Contact reaction brazing connection method for TiAl based alloy and Ni based high-temperature alloy

A high-temperature alloy and contact reaction technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of silver brazing joints that are not resistant to high temperature, high requirements on the surface of the weldment to be welded, and long connection thermal cycle period. , to achieve the effect of good joint performance, high production efficiency and reduced welding cost

Active Publication Date: 2012-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The present invention aims to solve the problems of complex process, high cost, long connection thermal cycle, low efficiency, high requirements on the surface of the weldment to be welded, and the joints of silver brazing in the existing method for welding TiAl-based alloys and Ni-based superalloys by diffusion bonding. High temperature resistance and the brittle phase of high temperature brazing are easy to generate aggregation and growth problems, and provide a contact reaction brazing connection method between TiAl-based alloys and Ni-based superalloys

Method used

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  • Contact reaction brazing connection method for TiAl based alloy and Ni based high-temperature alloy
  • Contact reaction brazing connection method for TiAl based alloy and Ni based high-temperature alloy

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specific Embodiment approach 1

[0012] Specific embodiment 1: The contact reaction brazing connection method of the TiAl-based alloy and the Ni-based superalloy of this embodiment is carried out in the following steps: 1. The surface to be welded of the Ti foil, TiAl-based alloy and Ni-based superalloy is processed 2. Place the Ti foil between the TiAl-based alloy and the Ni-based high-temperature alloy to form the part to be welded; 3. Place the part to be welded in a vacuum brazing furnace and fix it with a pre-pressure of 0.001 MPa to 0.01 MPa, Then the vacuum degree is 1.0×10 -3 Pa~7.0×10 -3 Under the condition of Pa, heat up to 790℃~810℃ at a rate of 5℃ / min~20℃ / min, keep it for 8min~12min, then continue heating to 960℃~ at a rate of 5℃ / min~20℃ / min Keep the temperature at 1040℃ for 1min~30min, then cool to 300℃~500℃ at a rate of 5℃ / min~20℃ / min, then cool to room temperature with the furnace to complete the connection.

[0013] This embodiment uses a simple brazing method and commonly used inexpensive equipm...

specific Embodiment approach 2

[0014] Second embodiment: The difference between this embodiment and the first embodiment is that the thickness of the Ti foil in step one is 50 μm-100 μm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment 3: The difference between this embodiment and the specific embodiment is that the thickness of the Ti foil in step one is 80 μm. Others are the same as the first embodiment.

[0016] The shear strength of the contact reaction brazing joint of the TiAl-based alloy and the Ni-based superalloy obtained in this embodiment is 260 MPa to 290 MPa.

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Abstract

The invention discloses a contact reaction brazing connection method for TiAl based alloy and Ni based high-temperature alloy, relating to a welding method for the TiAl based alloy and the Ni based high-temperature alloy and solving the problems of the traditional diffusion connection method for the TiAl based alloy and the Ni based high-temperature alloy that the process is complicated, the costis high, the connection thermal cycle period is long, the efficiency is low, the requirement on the to-be-welded surface of a weldment is high, a silver brazing joint is not resistant to high temperature, and the brittle phase of high-temperature brazing is easy to aggregate and grow. The method comprises the steps of: treating the to-be- surface of a Ti foil, the TiAl based alloy and the Ni based high-temperature alloy, placing the Ti foil between the TiAl based alloy and the Ni based high-temperature alloy to form a weldment to be welded, and welding the weldment to be welded in a vacuum brazing furnace. The joint obtained in the invention has high shear strength up to 240-300MPa, and the shear strength is 180-210MPa at the high temperature of 800 DEG C, and the joint can be used as a hot end part for aerospace under high-temperature environment.

Description

Technical field [0001] The invention relates to a welding method of TiAl-based alloy and Ni-based high-temperature alloy. Background technique [0002] TiAl-based alloy has low density, high melting point, good high temperature strength and excellent oxidation resistance and creep resistance. It is a new type of lightweight high temperature structural material with broad application prospects in the aviation, aerospace, military and civil fields. At present, most of the hot end parts of aviation and aerospace vehicles use Ni-based superalloys. Although Ni-based superalloys have excellent high-temperature performance, their high density reduces the working efficiency of the aircraft and increases exhaust gas emissions. The application of TiAl-based alloys to replace part of Ni-based superalloy components in aviation and aerospace vehicles can significantly reduce the weight of the aircraft and increase work efficiency. The connection between TiAl-based alloys and Ni-based superal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20
Inventor 林铁松何鹏李海新刘羽
Owner HARBIN INST OF TECH
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