A high-performance brazing method for ni3al-based single crystal alloys

A brazing method and single-crystal-based technology, which is applied in welding equipment, welding medium, metal processing equipment, etc., can solve problems such as strict weld gap control requirements, impact on structure and performance, and poor process applicability, and achieve interface The effect of good organization, good combination, and mechanical properties up to standard

Active Publication Date: 2021-01-26
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ni3Al belongs to the Ni-Al series intermetallic compound. The content of Al, W, Ta and other elements in the Ni3Al-based single crystal alloy is relatively high, so it is difficult to weld by welding methods such as argon arc welding, laser welding, electron beam welding, and plasma arc welding. , not only prone to cracks, but also the recrystallization of the base metal due to local melting and cooling during the fusion welding process will have a great impact on its structure and properties; although the transient liquid phase diffusion bonding (TLP) can realize the Ni3Al-based single crystal alloy Effective connection, but the holding time of TLP diffusion welding is long (generally more than 20h), low efficiency, high cost, and strict requirements for pre-weld assembly and weld gap control, poor process applicability

Method used

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  • A high-performance brazing method for ni3al-based single crystal alloys
  • A high-performance brazing method for ni3al-based single crystal alloys
  • A high-performance brazing method for ni3al-based single crystal alloys

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Effect test

Embodiment I

[0028] The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0029] Step 1: Clean up before welding

[0030] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The dimensions shown are (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 15 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0031] Step 2: Assembly positioning

[0032] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butt-jointed and assembled along the axial direction, and the brazing gap of the joint 5 to be welded is controlled to be 50 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the...

Embodiment 2

[0044]The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0045] Step 1: Clean up before welding

[0046] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The shown size is (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 20 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0047] Step 2: Assembly positioning

[0048] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butted together along the axial direction to be welded, and the brazing gap of the joint 5 to be welded is controlled to be 100 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the ends...

Embodiment 3

[0060] The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0061] Step 1: Clean up before welding

[0062] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The shown size is (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 20 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0063] Step 2: Assembly positioning

[0064] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butted together along the axial direction to be welded, and the brazing gap of the joint 5 to be welded is controlled to be 200 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the end...

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Abstract

The invention belongs to the technical field of welding, in particular to a Ni 3 High performance brazing method for Al-based single crystal alloys. A new type of high temperature resistant Ni-Cr-W-Mo-Si solder was applied and a suitable for the solder and Ni 3 The brazing process of Al-based single crystal alloy mainly includes the steps of pre-welding cleaning, assembly positioning, presetting solder, vacuum brazing, and post-welding heat treatment. Using the solder and technology used in the present invention can obtain excellent brazing joint structure, the brazing seam and the base metal interface are well combined, and the brazing seam has no welding defects and low melting point phases simultaneously, and the Ni brazed according to the technology 3 Al-based single crystal alloy brazed joints have high mechanical properties that meet the requirements of use.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a high-performance brazing method for a Ni3Al-based single crystal alloy. Background technique [0002] In response to the demand for the service performance of aero-engine turbine blades, Ni3Al-based single crystal alloys with high melting point, low density, good oxidation resistance, and high-temperature strength have been independently developed in China, and have been continuously developed under the impetus of the performance improvement of advanced aero-engines. , the temperature bearing capacity of the new generation of Ni3Al-based single crystal alloys has reached or exceeded 1100 °C. [0003] With the application of Ni3Al-based single crystal alloy materials, the related processing technology has attracted much attention. Especially in the welding technology of the alloy, it is not only required to have high strength of the welded joint under high temperature conditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23K3/08B23K35/30
CPCB23K1/008B23K1/20B23K1/206B23K3/08B23K35/304
Inventor 孔庆吉刘纪德赵伟徐彦强刘悦
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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