Stock material or miscellaneous articles – Self-sustaining carbon mass or layer with impregnant or...
Patent
1986-06-11
1994-11-29
Walsh, Donald P.
Stock material or miscellaneous articles
Self-sustaining carbon mass or layer with impregnant or...
428698, B32B 900
Patent
active
053689380
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 within said converted layer, and an outer refractory coating on the intermediate coating. The body has a converted porous layer formed by etching and reacting the body with gaseous 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 intermediate glass forming coating over the converted layer and an outer refractory coating over the intermediate coating.
REFERENCES:
patent: 3131089 (1964-04-01), Grulke et al.
patent: 3306764 (1967-02-01), Lewis et al.
patent: 3978253 (1976-08-01), Sahm
patent: 4515860 (1985-05-01), Holzl et al.
Benander Robert E.
Dyer Paul N.
Holzl Robert A.
Magnotta Vincent L.
Tilley Benjamin H.
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Simmons Jemas C.
Walsh Donald P.
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