Oxidation-inhibited carbonous materials
US4892790A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1985 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Dec 6, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Composites comprising high-temperature fibers reinforcing a carbonous matrix are protected from oxidation by a B.sub.2 O.sub.3 -based glass which includes a refractory oxide to stabilize the viscosity of the glass. Precursors of B.sub.2 O.sub.3 and the refractory oxide are dispersed into a carbon char-yielding material; the material is used to impregnate sheets of fibers; the sheets are laid up as plies; and the laid-up plies are carbonized and graphitized using heat and pressure to form a composite structure. The composite structure is then coated with an additional mix of char-yielding material and precursors, and the coated structure is heated to carbonize the material and leave a seal coat on the structure. Then, an outer coating of a refractory material is deposited on the structure. Oxygen which seeps through the seal coat is initially scavenged at high temperatures by the RO and B.sub.2 O.sub.3 precursors, converting the same to a B.sub.2 O.sub.3 -RO glass which protects both the internal pore surfaces of the composite as well as the outer structural surfaces from oxidation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.