Method for realizing TiAl-based alloy connection by adopting Al foil as intermediate layer

A technology of base alloy and intermediate layer, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of low high temperature strength of TiAl alloy joints, deterioration of joint corrosion and oxidation resistance, etc., to achieve stable welding quality, The effect of reducing energy consumption and reducing requirements

Inactive Publication Date: 2011-08-17
HARBIN INST OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems that the current TiAl alloy joints obtained by brazing have low high-temperature strength, and the introduction of impurity elements that do not exist in t

Method used

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  • Method for realizing TiAl-based alloy connection by adopting Al foil as intermediate layer
  • Method for realizing TiAl-based alloy connection by adopting Al foil as intermediate layer

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specific Embodiment approach 1

[0013] Specific Embodiment 1: In this embodiment, a method of using Al foil as an intermediate layer to realize the connection of TiAl-based alloys is carried out in the following steps: 1. The TiAl-based alloys are processed into the required size by wire cutting to obtain TiAl to be welded 2. Polish the connection surface of the TiAl-based alloy to be welded with sandpaper, and then put the connection surface into acetone and ultrasonically clean it for 5-10 minutes; 3. Then place the Al foil with a thickness of 15-25 μm on the Apply a pressure of 0.01 to 0.1 MPa between the joint surfaces of the welded TiAl-based alloy, place it in a vacuum heating furnace for welding, and when the vacuum degree in the vacuum heating furnace reaches 1×10 -3 ~2×10 -2 After Pa, start heating with electricity at a heating rate of 30-50°C / min, heat it to 1100-1200°C and keep it at this temperature for 4-8 hours, and then cool it to room temperature at a cooling rate of 5-10°C / min to complete Ti...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 2, put the connection surface into acetone and ultrasonically clean it for 8 minutes. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in Step 3, an Al foil with a thickness of 18-23 μm is placed between the connecting surfaces of the TiAl-based alloy to be welded. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for realizing TiAl-based alloy connection by adopting an Al foil as an intermediate layer and relates to a TiAl-based alloy connection method. The method solves the problems that the existing TiAl alloy joint obtained through soldering has low high-temperature strength, and impurity elements which do not exist in TiAl alloy base materials are led in the connection process to cause that the corrosion resistance, the oxidation resistance and other properties of the joint are deteriorative. The method comprises the following steps: firstly, machining TiAl-based alloy into the required dimension; secondly, polishing after TiAl-based alloy connection surfaces are polished by sand paper and placing into acetone for ultrasonic cleaning; thirdly, placing the Al foil among the connection surfaces, applying the pressure, placing into a vacuum heating furnace for welding, heating and heat preservation and cooling to the room temperature, namely finishing the TiAl-based alloy connection. A welded joint or a joint of the TiAl-based alloy connected by the method can be used at the high temperature of 600-800 DEG C so as to avoid the leading-in of other impurities in the welding process. The method is applied to the technical field of TiAl-based alloy connection.

Description

technical field [0001] The invention relates to a TiAl-based alloy connection method. Background technique [0002] TiAl-based alloy is a new type of lightweight high-temperature structural material, with a density less than 50% of that of nickel-based superalloys. It has light weight, high specific strength, high specific rigidity, corrosion resistance, wear resistance, high temperature resistance and excellent oxidation resistance. It has excellent mechanical properties at room temperature and high temperature. As one of the candidate high-temperature materials to replace some high-temperature alloys and titanium alloys in the fields of contemporary aerospace, weapon industry, and automobile industry, it has important engineering application potential. [0003] The welding of TiAl-based alloys is an important prerequisite and guarantee for its wide application. However, due to the intrinsic brittleness of TiAl-based alloys and their low room temperature plasticity, it is ...

Claims

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Application Information

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IPC IPC(8): B23K20/22B23K20/24
Inventor 曹健宋晓国司国栋冯吉才张丽霞窦冬柏
Owner HARBIN INST OF TECH
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