Carbon substrate and production thereof

Details Carbon substrate and production thereof Carbon substrate and production thereof

1995-05-30

1997-03-11

Turner, Archene

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

264 291, 264 296, 264 297, 264319, 428688, C01B 3102

Patent

active

056099592

ABSTRACT:
A carbon substrate is prepared from a molded article of thermosetting resin by heat-treating in an inert atmosphere. The resin is characterized in that the content of Fe, Al, Ni, Co, Cr, and Mg insoluble in the resin is less than 1 ppm each and the content of Ca and Si insoluble in the resin is less than 2 ppm each. The thermosetting resin is further characterized in that the water content is less than 3 wt % and the ratio of the methylene carbon (CH.sub.2) connected to the hydroxyl group (OH) is less than 3% (based on the total carbon number). The carbon substrate prepared in this manner is almost free of defects and voids. It is suitable for use as the substrate of magnetic recording medium. The thermosetting resin may be a powdery or granular one which fluidizes and then cures on heating. A molded article of thermosetting resin is prepared by introducing the resin melt into a mold and curing it with heating under pressure. It is subsequently heat-treated in an inert atmosphere to give a molded article of glass-like carbon.

REFERENCES:
patent: 4582632 (1986-04-01), Rokujo
patent: 4698189 (1987-10-01), Tetzlaff
patent: 5045298 (1991-09-01), Muramatsu

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