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Method of preparing annular part from Ti2AlNb alloy and TiAl powder

A powder preparation and alloy powder technology, which is applied in the field of static pressure diffusion connection to prepare ring parts, to achieve the effects of expanding the scope of engineering applications, reliable connection, and simple structure

Active Publication Date: 2018-09-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Currently, for hot isostatic pressing diffusion bonding of TiAl powder and Ti 2 The method of preparing ring parts from AlNb alloy has not been reported yet

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  • Method of preparing annular part from Ti2AlNb alloy and TiAl powder
  • Method of preparing annular part from Ti2AlNb alloy and TiAl powder
  • Method of preparing annular part from Ti2AlNb alloy and TiAl powder

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Embodiment Construction

[0040] The present invention is a Ti 2 AlNb alloy and TiAl powder diffusion bonded annular piece preparation method.

[0041] The specific process is:

[0042] Step 1, prepare materials. Described preparation comprises the Ti of making 2 AlNb discs and prepared TiAl alloy powders.

[0043] According to the design requirements, Ti 2 AlNb alloy forging blank processed into Ti 2 AlNb alloy disk. The Ti 2 The outer surface of the AlNb alloy disc adopts positive tolerance, and the precision is 0~+0.01mm. to Ti 2 The outer surface of the AlNb alloy disk is polished to a surface roughness of less than 0.4.

[0044] The amount of the TiAl alloy powder includes Ti 2 The filling amount of TiAl alloy powder around the AlNb disk 7, and the filling amount in the hemisphere of the inner surface of the end cap of the upper sheath 1 and the filling amount of the hemisphere of the inner surface of the end cap of the lower sheath 2 in the sheath assembly. Both the TiAl alloy powder f...

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Abstract

The invention relates to a method of preparing an annular part from Ti2AlNb alloy and TiAl powder. Hot isostatic pressure diffusion bonding treatment on an alloy and powder is directly carried out, and forming of the powder and diffusion bonding of a special alloy are combined, so that a forming process is reduced, and the preparation cost is lowered. By adding an intermediate layer between the powder and the alloy, the method is simple in structure and good in manufacturability. A single reaction layer is obtained by directly diffusing elements between the powder and the alloy. Meanwhile, thehot isostatic pressure method can provide a uniform connecting stress distribution for obtaining a special alloy diffusion bonding annular part and reduces the stress concentration, so that the TiAlpowder and the Ti2AlNb alloy are reliably connected. The TiAl powder part is of a protruding semi-spherical design, so that amount of contraction of the TiAl powder in the hot isostatic pressure forming process is supplemented. A more precise annular structural part can be obtained, and the engineering application range of TiAl serial intermetallic compounds is expanded favorably.

Description

technical field [0001] The invention relates to the technical field of diffusion connection of dissimilar intermetallic compound rings, in particular to a TiAl powder and a TiAl powder 2 A method for preparing ring parts by hot isostatic pressing diffusion bonding of AlNb forgings. Background technique [0002] Due to the characteristics of low density, specific strength, high specific stiffness, high temperature oxidation resistance and excellent creep properties, TiAl intermetallic compounds are considered to be the most promising new lightweight structural materials to replace traditional superalloys. Compressors, aero engines, aerospace vehicles and other fields have broad application prospects. Among them, the service temperature of TiAl alloy can reach 700-900 ° C, Ti 2 AlNb alloys can be used at temperatures up to 650°C, although TiAl alloys are more 2 The use temperature of AlNb alloy is higher, but the plasticity of TiAl alloy is higher than that of TiAl alloy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08B22F3/15B22F5/10
CPCB22F3/15B22F5/106B22F7/08
Inventor 李金山朱雷唐斌张晓强寇宏超王军王毅高文强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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