Coated carbonaceous articles and method for making same

Details Coated carbonaceous articles and method for making same Coated carbonaceous articles and method for making same

1988-07-29

1994-07-19

Nelson, Peter A.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428145, 428241, 428288, 4283179, 428446, 427307, 4274197, B05D 700

Patent

active

053308387

ABSTRACT:
A method for producing a protective coating on the surface of a carbonaceous substrate is described. A substantially uniform coating of a liquid or solid precursor material is provided on the surface of the substrate. The precursor material is one which has boron-oxygen bonds and is substantially non-reactive with the substrate at a first relatively low temperature and is capable of reacting with the substrate at a second temperature which is substantially higher than the first temperature. The substrate is then raised to the second temperature to react the coating with the substrate to form a porous region of substantially uniform depth in the substrate surface. This region contains interconnecting interstices and boron carbide. The interconnecting interstices are then at least partially filled with a glass forming material such as boron, boron oxide, boron carbide, silicon, silicon alloy, silicon dioxide, silicon nitride, silicon oxynitride, germania, and mixtures thereof. A refractory coating may then be deposited on the filled layer. Also described is a coated article produced in accordance with the described method.

REFERENCES:
patent: 4397901 (1983-08-01), Warren
patent: 4515860 (1985-05-01), Holzl
patent: 4795677 (1989-01-01), Gray
U.S. patent appln. Ser. No. 873,004, Jun. 11, 1986.
U.S. patent appln. Ser. No. 131,479, Oct. 7, 1987.

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