| 摘要 |
PURPOSE:To efficiently obtain the title material having an excellent sealing property by pulverizing mesocarbon globules to less than a specified diameter when the globules having a self-sintering property are pulverized, formed without using a binder, and calcined. CONSTITUTION:Tar, pitch, etc., are heat-treated, and the self-sintering mesocarbon globules having >=10mum average diameter are separated from the pitch matrix in the heat-treated pitch. The globules are then pulverized to obtain the powder having <=5mum average particle diameter. The powder is formed without using a binder, and calcined. In this case, smaller pulverized globules are preferably used from the standpoint of the sealing property. However, excessive pulverization is not favorable from the economical point of view. Consequently, the globules are generally crushed to <=5mum, and the sealing property for gas or liq. required as the carbon for machine can be secured though it depends on a thickness of a product. |
