Heat treatment of mesocarbon microbeads under high pressure

✍ Scribed by M. Inagaki; Y. Tamai; S. Naka; Y. Yamada; H. Honda

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 548 KB
• Volume: 14
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(76)90108-1

✦ Synopsis

Mesophase spherules separated from pitches and asphalt by quinoline (mesocarbon microbeads) were heat-treated under a pressure of 5 kbar at 1300-2ooo"C for 1 hr. The as-separated microbeads gave a bulk density of 1.8-1.9 g/cm' after heat treatments at high temperatures. The pre-heated microbeads gave high bulk density above 2.0 g/cm" after high temperature heat treatment. The mesocarbon microbeads were found to have low graphitizability under pressure. The as-separated microbeads showed a heterogeneous process of graphitization, but the maximum amount of the graphitic component was only 60% even after 2OOOVtreatment under 5 kbar. On the pre-heated microbeads, almost no graphitization was observed. The spherical shape of the as-separated microbeads was lost even after the heat treatments at low temperatures under 5 kbar. However, the pre-heated microbeads showed the tendency to keep the original spherical shape even after heat treatment at 1900°C.