The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1979
Filed:
Dec. 12, 1977
Salvatore J Cretella, North Haven, CT (US);
Matthew Bernardo, West Haven, CT (US);
Ralph T DeMusis, North Branford, CT (US);
Other;
Abstract
A method of restoring the shroud of a turbine blade which has become worn, and particularly that edge of the shroud 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 predetermined 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 depositing, by means of a plasma spray, a metal alloy onto the edge in an amount just sufficient to build up the same essentially to its original dimension. Following the plasma spraying, the built-up edge is sintered at a temperature on the order of 1900.degree. F. or more, to more firmly bond the built-up layer to the base metal. The blade is then cooled. The resulting edge conforms so closely to the original geometry of a new blade that no additional refinishing or grinding operations are normally required after the sintering.