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

Abstract

The invention relates to high-temperature brazing filler metal and a preparation method and brazing technology of the high-temperature brazing filler metal, in particular to high-temperature Ti-based brazing filler metal for brazing of a TiAl-based alloy and a preparation method and brazing technology of the high-temperature Ti-based brazing filler metal. The problems that in existing brazing filler metal, postwelding connector mechanical performance and high-temperature performance are poor, the brazing filler metal melting point is low, and brazing filler metal preparation and the brazing technology are complex are solved. The brazing filler metal is prepared from, by weight percent, 10%-30% of Fe, 10%-30% of Mn, 0-5% of one or two or more kinds of Al, B, Co, Cr, Mg, Ag, Nb and Zn and the balance Ti. The preparation method comprises the steps that firstly, raw materials are weighed; secondly, the raw materials are contained in smelting equipment to be vacuumized, argon filling is carried out, then smelting is carried out many times, and cooling is carried out; and thirdly, a mother alloy obtained after smelting is subjected to quick cooling and melt-spinning, and the brazing filler metal is obtained. A quickly-cooled brazing filler metal foil band is subjected to brazing according to the brazing technology with the temperature ranging from 1,100 DEG C to 1,250 DEG C and the time ranging from 0 min to 120 min. Compared with existing brazing filler metal, the prepared brazing filler metal has the high melting point and excellent wettability and mechanical performance; and brazing filler metal preparation and the brazing technology are simple.

Description

Technical field: [0001] The invention relates to a high-temperature Ti-based brazing filler metal for TiAl-based alloys, a preparation method and a brazing process thereof, and specifically relates to a high-temperature Ti-based brazing filler metal for TiAl-based alloys and a preparation method for high-temperature Ti-based brazing filler metals for TiAl-based alloys. And the brazing process of high-temperature Ti-based solder for TiAl-based alloys. 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 de...

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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 environment, 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-based solder and its preparation method and brazing process

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