Method of making a ceramic core for casting an industrial gas turbine airfoil having a large airfoil pitch (10a) by forming a precursor core (chill) (10) 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.
申请公布号
WO0112361(A3)
申请公布日期
2001.08.30
申请号
WO2000US40218
申请日期
2000.06.15
申请人
HOWMET RESEARCH CORPORATION
发明人
KELLER, RONALD, J.;HAALAND, RODNEY, S.;FAISON, JULIE, A.