Catalytic graphitization of carbon/carbon composites by lanthanum oxide

• Published in: Journal of rare earths 2012-02, Vol.30 (2), p.128-132
• Main Author: 张灿 路贵民 孙泽 于建国
• Format: Article
• Language: English
• Subjects: C/C composites; Carbon; Catalysis; Catalysts; catalytic graphitization; Electrical resistivity; Graphitization; La2O3; lanthanum oxide; Lanthanum oxides; Rare earth compounds; Rare earth metals; rare earths; 低电阻率; 催化石墨化; 扫描电子显微镜; 氧化镧; 石墨化过程; 碳/碳复合材料; 稀土催化剂
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60008-8

Graphitized carbon/carbon composites were prepared by the process of catalytic graphitization with the rare-earth catalyst, lantha-num oxide （La2O3）, in order to increase the degree of graphitization and reduce the electrical resistivity. The modified coal tar pitch and coal-based needle coke were used as carbon source, and a small amount of La2O3 was added to catalyze the graphitization of the disordered carbon materials. The effects of La2O3 catalyst on the graphitization degree and microstructure of the carbon/carbon composites were investi-gated by X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. The results showed that La2O3 promoted the formation of more perfect and larger crystallites, and improved the electrical/mechanical properties of carbon/carbon composites. Carbon/carbon compos-ites with a lower electrical resistivity （7.0 ？？？m） could be prepared when adding 5 wt.% La2O3 powder with heating treatment at 2800 oC. The catalytic effect of La2O3 for the graphitization of carbon/carbon composites was analyzed.