PRODUCTION-SCALE FORMATION OF ULTRAHIGH PURITY CARBIDE POWDERS

摘要

A method of forming ultrahigh purity carbide powders on a production scale which comprises blending metal oxide powders with elemental carbon powders and a partially polymerized furfuryl alcohol binder together with a suitable polymerization catalyst, extruding, polymerizing the binder, heating to 840 DEG C for 48 hours in a soft vacuum, heating to 2,200 DEG C for 1 hour in a helium atmosphere, cooling, crushing, and then heating to 2,000 DEG C for 24 hours under a vacuum.