High-temperature solder for welding TiAl group alloy and preparation method thereof

Abstract

The invention discloses a high-temperature brazing filler metal used for TiAl-based alloy braze welding, and a preparation method thereof, relates to a brazing filler metal and a preparation method thereof, and solves the problems that the strength of a TiAl-based alloy braze welding joint is low in a high-temperature environment, the price of the brazing filler metal is high, the forms of adaptable joints are restricted, and the production process of the brazing filler metal is complicated. The brazing filler metal is made from TiH2, Ni, Si and C according to certain weight percentage by two steps, namely material preparation and mechanical alloying. For TiAl-based alloy, the melting point of the brazing filler metal is appropriate, the wetting property is good, the cost is low, the braze welding quality is good, the braze welding joint has good high-temperature mechanical properties, and the requirements of various types of joints are satisfied; moreover, the production process and equipment for the brazing filler metal are simple, and the production efficiency is high.

Description

technical field [0001] The invention relates to a brazing material and a preparation method thereof. Background technique [0002] TiAl-based alloys have a low density (about 3.8g / cm 3 ), high specific strength, good rigidity, and good high-temperature mechanical properties are considered to be an ideal new type of high-temperature-resistant material, and have broad application prospects in aviation, aerospace, automotive and other fields. However, the application of TiAl-based alloys in engineering to make components must involve welding problems, including its own welding and welding of other materials. Scholars at home and abroad have conducted relevant research on the welding of TiAl-based alloys. According to current literature and related reports, TiAl-based alloys have high melting points and high hardness. Their weldability shows that using brazing methods to join TiAl-based alloys is a more suitable method. [0003] But now also there are following problems in th...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low strength of TiAl-based alloy brazing joints under high temperature environment, high price of brazing materials used, limited applicable joint forms and complex preparation process of brazing materials, and proposes a method applicable to various forms. Joint requirements, low production cost, simple preparation process, good strength of brazed joints under high temperature environment, titanium-based powder filler metal for brazing TiAl-based alloys and its preparation method

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