Vacuum brazing process for reducing corrosion of GH3536 honeycomb and GH4738 ring assembly

A brazing process and assembly technology, which is applied in the welding field of nickel-based superalloys, can solve problems such as hindering the development and application of vacuum brazing alloy components, reducing the strength of honeycomb structures, and severe corrosion of honeycomb feet, so as to achieve the reduction of base metal alloys. Dissolution, improve structural strength, reduce the effect of alloy corrosion

Active Publication Date: 2022-06-03
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the existing brazing process is used to connect the GH3536 honeycomb and the GH4738 ring, the liquid solder will severely erode the honeycomb foot, which reduces the structural strength of the honeycomb and seriously hinders the Development and Application of Vacuum Brazed Alloy Components

Method used

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  • Vacuum brazing process for reducing corrosion of GH3536 honeycomb and GH4738 ring assembly
  • Vacuum brazing process for reducing corrosion of GH3536 honeycomb and GH4738 ring assembly
  • Vacuum brazing process for reducing corrosion of GH3536 honeycomb and GH4738 ring assembly

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Use wire cutting to process the honeycomb into the required size; use 400#, 800# and 1200# sandpapers in turn to polish the surfaces to be welded of the honeycomb and the ring to remove the oxide scale on the surface of the base metal alloy and obtain a smooth surface; Acetone wipes the surface of the base metal to remove oil and other impurities;

[0032] Step 2: Use the gun electrode to position the honeycomb on the ring to complete the assembly and positioning;

[0033] Step 3: Apply the prepared paste solder evenly between the honeycomb and the ring, and apply a flow blocking agent around the joint surface of the two to prevent the solder from flowing during the brazing process; the solder is nickel-based The brazing filler metal has a boron content of 2.4wt.% and a melting point of 991°C; the amount of brazing filler metal is controlled at about 2 times that required to fill the weld;

[0034] Step 4: Put the assembled assembly into the vacuum brazing furn...

Embodiment 2

[0041] Step 1: Use wire cutting to process the honeycomb into the required size; use 400#, 800# and 1200# sandpapers in turn to polish the surfaces to be welded of the honeycomb and the ring to remove the oxide scale on the surface of the base metal alloy and obtain a smooth surface; Acetone wipes the surface of the base metal to remove oil and other impurities;

[0042] Step 2: Use the gun electrode to position the honeycomb on the ring to complete the assembly and positioning;

[0043] Step 3: Evenly coat the prepared paste solder between the honeycomb and the ring, and apply a flow blocking agent around the joint surface of the two to prevent the solder from flowing during the brazing process; the solder is nickel-based The brazing filler metal has a boron content of 2.4wt.% and a melting point of 991°C; the filler filler content is controlled at about 2 times that required to fill the weld;

[0044] Step 4: Put the assembled assembly into the vacuum brazing furnace, and t...

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Abstract

The invention discloses a vacuum brazing process for reducing corrosion of an assembly of a GH3536 honeycomb and a GH4738 ring piece, and belongs to the technical field of welding of nickel-based high-temperature alloy. Comprising the following steps that oxide skin, oil stains and other impurities on the surface to be welded are removed; assembling and positioning the honeycomb and ring assembly; brazing filler metal is preset, the melting point of the brazing filler metal ranges from 985 DEG C to 995 DEG C, the boron content is not higher than 2.5 wt.%, and the use amount is controlled to be about two times of the use amount needed for filling a weld joint; and vacuum brazing treatment is conducted, the brazing temperature ranges from 1030 DEG C to 1040 DEG C, and the heat preservation time ranges from 6 min to 10 min. According to the method, the brazing heat preservation temperature and heat preservation time are optimized, the content of boron in the brazing filler metal and the using amount of the brazing filler metal are strictly controlled, an unexpected effect is achieved in the aspect of reducing base metal alloy corrosion, and then the structural strength of the honeycomb is improved. After being treated by the process, the tensile strength of a brazed joint at 730 DEG C is about 290 MPa, and the requirements of technical conditions are completely met.

Description

technical field [0001] The invention belongs to the technical field of welding of nickel-based superalloys, and in particular relates to a vacuum brazing process for reducing the corrosion of a GH3536 honeycomb and GH4738 ring assembly. Background technique [0002] Superalloy, also known as "superalloy", is a metal material with excellent high temperature mechanical properties, oxidation resistance and microstructure stability developed with the aviation industry. In the development of advanced aero-engines, the amount of superalloys has accounted for 40%-60% of the total weight of the engine. Nickel-based superalloys use nickel as the matrix, which has excellent comprehensive properties and relatively low cost, and has gradually become a key material to promote the advancement of engine technology. [0003] With the continuous promotion of nickel-based superalloys in aero-engines, related processing technologies, especially welding technologies, have attracted much attent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/20Y02E30/30
Inventor 郑磊魏鑫金莹刘红亮赵鑫邰清安孟晔王丹
Owner UNIV OF SCI & TECH BEIJING
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