초록 ▼

Carbon-carbon composites consisting of graphite fibers reinforcing a carbon matrix are protected from oxidation by a B2O3 glass coating which includes a refractory oxide to stabilize the viscosity of the glass. Precursors of B2O3 and the refractory oxide are dispersed into a resin, the resin is used

Carbon-carbon composites consisting of graphite fibers reinforcing a carbon matrix are protected from oxidation by a B2O3 glass coating which includes a refractory oxide to stabilize the viscosity of the glass. Precursors of B2O3 and the refractory oxide are dispersed into a resin, the resin is used to impregnate fibrous graphite or fibrous graphitizable material, the sheets are laid up as plies and the laid-up plies are carbonized and graphitized using heat structure. The composite structure is then coated with an additional mix of resin and precursors and the coated structure is heated to carbonize the resin and leave a seal coat on the structure. Then an outer shell of a refractory material is deposited on the structure.

대표청구항 ▼

An oxygen-resistant, high-temperature composite comprising a structure which includes a carbonous matrix formed with interstices throughout and reinforcing, high-temperature fibers disposed within said matrix, a metal or metalloid, in elemental form and/or as an oxidizable moiety, dispersed througho

An oxygen-resistant, high-temperature composite comprising a structure which includes a carbonous matrix formed with interstices throughout and reinforcing, high-temperature fibers disposed within said matrix, a metal or metalloid, in elemental form and/or as an oxidizable moiety, dispersed throughout said structure, said metal or metalloid comprising between about 5 and about 200 weight percent of said matrix, and boron, in elemental form and/or as an oxidizable moiety, dispersed throughout said strccture, said boron comprising between about 3 and about 300 weight percent of said matrix; said boron and said metal or metalloid oxidizing when exposed to a high-temperature, oxidizing environment to form boron oxide and a metal oxide or a metalloid oxide within the interstices and at the surface of said matrix; at high temperatures the metal oxide or metalloid oxide which forms stabilizing the viscosity of the molten phase of the boron oxide which forms.