Abstract: A method is disclosed for depositing finely divided solid additive upon surfaces of carbon cloth layer components of a carbonaceous article. The method comprises placing a layer of carbon cloth on a support, beneath a dispersion chamber, dispersing the powdered particulate additive within the chamber by blowing with a stream of gas (preferably nitrogen); allowing the additive to settle; and repeating this routine until the desired thickness of carbon cloth layers and powder is accumulated.

Abstract: Resurfaced brake discs comprise a carbon disc and a wide tape of wear resistant material applied to the periphery of the disc, the tape being cut on one or both sides of the disc to allow the tape to be folded over the wearing surface of the disc. The tape is impregnated with a curable resin and heated under pressure to form a strongly adherent friction surface on the disc. Boron-containing or other additives may be added to the tape to improve friction qualities or to increase the oxidation resistance of the surface. Additional resin impregnations and heat treatments may be employed to strengthen the tape surface. The method is not limited to worn brake disc but may also be employed for resurfacing new brake discs as well.

Abstract: An oxidation inhibitant paint for coating the surfaces of carbon or graphite articles comprises a suspension of about 10 to about 35 percent finely divided elemental boron, dispersed in a thermosetting resin such as a solution of furfuryl alcohol prepolymer, furfural and maleic anhydride. Silica or boron nitride may be added to the paint mixture, a preferred paint composition having about 22 to 23 percent boron and 2 to 3 percent silica, dispersed in a resin solution of about 48 to 49 percent furfuryl alcohol prepolymer, about 48 to 49 percent furfural and about 2 to 4 percent maleic anhydride. The paint may be applied to the carbon article (e.g., by brushing, spraying, dipping or rolling) and then cured to give a firmly adherent coating of resin, silica and elemental boron. The coating is strongly resistant against thermal and mechanical stresses applied to the carbon article, protecting the carbon against oxidation at temperatures up to at least 900.degree.C.