Diffusion welding method adopting Ti-Nb alloy as intermediate layer

An intermediate layer, diffusion welding technology, applied in the field of diffusion welding, can solve problems such as the influence of base metal structure and properties, high welding temperature, and no description of joint strength value, etc., and achieve the effect of good metallurgical compatibility.

Active Publication Date: 2022-03-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

Patent (CN106808079A) invented a diffusion bonded TiAl alloy and Ti 2 AlNb alloy method, this method does not use the intermediate layer, but directly carries out the diffusion welding of two materials, by controlling the welding temperature (930 ℃ ~ 1000 ℃), holding time (1h ~ 2h), the total deformation of the sample (2 %~5%) to achieve diffusion bonding, but did not explain the value of the joint strength obtained by this method
The patent (CN105798449A) introduces a method of diffusion bonding high-niobium TiAl alloys using a composite metal foil. The thickness of the Ti foil or Nb foil layer is 10μm~30μm, the welding temperature is 1100℃~1300℃, the holding time is 1h~3h, and the pressure is 15MPa~30MPa during welding. Due to the low diffusion rate of Nb atoms, the welding method used in this method Higher temperature and longer holding time may affect the structure and properties of the base metal
But at present domestic and foreign about TiAl alloy and Ti 2 AlNb alloy or Ti 3 The research reports on Al-based alloy heterogeneous connection are still very limited, and the strength of the joint needs to be further improved

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  • Diffusion welding method adopting Ti-Nb alloy as intermediate layer

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Embodiment 1

[0028] In the present embodiment, adopt the method of the present invention to TiAl alloy and Ti 2 The steps of AlNb diffusion welding connection are as follows:

[0029] Step 1. Design Ti-5Nb (wt.%) alloy, and prepare alloy ingot by vacuum arc melting method, and then prepare Ti-Nb alloy foil by rolling process;

[0030] Step 2, the TiAl alloy and Ti 2 The AlNb alloy is processed into the required size to obtain the base metal to be welded;

[0031] Step 3, after polishing the surface to be welded of the base material to be welded with sandpaper, perform polishing treatment, put the polished base material to be welded and Ti-Nb alloy foil with a thickness of 20 μm into acetone and ultrasonically clean it for 10 minutes;

[0032] Step 4. Place the Ti-Nb alloy foil on the surface of the alloy to be welded, put the workpiece to be welded in the diffusion welding equipment, and apply a pressure of 15MPa. When the vacuum degree of the equipment reaches 9×10 -2 Then start heatin...

Embodiment 2

[0034] The difference between this embodiment and the first embodiment is that the TiAl alloy and Ti 3 For the diffusion welding connection between Al-based alloys, the composition of the Ti-Nb alloy described in step 1 is Ti-8Nb (wt.%). Others are the same as in Embodiment 1.

Embodiment 3

[0036] The difference between this embodiment and the first embodiment is that the melting method adopted in the first step is vacuum induction melting, the thickness of the Ti-Nb alloy foil mentioned in the third step is 15 μm, and the welding temperature is 900° C. Others are the same as in Embodiment 1.

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Abstract

The invention relates to a diffusion welding method adopting Ti-Nb alloy as a middle layer, which comprises the following steps of: preparing the Ti-Nb alloy middle layer on a to-be-welded surface of a welded base material, putting the Ti-Nb alloy middle layer into diffusion welding equipment, applying pressure, and completing welding after heating, heat preservation and cooling thermal cycle. According to the method, appropriate Ti-Nb alloy intermediate layer components and thickness are provided, welding parameters are regulated and controlled, good control over the diffusion bonding process can be achieved, and a weld joint structure close to two welded base materials is obtained. The tensile strength of the obtained dissimilar joint of the TiAl alloy and the Ti2AlNb alloy or the Ti3Al-based alloy at the room temperature and the high temperature of 650 DEG C reaches 80%-90% of that of the TiAl alloy.

Description

technical field [0001] The invention relates to a diffusion welding method using Ti-Nb alloy as an intermediate layer, which belongs to the technical field of welding. Background technique [0002] Titanium-aluminum intermetallic compounds have the advantages of low density, high specific strength and specific stiffness, good oxidation resistance, good creep resistance and fatigue resistance, and are one of the most promising lightweight high-temperature structural materials for aerospace. Among titanium-aluminum intermetallic compounds, TiAl alloys, Ti 2 AlNb alloy or Ti 3 The research on Al-based alloys has been paid attention to, and the working temperature of TiAl alloys can reach 760°C to 850°C. 2 AlNb alloy or Ti 3 The working temperature of Al-based alloys can reach 700°C. Compared with ordinary titanium alloys, TiAl alloys, Ti 2 AlNb alloy or Ti 3 Al-based alloys can serve at higher temperatures; compared with superalloys, they have lower density, which is abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K20/02B23K20/26B08B3/08B08B3/12B23K103/10B23K103/14
CPCB23P15/00B23K20/026B23K20/26B08B3/08B08B3/12B23K2103/10B23K2103/14
Inventor 任海水熊华平冯洪亮尚泳来程耀永
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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