Ceramic core and method of making
AssigneeHowmet Research Corporation
InventorsRonald J. Keller, Rodney S. Haaland, Julie A. Faison
Life of this patent
Estimating the term…
Abstract
Method of making a ceramic core for casting an industrial gas turbine engine airfoil having a large airfoil pitch by forming a precursor core (chill) of smaller dimensions than the final desired ceramic core, firing the chill, applying a thin ceramic skin to the fired chill to form a coated core of final dimensions, and then firing the coated core. Firing of the thin ceramic skin reduces airfoil pitch shrinkage resulting from the latter firing operation to reduce overall core dimensional tolerance variations.
Claims2
A ceramic core for making a gas turbine engine airfoil casting, comprising a fired chill having an airfoil section and smaller dimensions than that of said ceramic core and a thin ceramic skin on the fired chill to form a coated core having increased dimensions corresponding substantially to those desired for said ceramic core, said coated core having an airfoil pitch of one inch and greater and an airfoil pitch shrinkage of about 0.5% or less.
Dependencies are inferred from the claim text.