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Christopher W Ivey

Cressie E Holcombe

Lloyd R Chapman

William Brent Webb

Steven R Schenck

Karl W Dersch

A fully inorganic boron nitride paste, containing 80 to 94% of a boron nitride paint and 6 to 20% of ceramic fibers, is provided to allow the process of manufacturing boron nitride &ldquo;shell&rdquo; coatings of 0.0313 to 0.25 inch onto ceramic substrates chosen from a wide range of densities. De-clumping of the ceramic fibers such that fiber lengths are greater than 100 micrometers and clumps are less than {fraction (3/32)} inch improves boron nitride &ldquo;shell&rdquo; layer uniformity. Boron nitride content of greater than 36 wt. % (or about 50 vol. %) in the boron nitride &ldquo;shell&rdquo; provides ceramic structures with a matrix of boron nitride that provides long-term nonwetting behavior for molten nonferrous metals.

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Powell, TN, United States of America

Christopher W Ivey