Titanium-zirconium-ferrum based solder for TiAl or Ti3Al alloy soldering

Abstract

The invention discloses a titanium-zirconium-ferrum based solder for TiAl or Ti3Al alloy soldering, which comprises chemical compositions in percent by weight: 20.0-30.0% of Zr, 13.0-20.0% of Fe and the balance of Ti or 20.0-30.0% of Zr, 7.0-12.9% of Fe, 2.0-8.0% of Cu, 2.0-6.0% of Ni and the balance of Ti. TiAl / TiAl and Ti3Al / Ti3Al alloy joints are obtained by using the solder at soldering temperature of between 1,030 and 1,070 DEG C, the shearing strength of a corresponding soldered joint at room temperature reaches 300 to 380MPa, the shearing strength of a soldered TiAl alloy joint at 760 DEG C reaches 210 to 250MPa, and the shearing strength of a Ti3Al alloy joint at 650 DEG C reaches 330 to 370MPa. The solder is suitable for self-connection of TiAl alloy or Ti3Al alloy.

Description

technical field [0001] The present invention is a kind of for TiAl or Ti 3 The invention relates to a titanium-zirconium-iron-based solder for Al alloy brazing, which belongs to the technical field of welding. Background technique [0002] Ti-Al based alloys (TiAl or Ti 3 Al) has low density, high specific strength, good high temperature oxidation resistance and creep resistance, and is a very promising lightweight high temperature resistant structural material. [0003] Due to the comprehensive performance advantages of Ti-Al-based alloys, it has good application prospects in aviation, aerospace, automobiles and other fields. In the late 1990s, foreign countries carried out research on the connection technology of Ti-Al-based alloys and obtained a series of results. However, the engineering application of Ti-Al-based alloys must involve welding problems. [0004] Brazing is a method suitable for joining Ti-Al based alloys. At present, most of the research on Ti-Al-base...

AI Technical Summary

Problems solved by technology

At present, most of the research on Ti-Al-based alloy brazing at home and abroad uses Al-based, Ti-based or Ag-based solders. For Ti-based solders, the shear strength of brazed joints at room temperature reaches 322MPa (S.J.Lee, S.K.Wu. Infrared joiningstrength and interfacial microstructures of Ti-48Al-2Nb-2Cr intermetallicsusing Ti-15Cu-15Ni foil.Intermetallics, 1999,7:11-21), for AgCu eutectic solder, the brazing joint shear strength reaches 345MPa (R.K.Shiue , S.K.Wu,S.Y.Chen.Infrared brazing of TiAl intermetallic using Bag-8braze alloy.ActaMaterialia,2003,51:1991-2004), but due to the limitation of the melting temperature of the solder, the heat resistance temperature of the brazing joint is significantly lower than that of TiAl The working temperature that the material itself can withstand, and the research on high-temperature brazing materials suitable for Ti-Al-based alloy brazing are still rarely reported.

However, the use of nickel-based high-temperature solder can easily generate brittle intermetallic compounds in the joint, which seriously reduces the mechanical properties of the joint.

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