MANUFACTURING PROCESS FOR ACTIVE COMPOSITE BASED ON EXPANDED GRAPHITE

摘要

PROBLEM TO BE SOLVED: To increase production efficiency of an active composite having a given final density and thickness by making a preliminary densified preform of expanded graphite powder and impregnating the preform in a solution comprising an active agent, solvent and a wetting agent, and then drying and complementally densifying the preform. ;SOLUTION: Natural graphite based expanded graphite powder is compressed by adding into a mold and preliminarily densified to form a preform having an intermediate density of 0.01 to 0.11 and an intermediate thickness of 30 to 1,000 mm. Then, the preform is dipped and impregnated in a impregnation solution comprising an active ingredient selected from MnCl₂, NiCl₂, BaCl₂, SrCl₂, MgBr₂, CaCO₃ or the like, a wetting agent selected from polyalcohols, polyfluorides, polysiloxanes, and a polar solvent such as water, acetone or the like. The impregnated preform is complementally densified by heating and drying at about 220°C for about 30 min. in a furnace to produce an expanded graphite based active composite having the final density of 0.07 to 0.6 and the final thickness of 20 to 100 mm. The active composite is wound up on a lamination layer or a mandrel to form a composition block.;COPYRIGHT: (C)1996,JPO