Christopher R Ivey

US Patent:

6576330, Jun 10, 2003

Filed:

Jul 28, 2000

Appl. No.:

09/627944

Inventors:

Steven R. Schenck - Brighton MI
Karl W. Dersch - Okemos MI
Lloyd R. Chapman - Knoxville TN
William B. Webb - Oak Ridge TN
Christopher W. Ivey - Powell TN

Assignee:

Rex Roto Technologies, Inc. - Fowlerville MI
Zyp Coatings, Inc. - Oak Ridge TN

International Classification:

B32B 1800

US Classification:

4282934, 428325, 428332, 428364, 428401

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 âshellâ 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 âshellâ layer uniformity. Boron nitride content of greater than 36 wt. % (or about 50 vol. %) in the boron nitride âshellâ provides ceramic structures with a matrix of boron nitride that provides long-term nonwetting behavior for molten nonferrous metals.