Composition for SiC pack cementation coating of carbonaceous substrates
AssigneeBP Chemicals (Hitco) Inc.
InventorsIra C. Schwartz, Orlando L. Noche, Keith Klein
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Abstract
This invention relates to an improved pack mixture composition useful for the formation of a SiC pack cementation coating for protecting a carbonaceous substrate from degradation at temperatures above about 800.degree. F. comprising: Si from about 15% to about 50% by weight of the total composition; B up to about 25% by weight of the total composition when present; SiO.sub.2 from about 0.01% to about 3% by weight of the total composition; and SiC from about 40% to about 85% by weight of the total composition and method thereof. The invention further relates to a cork release agent composition for providing the clean release of spent pack composition from a carbonaceous substrate.
Claims14
A method for protecting a carbonaceous substrate from degradation at temperatures above about 800.degree. F. comprising:
- a) preparing a pack mixture composition of from about 15% to about 50% Si, 0% up to about 25% B, from about 0.01% to about 3% SiO.sub.2 and from about 40% to about 85% SiC, all by total weight of said pack mixture composition;
- b) coating said carbonaceous substrate with a release agent;
- c) surrounding said release agent-coated carbonaceous substrate with said pack mixture composition;
- and
- d) firing said carbonaceous substrate for a period of time sufficient to effectuate the formation of a protective SiC pack cementation coating on said carbonaceous substrate.
Dependencies are inferred from the claim text.