Design, Fabrication, and Evaluation of Gatorized(TM) Ceramic-Wrought Alloy Attachment Concepts.
Status rept. no. 6, 1 Jul 74-31 Dec 75,
PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FLA FLORIDA RESEARCH AND DEVELOPMENT CENTER
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Pratt and Whitney Aircraft P and WA has devised an attachment approach using P and WAs GATORIZINGTM forging process which uses the superplastic characteristics, induced during the GATORIZING process, on selected nickel base superalloys to forge a disk around a ceramic blade root. With this attachment approach, localized stress concentrations on the ceramic are minimized by the low flow stress during forging, inherent in the GATORIZING process. The program was devised to develop and demonstrate the feasibility of a small gas turbine engine hybrid rotor with a superalloy disk and ceramic simulated blades, using the aforementioned attachment concept. The first task was to conduct a design study of selected candidate attachment concepts. Primary candidates were then reduced to practice on a sample basis to establish optimum fabrication techniques, process parameters, ceramic stability during fabrication, and the load carrying capability of the attachment. Attachment concepts were evaluated in an iterative manner until one GATORIZEDTM ceramic-wrought superalloy attachment was successfully fabricated and demonstrated an ability to carry acceptable tensile loads.
- Ceramics, Refractories and Glass
- Fabrication Metallurgy
- Couplers, Fasteners and Joints
- Jet and Gas Turbine Engines