Multi-element boron-free high-temperature brazing filler metal and sealing application method

By using boron-free high-temperature brazing filler metal and a tapered filler block design, the matching problem between brazing and solution treatment was solved, improving the welding stability and bonding strength of hollow blades, simplifying the sealing process, and ensuring the overall performance of the blades.

CN116493802BActive Publication Date: 2026-06-26DONGFANG TURBINE CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGFANG TURBINE CO LTD
Filing Date
2022-12-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing brazing processes suffer from problems such as mismatch between brazing temperature and solution treatment, degradation of microstructure and properties, crack defects, limited bonding strength, and high precision of assembly gaps, which particularly affect blade performance during the sealing and welding of hollow blades.

Method used

Boron-free high-temperature solder containing specific proportions of elements such as Al, Ti, Cr, Co, Nb, Mo, Ta, W, Zr, and La is used. Powder is prepared through vacuum melting and atomization, combined with a conical filler block design, and vacuum sintering and liquid-phase sintering are performed to simplify the sealing process and reduce assembly gap requirements.

Benefits of technology

It improves the stability and microstructure uniformity of welding materials, avoids the formation of harmful phases, enhances bonding strength, simplifies the process, and meets the overall performance requirements of the blade.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116493802B_ABST
    Figure CN116493802B_ABST
Patent Text Reader

Abstract

The application designs a kind of multi-element boron-free high-temperature brazing filler metal, and the chemical composition is as follows in percentage by weight: 5.5-7.5 of Al, 5.0-7.0 of Ti, 12.0-16.0 of Cr, 4.0-8.0 of Co, 4.0-7.0 of Nb, 2.0-6.0 of Mo, 7.0-10.0 of Ta, 0.05-0.1 of W, 0.01-0.03 of B, 0.07-0.2 of Zr, 0.001-0.004 of La, and the balance of Ni.A kind of high-temperature brazing filler metal for nickel-based superalloy is introduced, a reliable powder metallurgy sealing and welding process hole method is developed, the method is used to replace boron-containing brazing filler metal, the requirement precision of assembly gap is reduced, and the mismatching between sealing and welding process and solid solution treatment process is solved.Compared with traditional brazing, the welding area and affected area are more stable, the microstructure is excellent, the formation of harmful phase is reduced or avoided, the performance degradation of the matrix is not caused in subsequent treatment, and the overall performance requirements or desired performance characteristics of the blade are met.
Need to check novelty before this filing date? Find Prior Art