鳞片石墨三辊研磨减薄制备低碳含碳耐高温材料用微纳米石墨薄片的技术研究

Micro-Nano Graphite Sheets for Low Carbon Carbon-Containing Refractories by Exfoliating Thick Graphite Flakes via Three-Roll Milling

摘要:

本论文对三辊研磨剥离技术在低碳含碳耐火材料中应用进行理论分析的基础上,以鳞片石墨(FG)为原料、酚醛树脂(PF)作为研磨介质,采用三辊研磨机差速剥离得到微纳米石墨薄片(GNP),研究了剥离次数对剥离产物结构和形貌的影响。以酒精为溶剂,对FG经三辊研磨剥离得到的产物进行浸泡、超声清洗以排除PF后再干燥,并对产物进行了XRD、SEM、TEM和粒度分析等表征,研究发现尺寸~150微米级、厚度为几微米级FG在剥离过程中厚度不断减薄,尺寸也有减小,当剥离次数逐渐增加大到8次甚至16次时,剥离得到了尺寸为10-30 μm、厚度达30-100 nm的GNP。相关技术能够应用到低碳、超低碳耐火材料工业用以降低碳含量以及推广到航空工业树脂基碳纤维复合材料中用以改善树脂界面结合强度。

Abstract:

Based on the theoretical analysis of the application of Three-Roller Milling (TRM) exfoliating technology in low-carbon carbon-containing refractories, graphite nanoplatelets (GNP) were obtained by exfoliating flake graphite (FG) in phenol formaldehyde resin (PF) via TRM in this study. The effects of the exfoliating times on the structure and morphology of the products were investigated. By using alcohol as the solvent, the product exfoliated from FG by TRM was soaked and washed by ultrasound to remove PF, followed by drying, and then characterized by XRD, SEM, TEM and particle size analysis. It was found that the original FG with 150 μm in size and several microns in thickness was constantly exfoliated. When the exfoliating times were increased gradually to 8 or even 16 times, GNPs were obtained with a size of 10-30 μm and a thickness of 30-100 nm. This technical ideal can be applied in low-carbon and ultra-low carbon refractory industries to reduce carbon content, as well as in resin based carbon fiber composites for aviation industry to improve resin strength.