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. , to achieve the effect of good joint performance, high production efficiency and reduced welding cost

Active Publication Date: 2011-02-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 one: the contact reaction brazing connection method of the TiAl-based alloy and the Ni-based superalloy of the present embodiment is carried out according to the following steps: 1. Treat the surface to be welded of the Ti foil, the TiAl-based alloy and the Ni-based superalloy ; 2. Put the Ti foil between the TiAl-based alloy and the Ni-based superalloy to form the piece to be welded; 3. Place the piece to be welded in a vacuum brazing furnace and fix it with a pre-pressure of 0.001MPa to 0.01MPa. Then in a vacuum of 1.0×10 -3 Pa~7.0×10 -3 Under the condition of Pa, heat up to 790℃~810℃ at a speed of 5℃ / min~20℃ / min, keep it warm for 8min~12min, and then continue heating to 960℃~ at a speed of 5℃ / min~20℃ / min 1040°C, keep warm for 1min to 30min, then cool down to 300°C to 500°C at a rate of 5°C / min to 20°C / min, then cool down to room temperature with the furnace to complete the connection.

[0013] In this embodiment, a simple brazing method is used,...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that the thickness of the Ti foil in step 1 is 50 μm˜100 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and the specific embodiment is that the thickness of the Ti foil in step 1 is 80 μm. Others are the same as in the first embodiment.

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

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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 cost is 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 for a TiAl base alloy and a Ni base superalloy. Background technique [0002] TiAl-based alloys are new lightweight high-temperature structural materials with broad application prospects in aviation, aerospace, military and civil fields due to their low density, high melting point, good high-temperature strength, and excellent oxidation resistance and creep resistance. At present, Ni-based superalloys are mostly used in the hot end parts of aviation and aerospace vehicles. Although Ni-based superalloys have excellent high-temperature performance, their density is high, which reduces the working efficiency of the aircraft and increases exhaust emissions. Applying TiAl-based alloys instead of some Ni-based superalloy components to 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 superalloys has ...

Claims

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Application Information

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Patent Type & Authority Applications(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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