A method for preparing a single crystal and oriented columnar crystal composite crystal blade

By combining directional solidification with the seed crystal method, the crystal orientation and grain width of the composite crystallization blades of single crystal and directional columnar crystal are controlled, which solves the problems of single orientation and uncontrollable secondary orientation in the existing methods, improves the blade performance and qualification rate, and reduces costs.

CN119426564BActive Publication Date: 2025-09-16AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Patent Information

Application Number
CN202411509093.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-28
Publication Date
2025-09-16
Estimated Expiration
2044-10-28

AI Technical Summary

Technical Problem

In the existing method of preparing single crystal and oriented columnar crystal composite blades, the single crystal part has a single orientation and the secondary orientation is uncontrollable. The crystal orientation, grain boundary direction and grain width vary greatly, resulting in unstable blade performance and low pass rate.

Method used

The directional solidification combined with seed crystal method is used to pre-place composite seed crystals in the mold shell to ensure that the crystal orientation, grain boundary direction and grain width of the single crystal and directional columnar crystal composite crystal blades are consistent. Precise growth is achieved by controlling parameters such as the pulling speed and cooling rate.

Benefits of technology

The performance and qualification rate of single crystal and oriented columnar crystal composite crystal blades are improved, the manufacturing cost is reduced, and the needs of different application scenarios are met.

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Abstract

The present invention relates to a single crystal and oriented columnar crystal composite crystal blade and a preparation method thereof, belonging to the field of precision casting. The invention solves at least one of the problems existing in single crystal and oriented columnar crystal composite blades obtained by existing preparation methods, namely, the single crystal portion has a single orientation that cannot be controlled, the secondary orientation of the single crystal portion is uncontrollable, and the crystal orientation, grain boundary direction, and grain width vary greatly. The preparation method of the single crystal and oriented columnar crystal composite crystal blade comprises: S1, preparing a composite seed crystal; S2, preparing a mold shell; S3, placing the composite seed crystal in a seed crystal cavity of the mold shell; and preparing a single crystal and oriented columnar crystal composite crystal blade through directional solidification. The present invention realizes that the orientation of the single crystal portion in the single crystal and oriented columnar crystal composite blade can be controlled, no longer limited to [001] oriented grains, effectively controls the secondary orientation, and can more accurately control the crystal orientation, grain boundary direction, and grain width in the composite blade.
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