Oxidation-inhibited carbonous materials

Details Oxidation-inhibited carbonous materials Oxidation-inhibited carbonous materials

1985-12-06

1990-01-09

Nelson, Peter A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428554, 428557, 428149, 428408, B22F 701

Patent

active

048927902

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.

REFERENCES:
patent: 4101354 (1978-07-01), Shaffer
patent: 4321298 (1982-03-01), Shaffer et al.
patent: 4439382 (1984-03-01), Joo et al.
patent: 4515847 (1985-05-01), Taverna et al.

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