As an important downstream product of graphite ore, expanded graphite is widely used in various sectors of society and has high economic value. Here we will briefly analyze the application and development of expanded graphite in recent years, hoping to promote the development of expanded graphite materials.

We will introduce the preparation methods and application of the expanded graphite. Firstly, we have summarized the usual intercalation and expansion technologies. And then we reviewed the applications of expanded graphite in environmental protection, medicine, sealing material and fire retardant areas based on the high and low temperature resistance, thermal conductivity and electrical, resilient property, cohesiveness, resilience and high adsorption property, sealing charateristics. And we also introduced its application and mechanism for the oil adsorption in detailed especially. Finally, we introduced and analyzed the application problem of expanded graphite, and proposed its future development trend too.

To explore the manufacturing process of expanded graphite compacts, we characterize their morphology and structure by means of laser particle size analyzer and scanning electron microscopy. We studied the effects of the microwave power, radiant time, the particle size of expanded graphite, the manfacturing pressure of compacting and sample amount on the thermal conductivity properties of the obtained compacts based on the orthogonal test method. It shows that the microwave power and radiant time have significant influences as low microwave power and short radiant time for microwave expansion will lead to insufficient expansion, while as high power and long time will lead to excessive burning and fracture of graphite worm. On the other sides, the manfacturing pressure of compacting, the size of expanded graphite and the sample amount have no significant effect. According to the analysis and experiments, the optimum preparation conditions of expanded graphite compacts with highest thermal conductivity are as follows: the microwave power of 700W, the radiant time of 70s, the diameter of expanded graphite of 80-100 mesh, the sample amount of 6. 0g, the manfacturing pressure of 200MPa, therefore leading to the thermal conductivity of the compact reaches 5. 78 W/(m·K) .

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