Method of restoring the shrouds of turbine blades

Details Method of restoring the shrouds of turbine blades Method of restoring the shrouds of turbine blades

B - Operations, Transporting

23

P

117/53, 117/7

B23P 6/00 (2006.01) B05D 1/08 (2006.01) F01D 5/00 (2006.01)

Patent

CA 1119896

Abstract method of restoring the shroud of a turbine blade which has become worn, and particularly that edge of the snroud in the vicinity of what is commonly known as the Z-notch, which comprises the steps of grinding down the shroud in the vicinity of said notch to an accurately pre- determined dimension with respect to the original geometry of the shroud, placing the blade in a fixture having a masking member with a slot in it, such that the Z-notch of the blade is disposed substantially in alignment with the slot, and de- positing, by means of a plasma spray, a metal alloy onto the edge in an amount just sufficient to build up the same essen- tially to its original dimension. Following the plasma spraying, the built-up edge is sintered at a temperature on the order o_ 1900° F or more, to more firmly bond the built-up layer to the base metal. The blade is then cooled. The advantage of the present method is that it is especially inexpensive to carry out, while at the same time providing a re- furbished component which meets the stringent dimensional and physical specifications for a new part. Moreover, since the resulting edge conforms so closely to the original geometry of a new blade, no additional refinishing or grinding operations are normally required after the sintering.

317593

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