Diffusion connection method for TiAl alloy and Ti2AlNb alloy

Abstract

The invention discloses a diffusion connection method for a TiAl alloy and a Ti2AlNb alloy. By controlling diffusion connection process parameters and carrying out furnace pressure and temperature keeping treatment, reliable connection between dissimilar intermetallic compounds is achieved, and a certain basis and support is provided for the study and manufacturing of complex structural components. According to the diffusion connection method, by controlling three variable parameters of the diffusion connection temperature, the deformation amount and the time and carrying out furnace temperature keeping treatment, an interlayer is not added, reliable connection of the alloys is achieved through mutual reactions and diffusion of main elements of Ti, Al and Nb and other microelements, and application and popularization of the TiAl series intermetallic compounds are facilitated; and a TiAl alloy and Ti2AlNb alloy diffusion connection piece is used for aerospace light high-temperature structural components, the properties of the two kinds of materials can be effectively achieved, and great application prospects are achieved.

Description

technical field

[0001] The invention belongs to the field of TiAl intermetallic compound welding, and relates to a TiAl alloy and Ti 2 AlNb alloy diffusion bonding method. Background technique

[0002] With the development of modern aircraft and aviation technology, higher and higher requirements are put forward for the high temperature performance of materials. TiAl intermetallic compound is a new type of structural material that has been developed in recent years. It has the characteristics of both metal and ceramics, with high melting point, high temperature strength, high elastic modulus, low density, strong oxidation resistance and flame retardancy. It is mainly used in the aerospace and automotive fields, such as engine high-pressure compressors, low-pressure turbochargers, nozzles, exhaust valves and other components. It is considered to be one of the most promising high-temperature and lightweight structural materials. one. In the process of its engineering applic...

Examples

Embodiment 1

[0030] The concrete process of this embodiment is:

[0031] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0032] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0033] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

Embodiment 2

[0038] The concrete process of this embodiment is:

[0039] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0040] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0041] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

Embodiment 3

[0046] The concrete process of this embodiment is:

[0047] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0048] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0049] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

technical field

[0001] The invention belongs to the field of TiAl intermetallic compound welding, and relates to a TiAl alloy and Ti 2 AlNb alloy diffusion bonding method. Background technique

[0002] With the development of modern aircraft and aviation technology, higher and higher requirements are put forward for the high temperature performance of materials. TiAl intermetallic compound is a new type of structural material that has been developed in recent years. It has the characteristics of both metal and ceramics, with high melting point, high temperature strength, high elastic modulus, low density, strong oxidation resistance and flame retardancy. It is mainly used in the aerospace and automotive fields, such as engine high-pressure compressors, low-pressure turbochargers, nozzles, exhaust valves and other components. It is considered to be one of the most promising high-temperature and lightweight structural materials. one. In the process of its engineering applic...

Examples

Embodiment 1

[0030] The concrete process of this embodiment is:

[0031] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0032] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0033] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

Embodiment 2

[0038] The concrete process of this embodiment is:

[0039] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0040] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0041] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

Embodiment 3

[0046] The concrete process of this embodiment is:

[0047] Step 1: Cut the sample. TiAl alloy and Ti 2 AlNb alloys are processed by wire cutting respectively to obtain the TiAl alloy samples and TiAl alloy samples to be connected according to the design requirements. 2 AlNb alloy samples.

[0048] Step 2: Surface treatment. The resulting TiAl alloy to be joined and Ti 2 The connection surface of the AlNb alloy is finely ground by a grinding machine to eliminate obvious scratches on the surface to be connected, and then mechanically polished with 1.5# diamond grinding and polishing paste to make the surface to be connected show a mirror effect, and then the sample is immersed in absolute ethanol and ultrasonically Degreasing treatment for 5 minutes, and placed in absolute ethanol for storage.

[0049] Step 3: Make the assembly parts. Apply solder stopper to the part of the fixture close to the edge of the welded sample. Put the TiAl alloy in the jig, and then put the Ti...

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