Oxidation resistant carbon and method for making same

Details Oxidation resistant carbon and method for making same Oxidation resistant carbon and method for making same

1987-12-03

1994-02-15

Walsh, Donald P.

Stock material or miscellaneous articles

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

428698, 428699, 428702, 427249, 427279, 501 42, 501 49, 501 90, 501 91, 501 92, 501 96, 501 97, 501 99, B32B 900

Patent

active

052865657

ABSTRACT:
A coated carbon body having improved resistance to high temperature oxidation and a method for producing the coated carbon body are described. The coated carbon body comprises a carbon body, an intermediate glass forming coating and an outer refractory coating on the intermediate coating. The body has a converted porous layer formed by etching and reacting the body with boron oxide and the resulting converted layer contains interconnecting interstices and boron carbide formed by the reaction of the boron oxide and the carbon body. The method comprises contacting a carbon body with boron oxide at an elevated temperature sufficient to cause the reaction between the carbon body and boron oxide to form a converted porous layer which contains interconnecting interstices in the body and boron carbide and then applying the glass forming coating over the converted layer. Preferably an outer refractory coating is applied over the glass forming coating. The glass forming coating comprises compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof. Additionally, both the refractory outer coating and the glass forming coating can contain compounds selected from the group consisting of silicon nitride, silicon oxynitride, and mixtures thereof.

REFERENCES:
patent: 4515860 (1985-05-01), Holzl

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