THERMAL CVD TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a thermal CVD treatment method for moving and stationary blades (hereinafter simply referred to as blade") having high temperature corrosion resistance and applied for a gas turbine or the like. SOLUTION: A recessed part 15 provided on the space between the base edge part 12 and blade root part 13 of a turbine blade 14 is held by the flange parts 17 of a masking tool 16 sagging from a top board 20 provided so as to cover the blade root part 13 and is made in close contact therewith, further the space part between the tool 16 and the blade root part 13 is filled with masking fine particles 21, and the whole of the blade root part 13 is covered with the masking fine particles 21, thus the intrusion of treating gas for CVD-Cr treatment is prevented.