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High-temperature-resistant solder capable of being used for welding gamma-tial alloy and welding process thereof

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-strength and high-temperature solder brazing technology for high-strength and temperature-resistant joints, and achieve the effect of avoiding damage to the matrix structure and improving the diffusion capacity

Active Publication Date: 2019-10-22
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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  • High-temperature-resistant solder capable of being used for welding gamma-tial alloy and welding process thereof
  • High-temperature-resistant solder capable of being used for welding gamma-tial alloy and welding process thereof
  • High-temperature-resistant solder capable of being used for welding gamma-tial alloy and welding process thereof

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 tensile strength of the obtained TiAl alloy connection joint at room temperature 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...

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 tensile strength of the obtained TiAl alloy connection joint at room temperature 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 strength of the...

Embodiment 3

[0058] Select the composition of Ti-10Zr-15Cu-10Ni wt.% to prepare solder master alloy ingots and strips to obtain solder foils with a thickness of 0.05-0.055mm; 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 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 tensile strength of the joint at 700°C is 418MPa, which maintains 76.7% of the joint strength at room temp...

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Abstract

The invention relates to a high-temperature-resistant solder capable of being used for welding gamma-TiAl alloy and a welding process thereof, and belongs to the technical field of welding manufacturing. Due to the fact that the gamma-TiAl alloy with the light and temperature-resistant structures is small in the moveable slippage coefficient, the plasticity of the material is low, the processing performance is poor, and at present, aiming at high-temperature-resistant welding of the gamma-TiAl alloy, the high-temperature-resistant solder and the welding process are lack. According to the high-temperature-resistant solder and the welding process, the Tti-Zr-Cu-Ni solder with both strength and toughness is designed, the welding of the gamma-TiAl alloy can be realized at the temperature rangeof 930-950 DEG c, the room temperature tensile strength of the joint reaches more than 90% of the strength of the matrix, namely 510-545 Mpa, the tensile strength of the joint at the temperature of 700-760 DEG c can maintain 70-82% of the strength level of the room-temperature joint, namely in the range of 389-445 Mpa; the welding temperature is lower than the heat treatment temperature and phasechange point of the matrix material, and the structure and the performance of the welded metal are not obviously influenced.

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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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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