Preparation Of Modified Expanded Graphite

To solve poor oxidation resistance and structural alteration at high temperature,the physical and chemical conditions of preparing EG modified by ZrOCl₂,[CH₃（CH₂）₃O]₄Ti and SiCl₄ were studied to remove-COOH and-OH on the surface of EG,and to repair the point defects on the network,so as to lay a theoretical foundation for the application of EG.We can get the following main conclusions:（1）When the treatment temperature increased from 1550～1650℃,graphitization degree increased and then decreased,-COOH and-OH decreased.The oxidation temperature increased by 158.68℃and the mass loss decreased by 58%.When the impregnation time increased from 30～90 min,graphitization degree increased,but-COOH and-OH had no obvious change;when the concentration of impregnation solution increased from 0.057～0.092 wt%,graphitization degree increased and then decreased.The best temperature is 1600℃,the soaking time is 90 min,and the concentration is0.075 wt%.（2）When the treatment temperature was from 1200～1400℃,the graphitization degree,Ti-C bond and Ti C content increased all the time,the O-Ti bond had no obvious change,the oxidation temperature increased by 142℃,the mass loss decreased by 69%;when the concentration of impregnation solution increased from 0.057～0.092 wt%.The degree of graphitization increased all the time,while-COOH,-OH and O-Ti had no obvious change.The best temperature is 1400℃,and the concentration is 0.092 wt%.（3）When the treatment temperature was from 1300～1500℃,the mass loss decreased by 72%;when the concentration of impregnation solution increased from0.057～0.092 wt%,graphitization degree increased.The best temperature is 1400℃,and the concentration is 0.075 wt%.Figure 52;Table 9;Reference 63...