A vacuum brazing method for a dissimilar high temperature alloy guide brazed assembly

By vacuum brazing a nickel-based cast high-temperature alloy guide to a deformed high-temperature alloy ring, combined with high-temperature long-time and low-temperature short-time heat treatment processes, and optimizing the brazed joint microstructure, the problem of insufficient brazed joint strength was solved, and a high-temperature resistant and reliable brazed joint was achieved.

CN122099464APending Publication Date: 2026-05-29HARBIN DONGAN ENGINE GRP
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Patent Information

Application Number
CN202610375291.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-25
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing vacuum brazing methods are not suitable for connecting nickel-based cast high-temperature alloy guides with deformed high-temperature alloy rings, resulting in insufficient brazed joint strength and easy occurrence of weld seam melting and cracking.

Method used

Vacuum brazing was performed using high-temperature nickel-based brazing filler metal BNi71CrSi, followed by two different heat treatment processes: high-temperature long-time heat treatment and low-temperature short-time heat treatment. These processes optimized the brazed seam structure and eliminated thermal stress. The optimal heat treatment process was determined through fluorescence detection, metallographic detection, and mechanical property testing.

Benefits of technology

It improves the shear strength of brazed joints, solves the problem of brazing seam melting and cracking, enhances the strength and quality of brazed joints, and ensures reliability under high temperature conditions.

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Abstract

The embodiment of the application discloses a vacuum brazing method for a dissimilar high-temperature alloy guide brazing assembly, which comprises the following steps: assembling a guide made of dissimilar high-temperature alloy material to form a guide assembly; transferring the guide assembly into a vacuum furnace for vacuum brazing within a preset time; using high-temperature nickel-based filler metal BNi71CrSi in the vacuum brazing process to form a guide brazing assembly; after the vacuum brazing is completed, continuously performing two heat treatment processes in different ways on the guide brazing assembly within a preset time; respectively using fluorescence detection, metallographic detection and mechanical property detection to evaluate the brazing seam quality and brazing joint strength of the guide brazing assembly, and obtaining a high-temperature-resistant brazing joint with reliable performance. The application solves the existing vacuum brazing mode of the guide assembly, and the heat treatment process after the vacuum brazing is not matched, thereby leading to insufficient strength of the guide brazing joint and problems such as melting and cracking of the brazing seam.
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Citation Information

Patent Citations

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