Patent ID: 6171711
Filing Date: 2001-01-09
Classification: B23P,C23C,Y10T

Abstract:
An article preconditioned to accept a protective coating, the article comprised of a substrate material and having at least one fluid flow passage extending from an internal cavity to a substrate surface of the article, the passage having an axis, a throat with a regulatory flow area and a mouth extending from the throat to the substrate surface, the mouth having a nonregulatory flow area, the nonregulatory flow area being at least as large as the regulatory flow area, the passage having a newly installed state and a preconditioned state, the average rate of change of passage area from the throat to the substrate surface in the preconditioned state being greater than the average rate of change of passage area in the newly installed state and the regulatory flow area in the preconditioned state being substantially the same as the regulatory flow area in the newly installed state.