Boron nitride paste composition, boron nitride "shell" coated ceramic structure, and process of manufacturing
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United States of America Patent
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Jun 10, 2003
Grant Date -
N/A
app pub date -
Jul 28, 2000
filing date -
Jul 28, 2000
priority date (Note) -
Expired
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Abstract
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 'shell' 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 3/32 inch improves boron nitride 'shell' layer uniformity. Boron nitride content of greater than 36 wt. % (or about 50 vol. %) in the boron nitride 'shell' provides ceramic structures with a matrix of boron nitride that provides long-term nonwetting behavior for molten nonferrous metals.
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