Coating for oxidation protection of metal surfaces

Details Coating for oxidation protection of metal surfaces Coating for oxidation protection of metal surfaces

1989-02-21

1998-04-21

Nelson, Peter A.

Stock material or miscellaneous articles

Composite

Of metal

428552, 427103, 4271262, 419 12, 419 13, B32B 1504, B22F 300, B05D 512

Patent

active

057415960

ABSTRACT:
An oxidation protection coating for metal substrate surfaces. The coating, according to a preferred embodiment, comprises an initial or first layer of a glass-ceramic, such as a barium aluminosilicate composed chiefly of baria, silica and alumina; or mullite, composed of silica-alumina or, alternatively, baria-silica. Titanium dioxide, nickel oxide or SnO.sub.2 can be added. The next layer of the coating is comprised of alumina or silicon carbide. The third or final layer is comprised of a thin layer of silica or a high-silica material, e.g., a silica containing 4% B.sub.2 O.sub.3. For a thicker third layer, particles of a dark solid, such as boron silicide, ferrous oxide, ferric oxide, nickel oxide, manganese dioxide, carbon or silicon carbide, can be incorporated. The three-layer coating provides high emittance and low catalytic activity for the recombination of oxygen and nitrogen, as well as being a hydrogen diffusion barrier.

REFERENCES:
patent: 3966790 (1976-06-01), Hindin et al.
patent: 4290847 (1981-09-01), Johnson et al.
patent: 4585752 (1986-04-01), Ernest
patent: 4879165 (1989-11-01), Smith

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