Ceramic core preparation method for controlling recrystallization of inner cavity of single crystal hollow blade

By performing two injections in succession, a ceramic core with good yield and sufficient strength was prepared, which solved the problem of recrystallization of the inner cavity of the single crystal hollow blade after the ceramic core was cast at high temperature, and improved the efficiency of the single crystal. Casting pass rate of hollow blades.

CN119057013BActive Publication Date: 2025-01-24AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Patent Information

Application Number
CN202411562453.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-05
Publication Date
2025-01-24
Estimated Expiration
2044-11-05

AI Technical Summary

Technical Problem

The prior art is difficult to complete the complete filling of the ceramic core by one hot pressing molding, resulting in the filling of the thin-wall position being unsatisfied and impermeable, and the thick-wall position is prone to dimensional shrinkage and deformation, and the ceramic core is single after casting at high temperature. The inner cavity of the hollow crystal blade produces recrystallization.

Method used

Adopt two ways to perform two injections, first use the cold core mold for a charging suppression, obtain an integrated cold core, and then form a tenon -and -mortise stitching cold core by cutting and tenon -and -mortise stitching. Finally, the ceramic core mold is charged and suppressed to prepare a ceramic core with good concessions and sufficient strength.

Benefits of technology

It is realized that the ceramic core will not recrystallize the inner cavity of the single crystal hollow blade after high-temperature casting, while ensuring the dimensional accuracy and performance of the ceramic core, and improving the casting pass rate of the single crystal hollow blade.

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Abstract

The invention discloses a method for preparing a ceramic core for controlling the recrystallization of the inner cavity of a single crystal hollow blade, comprising the following steps: injecting a ceramic core slurry into a cold core mold for a primary filling and pressing to obtain an integrated cold core; cutting off a portion of the cold core from the integrated cold core, and placing the remaining portion of the cold core into the cold core mold at a position corresponding to its structure; injecting a hot melt core slurry into the cold core mold for a secondary filling and pressing to obtain a mortise and tenon joint cold core; placing the mortise and tenon joint cold core into a ceramic core mold, and injecting the ceramic core slurry into the ceramic core mold for filling and pressing to obtain a ceramic core blank; calcining the ceramic core blank to obtain a ceramic core for controlling the recrystallization of the inner cavity of a single crystal hollow blade. The ceramic core prepared by the invention has sufficient strength and good yield, and solves the problem that the inner cavity of a single crystal hollow blade is prone to recrystallization after high-temperature casting.
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Citation Information

Patent Citations

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