Ti-Al intermetallic compound alloy transition liquid phase diffusion weld composite connection method

A technology of intermetallic compound and composite connection, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of brittle structure, crack and low plasticity

Inactive Publication Date: 2006-02-08
中国航天科技集团公司第一研究院第七〇三研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main problem of fusion welding is: the weld seam and the heat-affected zone (especially the area near the fusion line) are prone to brittle structures and even cracks. At the same time, non-vacuum fusion welding processes inevitably introduce interstitial elements (such as oxygen , nitrogen and hydrogen, etc.), this element generally has deleterious effects
[0014] All research data show that: so far Ti 3 The brazing and diffusion welding technology of Al-based alloys still has the following deficiencies: (1) The existing researches are all aimed at Ti with lower Nb content. 3 Al-based alloys are carried out, for high Nb content Ti with higher mechanical properties 3 There is a lack of research on Al-based alloys and dual-phase alloys dominated by O phase; (2) The room temperature strength of the joint is 548MPa, the high temperature strength is 485MPa (650°C), and the plasticity is lower than that of the base metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Ti 3 Al-based alloy TAC-1B is processed into Φ16×30mm round bar, the surface is treated with 3% HF, 10% HNO 3 Drying after cleaning with pickling solution,

[0027] The Ti-13Zr-21Cu-9Ni is smelted into an ingot according to the weight percentage, and prepared into an amorphous state or a rapidly solidified foil strip mainly composed of an amorphous state, cut into a form matching the joint, and cleaned with acetone.

[0028] Use the energy storage spot welding machine for spot welding positioning, clean the alloy foil and place it on the surface to be welded for spot welding positioning. The surface of the welding spot has no burrs and no lap joints. Press fast and pressurize about 0.4-1MPa, and put it into a vacuum furnace.

[0029] The connection process is to keep warm at 980°C for 30 minutes, then lower it to 900°C for 6 hours, and cool with the furnace. The vacuum degree during the heating process is not lower than 1×10 -2 MPa, the sample is processed into a sta...

Embodiment 2

[0032] Ti 3 Al-based alloy TAC-1B is processed into Φ16×30mm round bar, the surface is treated with 3% HF, 10% HNO 3 Drying after cleaning with pickling solution,

[0033] The Ti-23Cu-15Ni is smelted into an ingot according to the weight percentage, prepared into an amorphous state or a rapidly solidified foil strip mainly composed of an amorphous state, cut into a form matching the joint, and cleaned with acetone.

[0034] Use the energy storage spot welding machine for spot welding positioning, clean the alloy foil and place it on the surface to be welded for spot welding positioning. The surface of the welding spot has no burrs and no lap joints. Press fast and pressurize about 0.4-1MPa, and put it into a vacuum furnace.

[0035] The connection process is 980 ° C for 30 minutes, then lowered to 900 ° C for 3 hours, and cooled with the furnace, the vacuum degree during the heating process is not lower than 1 × 10 -2 MPa, the sample is processed into a standard tensile sam...

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Abstract

Disclosed is a Ti-Al intermetallic compound alloy transition liquid phase diffusion welding composite connection method, by welding the Ti3Al alloy with the method, the room temperature strength and the high-temperature strength of the joint can reach over 80% of the mother metal's strength, equal plasticity with the mother metal can be obtained under room temperature, the joint can achieve uniform structure similar to the mother metal.

Description

technical field [0001] The invention relates to a material connection method, in particular to a Ti-Al intermetallic compound alloy transition liquid phase diffusion welding composite connection method. Background technique [0002] Ti 3 Al intermetallic compound is a new type of metal-based superalloy, compared with ordinary titanium alloy, its density (3.8 ~ 4.2g / cm 3 ) is equivalent, and the use temperature is higher. The working temperature of ordinary titanium alloys is still limited to below 600 °C so far, Ti 3 The working temperature of Al intermetallic compound is 600-750 ℃, or even higher, and it also has the advantages of high-temperature specific strength, high specific modulus, high-temperature oxidation resistance and high-temperature creep, and can reduce weight by 40% compared with nickel-based superalloys. about. Therefore, it has developed rapidly in recent years, and has entered into engineering applications, and is widely used in the manufacture of str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/16B23K20/24B23K35/24
Inventor 宁立芹梁德彬李海刚毛建英
Owner 中国航天科技集团公司第一研究院第七〇三研究所
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