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Composite connecting method with transition liquid phase diffusion welding of intermetallic Ti-Al compound alloy

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, harmfulness, low plasticity, etc.

Active Publication Date: 2008-11-19
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

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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

[0029] Ti 3 Al-based alloy TAC-1B is processed into Φ16×30mm round bar, the surface is treated with 3%HF, 10%HNO 3 The pickling solution is cleaned and then dried,

[0030] The Ti-13Zr-21Cu-9Ni is smelted into ingots by weight percentage, prepared into amorphous or fast-solidified foil strips with amorphous structure, cut into a form matching the joint, and cleaned with acetone.

[0031] Use the energy storage spot welding machine for spot welding positioning, clean the alloy foil strip and place it on the spot welding surface to be welded. Press quickly and pressurize about 0.4-1MPa, and put it into a vacuum furnace.

[0032] The connection process is to keep at 940℃ for 30min, then drop to 900℃ for 3h, cool with the furnace, and the vacuum degree during the heating process is not less than 1×10 -2 MPa, the specimens were processed into standard tensile specimens after welding. The joint strength using the above connection process is shown in Table 1 (where σ b is the te...

Embodiment 2

[0037] Ti 3 Al-based alloy TAC-1B is processed into Φ16×30mm round bar, the surface is treated with 3%HF, 10%HNO 3 The pickling solution is cleaned and then dried,

[0038] The Ti--23Cu-15Ni is smelted into ingots by weight percentage, prepared into amorphous or fast-solidified foil strips dominated by amorphous structure, cut into a form matching the joint, and cleaned with acetone.

[0039] Use the energy storage spot welding machine for spot welding positioning, clean the alloy foil strip and place it on the spot welding surface to be welded. Press quickly and pressurize about 0.4-1MPa, and put it into a vacuum furnace.

[0040] The connection process is to keep at 1050 °C for 10 minutes, then drop to 900 °C for 3 hours, and cool with the furnace. During the heating process, the vacuum degree is not less than 1 × 10 -2 MPa, the specimens were processed into standard tensile specimens after welding. The joint strength using the above connection process is shown in Table ...

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Abstract

The present invention is composite connecting method through diffusion welding with transitional alloy liquid phase of intermetallic Ti-Al compound. When Ti3Al alloy parts are welded in the said method, the welded joint may have room temperature and high temperature strength up to 80 % of that of the mother material, room temperature plasticity the same as that of the mother material, and structure homogeneity near that of the mother material.

Description

technical field [0001] The invention relates to a connection method of materials, 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 / cm2) 3 ), and the operating temperature is higher. The working temperature of ordinary titanium alloys is still limited to below 600 ℃. 3 The working temperature of Al intermetallic compounds 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, etc. Compared with nickel-based superalloys, the weight can be reduced by 40%. about. Therefore, it has developed rapidly in recent years, and has entered into engineering applications, and is widely used in the manufacture of structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/16B23K20/24B23K35/24B23K35/32
Inventor 宁立芹梁德斌李海刚毛建英
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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