A kind of high-temperature Ti-ZR-based brazing alloy special for Tial-based alloys and its preparation method and brazing process

Abstract

The invention relates to a high-temperature brazing filler as well as a preparation method and a brazing process thereof, in particular to a high-temperature Ti-Zr-based brazing filler for a TiAl-based alloy as well as a preparation method and a brazing process of the high-temperature Ti-Zr-based brazing filler, and solves the problems that after a conventional brazing filler is adopted for brazing, the joint mechanical properties and the high-temperature properties are poor, the brazing filler melting point is low, as well as the brazing filler preparation process and the brazing process are complex. The high-temperature brazing filler provided by the invention comprises the following raw materials in percentage by weight: 10.0-40.0% of Zr, 10-30% of Fe, 10-30% of Mn, 0-5% of one or more of Al, B, Co, Cr, Mg, Ag, Nb and Zn, and the balance of Ti. The preparation method comprises the following steps: 1, weighing raw materials; 2, loading melting equipment with the raw materials, carrying out vacuum pumping, injecting argon gas, carrying out melting for several times, and cooling; and 3, subjecting a mother alloy obtained after the melting to quenching and melt spinning, so as to obtain the high-temperature brazing filler. Then, a brazing filler foil obtained after the quenching is adopted for brazing according to the brazing process of which the temperature and the cycle reach 1100-1250 DEG C and 0-120 min correspondingly. Compared with the conventional brazing filler, the prepared high-temperature brazing filler has the advantages that the melting point is high, the wettability is high, the mechanical properties are excellent, as well as the brazing filler preparation process and the brazing process are simple.

Description

Technical field: [0001] The invention relates to a high-temperature Ti-Zr-based solder for TiAl-based alloys, a preparation method and a brazing process thereof, and specifically relates to high-temperature Ti-Zr-based solders for TiAl-based alloys and high-temperature Ti-Zr for TiAl-based alloys. The preparation method of the base solder and the brazing process of the high-temperature Ti-Zr base solder special for TiAl base alloy. Background technique: [0002] In recent years, with the continuous development of science and technology, people have higher and higher requirements for the performance of aero-engines. Among them, the most important performance indicators in the engine are the thermal efficiency and thrust-to-weight ratio of the engine, and the simplest and most effective way to improve these two performance indicators is to use new lightweight, high-temperature-resistant materials to replace traditional nickel-based superalloys. In recent decades, TiAl-based a...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of low strength of TiAl-based alloy brazed joints, low use temperature of materials after brazing, poor joint performance in high-temperature environments, complicated brazing material preparation process and brazing process, the purpose of the present invention is to provide a wettability Good, high joint strength, high diffusion degree, high temperature after welding, and effectively reduce the brittle intermetallic compound phase at the joint TiAl-based alloy special high-temperature Ti-Zr-based solder and its preparation method and brazing process

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