Diffusion welding method of TiAl/Nb based alloy and Ni based high-temperature alloy

A high-temperature alloy and diffusion welding technology, which is applied in the direction of welding/welding/cutting items, welding equipment, metal processing equipment, etc., can solve the problems of high cost, complicated process and high manufacturing cost

Inactive Publication Date: 2009-01-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method enables the joint to obtain a higher connection strength, the process is complicated and the manufacturing cost is high due to the need to use high-cost laser cladding technology to modify the surface of γ-TiAl before welding

Method used

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  • Diffusion welding method of TiAl/Nb based alloy and Ni based high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Diffusion welding of TiAl / Nb alloy TiAl and Ni-based superalloy GH710.

[0017] Take a Nb foil with a thickness of 10 μm and a purity of 99.9wt.% and a Ni foil with a thickness of 10 μm and a purity of 99.9wt.%, put them in acetone, clean them ultrasonically for 10 seconds, and dry them in air. Use 1500 # SiC sandpaper is used to grind the surface of TiAl alloy and GH710 superalloy to be welded so that the surface roughness Ra value is less than 1.6. Then put the TiAl alloy and GH710 superalloy into acetone solution, ultrasonically clean them for 5 minutes, and dry them in air. The above-mentioned materials are clamped: the intermediate layer 3 composed of Nb foil 2 and Ni foil 6 is placed between the TiAl / Nb alloy 5-TiAl and the Ni-based superalloy 7-GH710, wherein the Nb foil 2 is in contact with TiAl, Ni foil 6 is in contact with GH710 to build the workpiece to be welded. Put the workpiece to be welded into a vacuum furnace, and place it between the upp...

Embodiment 2

[0019] Example 2: TiAl / Nb alloy Ti 3 Diffusion welding of Al and Ni-based superalloy GH4133.

[0020] Take a Nb foil with a thickness of 15 μm and a purity of 99.9wt.% and a Ni foil with a thickness of 15 μm and a purity of 99.9wt.%, put them in acetone, clean them ultrasonically for 15 seconds, and dry them in air. Use 1500 # SiC sandpaper on Ti 3 The surface of Al alloy and GH710 superalloy to be welded is ground to make the surface roughness Ra value less than 1.6. Then Ti 3 Al alloy and GH710 superalloy were put into acetone solution, ultrasonically cleaned for 7 minutes, and dried in air. Install the above materials: place the intermediate layer 3 composed of Nb foil 2 and Ni foil 6 on TiAl / Nb alloy 5-Ti 3 Between Al and Ni-based superalloy 7-GH710, where Nb foil 2 and Ti 3 Al contact, Ni foil 6 and GH710 contact, construct the workpiece to be welded. Put the workpiece to be welded into the vacuum furnace, and place it between the upper pressure head 4 and the lowe...

Embodiment 3

[0022] Example 3: TiAl / Nb alloy Ti 2 Diffusion welding of AlNb and Ni-based superalloy GH4169.

[0023] Take a Nb foil with a thickness of 20 μm and a purity of 99.9wt.% and a Ni foil with a thickness of 15 μm and a purity of 99.9wt.%, put them in acetone, clean them ultrasonically for 15 seconds, and dry them in air. Use 1500 # SiC sandpaper on Ti 3 The surface of Al alloy and GH710 superalloy to be welded is ground to make the surface roughness Ra value less than 1.6. Then Ti 3 Al alloy and GH710 superalloy were put into acetone solution, ultrasonically cleaned for 9 minutes, and dried in air. Install the above materials: place the intermediate layer 3 composed of Nb foil 2 and Ni foil 6 on TiAl / Nb alloy 5-Ti 3 Between Al and Ni-based superalloy 7-GH710, where Nb foil 2 and Ti 3 Al contact, Ni foil 6 and GH710 contact, construct the workpiece to be welded. Put the workpiece to be welded into the vacuum furnace, and place it between the upper pressure head 4 and the lo...

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Abstract

The invention discloses a dispersing welding method for a TiAl/Nb series alloy and a Ni-based high temperature alloy. First, a middle layer formed by overlapping a processed Nb foil with a Ni foil is arranged between the TiAl/Nb series alloy and the Ni-based high temperature alloy, the surfaces of which are processed; wherein, the Nb foil is contacted with the TiAl/Nb series alloy and the Ni foil is contacted with the Ni-based high temperature alloy to construct a welded workpiece; the welded workpiece is arranged between an upper squeeze head and a lower squeeze head in a vacuum dispersing welding boiler; a welding resistance layer is arranged between the upper squeeze head and the TiAl/Nb series alloy as well as between the lower squeeze head and the Ni-based high temperature alloy; the dispersing welding of the TiAl/Nb series alloy and the Ni-based high temperature alloy are finished in the vacuum dispersing welding boiler. Due to the dispersing welding method of adding a compound middle layer of Nb-Ni, no hard brittle phases are generated on a connection interface; the anti-tension intensity of a joint is improved from 183MPa art to 516-750MPa; the shearing intensity of the joint is improved from 359MPa to 372-528MPa.

Description

technical field [0001] The invention relates to a diffusion welding method of a TiAl / Nb series alloy and a Ni-based superalloy. Background technique [0002] TiAl, Ti 3 Al and Ti 2 AlNb-based alloys (hereinafter referred to as: TiAl / Nb-based alloys) have operating temperatures of 800-900°C, 600-700°C, and 650-750°C, and are widely used in the manufacturing of hot-end parts of aviation and aerospace vehicles. [0003] The document "The Influence of TiAl / 40Cr Steel Diffusion Bonding Interface Structure on Joint Strength, He Peng, Feng Jicai, Qian Yiyu. Materials Science and Technology, 2003, Volume 11, Issue 2" discloses a TiAl / 40Cr steel diffusion bonding method, The method adopts the diffusion welding method to realize the direct connection of TiAl and 40Cr steel, and because the joint does not contain low melting point materials, it can be applied under high temperature conditions. But the strength of the joint is low, the highest tensile strength is only 183MPa. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K103/18
Inventor 熊江涛张赋升李京龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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