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:
Dec. 28, 1993
Filed:
Jun. 23, 1992
William R Freeman, Easton, CT (US);
Howmet Corporation, Greenwich, CT (US);
Abstract
In making a dual alloy gas turbine rotor, a plurality of superalloy components are formed to include an airfoil having a directionally solidified columnar grain structure or a single crystal grain structure. A boron-bearing melting point depressant material is applied to the inner surface and a side surface of the components. The components are arranged side-by-side in an annular array with the first side surface of one component juxtaposed to the second side surface of an adjacent component and with the inner surfaces defining a spray-receiving surface. The airfoils extend in a radial axis or direction of the array while the spray-receiving surface extends in a circumferential direction of the article. A sealing member is positioned adjacent an axial end of the array of the components to close off that end and form a spray-receiving cavity. Boron-bearing melting point depressant material is provided between the sealing member and the end of the array. The array/sealing member is heated to form an exposed liquid layer on the spray-receiving surface at the onset of plasma spraying of a molten metal and also to form a fusion joint between the juxtaposed first and second surfaces of the components and between the sealing member and the end of the array. A superalloy hub material is plasma sprayed onto the exposed liquid layer to buildup up a deposit in the cavity that forms a hub precursor of the rotor. The array/deposit is hot isostatically pressed using pressurized gas and then heated treated to develop desired properties in the components and the hub precursor.