CPC F01D 5/288 (2013.01) [C23C 2/04 (2013.01); C23C 10/08 (2013.01); C23C 10/24 (2013.01); C23C 16/045 (2013.01); C23C 16/06 (2013.01); C23C 28/021 (2013.01); F01D 5/187 (2013.01); F05D 2220/32 (2013.01); F05D 2230/90 (2013.01); F05D 2300/132 (2013.01); F05D 2300/611 (2013.01)] | 8 Claims |
1. A method of coating a turbine blade having an array of internal passageways that extend from a root to an airfoil, the method comprising:
aluminizing the array of internal passageways within the turbine blade; and
chromizing a portion of the array of internal passageways after aluminizing the array of internal passageways only up to a demarcation located at 20%-30% of an airfoil span of the turbine blade from the root such that an outer layer inboard of the demarcation of the array of internal passageways is converted to either Cr-rich gamma-Ni solid solution or gamma+alpha-Cr upon chromizing such that an aluminized section outboard of the demarcation and a chromized section inboard of the demarcation are about equal in thickness.
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