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A kind of high temperature resistant solder that can be used for γ-tial alloy and brazing process

A brazing process and high-temperature-resistant technology, which is applied in the field of welding manufacturing, can solve the problems of lack of high-temperature solder brazing process for high-strength and temperature-resistant joints, and achieve the effect of wide application range and good joint performance

Active Publication Date: 2021-12-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, for the brazing of cast TiAl alloy itself, there is still a lack of high-temperature solder and suitable brazing process for high-strength and temperature-resistant joints

Method used

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  • A kind of high temperature resistant solder that can be used for γ-tial alloy and brazing process
  • A kind of high temperature resistant solder that can be used for γ-tial alloy and brazing process
  • A kind of high temperature resistant solder that can be used for γ-tial alloy and brazing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Select the composition of Ti-8Zr-10Cu-15Ni wt.% to prepare solder master alloy ingots and strips to obtain solder foils with a thickness of 0.028-0.030mm; position the foils on one side of the material to be welded by spot welding On the surface to be welded, the assembly of the materials to be connected on both sides is completed by positioning sheets or tooling. Using a vacuum brazing furnace, the welding temperature is 935°C, the holding time is 45min, and the vacuum degree is 10 -3 Pa~10 -5 Pa, welding gap 0.1mm; room temperature rises to 600°C corresponding to a heating rate of 85°C / min, from 600°C to 930-950°C corresponds to a heating rate of 120°C / min, and the cooling rate after heat preservation is 65°C / min min. The room temperature tensile strength of the obtained TiAl alloy connection joint is 520MPa, reaching 95.4% of the strength of the matrix material; the tensile strength of the joint at 700°C is 410MPa, maintaining 78.8% of the joint strength at room te...

Embodiment 2

[0056] Select the composition of Ti-9Zr-12Cu-14Ni wt.% to prepare solder master alloy ingots and strips to obtain solder foils with a thickness of 0.035-0.040mm; position the foils on one side of the material to be welded by spot welding On the surface to be welded, the assembly of the materials to be connected on both sides is completed by positioning sheets or tooling. Using a vacuum brazing furnace, the welding temperature is 940 ° C, the holding time is 50 minutes, and the vacuum degree is 10 -3 Pa~10 -5Pa, welding gap 0.07mm; room temperature rises to 600°C corresponding to a heating rate of 80°C / min, from 600°C to 930-950°C corresponds to a heating rate of 100°C / min, and the cooling rate after heat preservation is 70°C / min min. The room temperature tensile strength of the obtained TiAl alloy connection joint is 540MPa, reaching 99.0% of the strength of the matrix material; the tensile strength of the joint at 700°C is 445MPa, maintaining 82.4% of the joint strength at ...

Embodiment 3

[0058] Select the composition of Ti-10Zr-15Cu-10Ni wt.% to prepare solder master alloy ingot and carry out stripping to obtain solder foil with a thickness of 0.05-0.055mm; position the foil on one side of the material to be welded by spot welding On the surface to be welded, the assembly of the materials to be connected on both sides is completed by positioning sheets or tooling. Using a vacuum brazing furnace, the welding temperature is 950 ° C, the holding time is 30 minutes, and the vacuum degree is 10 -3 Pa~10 -5 Pa, welding gap 0.04mm; room temperature rises to 600°C corresponding to a heating rate of 90°C / min, from 600°C to 930-950°C corresponds to a heating rate of 110°C / min, and the cooling rate after heat preservation is 80°C / min min. The room temperature tensile strength of the obtained TiAl alloy connection joint is 545MPa, which is as strong as the base material; the joint tensile strength at 700°C is 418MPa, which maintains 76.7% of the room temperature joint s...

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Abstract

The invention relates to a high-temperature-resistant solder and a welding process that can be used for welding γ-TiAl alloys, and belongs to the technical field of welding manufacturing. Due to the fact that γ-TiAl alloy, a light-weight and temperature-resistant structural material, has few movable slip systems, low plasticity and poor processing performance, there is still a lack of suitable high-temperature-resistant solder for the high-temperature-resistant welding of γ-TiAl alloy itself. and welding process. The present invention designs Ti-Zr-Cu-Ni solder with both strength and toughness, which can realize the welding of γ-TiAl alloy in the temperature range of 930-950 ° C, and the tensile strength of the joint at room temperature reaches more than 90% of the matrix strength. That is, 510-545MPa, and the tensile strength of the joint at 700-760°C can maintain 70-82% of the joint strength level at room temperature, that is, reach 389-445MPa. The welding temperature is lower than the heat treatment temperature and phase transition point of the base material, and will not significantly affect the structure and performance of the welded metal itself.

Description

technical field [0001] The invention relates to a high-temperature-resistant solder and a brazing process that can be used for γ-TiAl alloys, and belongs to the technical field of welding and manufacturing. Background technique [0002] γ-TiAl alloy (hereinafter referred to as TiAl alloy) has high specific strength, specific modulus, good creep resistance and oxidation resistance, and is a light-weight high-temperature structural material with great potential. Replacing the currently used superalloys with TiAl alloys can greatly reduce the weight of engine parts and improve engine efficiency. Using TiAl alloy to make turbine engine blades can reduce the weight by 45%. The U.S. Air Force Materials Laboratory and GE have developed various typical parts of TiAl alloys. In recent years, domestic cast TiAl alloy turbines and blades have been tested and applied in automotive supercharged turbines and aero engines. For example, TiAl blades have passed the vibration fatigue test c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/32B23K1/008B23K103/14
CPCB23K35/325B23K1/008B23K35/0233B23K2103/14
Inventor 静永娟熊华平尚泳来
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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