microstructure of the composites was observed. The performance of the C/G composites prepared with different kinds and contents resins was compared. The results show that the thermal stability performance of boron PFR（B-PFR） and o-cresol epoxy PFR（OCE-PFR） were better than thermoplastic phenolic （TP） PFR （TP-PFR） and thermosetting（TS） PFR （TS-PFR） in 0～900℃. The graphite granules and holes in B-PFR-C/G distributed more evenly than those in TP-PFR and TS^PFR after calcination. The comprehensive performance of B-PFR-C/G was better, the density, hardness and compressive strength were 1.58g·cm^-3, 47. 5 HS and 31.8 MPa when the resin content was 35wt%.