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AssigneeThe United States of America as represented by the United States Department of Energy
InventorsZane L. Ardary, Samuel T. Benton
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The described development is directed to a coating formulation for filling surface irregularities in graphite articles such as molds, crucibles, and matched die sets used in high-temperature metallurgical operations. The coating formulation of the present invention is formed of carbon black flour, thermosetting resin and a solvent for the resin. In affixing the coating to the article, the solvent is evaporated, the resin cured to bond the coating to the surface of the article and then pyrolyzed to convert the resin to carbon. Upon completion of the pyrolysis step, the coating is shaped and polished to provide the article with a surface restoration that is essentially similar to the original or desired surface finish without the irregularity.
A method for filling a surface irregularity in a surface of a carbonaceous structure comprising the steps of contacting a surface portion of a carbonaceous structure containing a surface irregularity with a sufficient quantity of a coating formulation comprising a mixture of 70 to 80 wt % carbon-black flour, 30 to 20 wt % of a particulate thermosetting resin precursor dissolved in a solvent therefore with said solvent being in a sufficient concentration to provide the mixture with a paste-like consistency for filling the surface irregularity, removing the solvent from the coating formulation, curing the resin precursor, and pyrolyzing the resulting polymer to provide a carbonaceous coating adherent to said surface portion of the carbonaceous structure.
Dependencies are inferred from the claim text.