Cobalt-based powder brazing filler metal for high-temperature alloy connecting as well as preparation method and application of cobalt-based powder brazing filler metal

A technology of high-temperature alloys and alloy powders, which is used in welding equipment, metal processing equipment, welding/cutting media/materials, etc., to achieve a wide range of applications, a wide range of brazing temperatures, and small erosion effects.

Active Publication Date: 2019-06-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex internal cooling structure used in the design of turbine blades, guide vanes and other parts, it is difficult to achieve their final structure with precision casting technology alone, and it is necessary to use reliable brazing connection technology to split the complex blades and parts of casting Make high-performance connections
[0003] However, in recent years, due to the renewal of blade materials and the increasingly harsh service environment of blades, the existing high-temperature brazing materials can no longer meet its use requirements, so there is an urgent need to develop new high-temperature alloy brazing materials with wider adaptability and better high-temperature performance , to solve the problem of high-performance joining of nickel-based and cobalt-based superalloys

Method used

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  • Cobalt-based powder brazing filler metal for high-temperature alloy connecting as well as preparation method and application of cobalt-based powder brazing filler metal
  • Cobalt-based powder brazing filler metal for high-temperature alloy connecting as well as preparation method and application of cobalt-based powder brazing filler metal
  • Cobalt-based powder brazing filler metal for high-temperature alloy connecting as well as preparation method and application of cobalt-based powder brazing filler metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The parent material to be welded in this embodiment is a nickel-based superalloy CMSX-4, and the chemical composition of the alloy is (wt.%):

[0033] Ni-9Co-6.5Cr-6W-6.5Ta-5.6Al-3Re-1Ti-0.6Mo.

[0034] The chemical composition of solder is (wt.%):

[0035] Co-21Ni-16Cr-2Al-0.8Ti-14W-0.5Mo-0.5Nb-1Si-2B.

[0036] Brazing material preparation method: mix the raw materials with a purity greater than 99.99% in proportion and put them into a vacuum arc melting furnace to melt them into alloy ingots. The melting process is: 1590°C / 1min→1560°C / 10min→1360°C / 10min→1450°C Pouring; after that, the smelted alloy ingot is melted into a metal liquid flow with a temperature higher than 1400 ° C, and the metal liquid flow is impacted with argon gas to atomize it into fine droplets, and alloy powder is formed after rapid cooling, and sieved out 200 ~ 800 mesh powder. The morphology of the prepared cobalt-based powder solder is as follows: figure 1 As shown, it is spherical or nearly...

Embodiment 2

[0040] The parent material to be welded in this embodiment is a cobalt-based superalloy DZ40M, and the chemical composition of the alloy is (wt.%):

[0041] Co-11Ni-25Cr-7.5W-0.4Ta-1Al-0.2Ti-0.5C-0.2Ti-0.4Mo.

[0042] The chemical composition of solder is (wt.%):

[0043] Co-21Ni-16Cr-2Al-0.3Ti-7W-1Mo-0.5Nb-2Fe-2Si-2.8B.

[0044] Brazing material preparation method: mix the raw materials with a purity greater than 99.99% in proportion and put them into a vacuum arc melting furnace to melt them into alloy ingots. The melting process is: 1590°C / 1min→1540°C / 10min→1340°C / 10min→1440°C Pouring; after that, the smelted alloy ingot is melted into a metal liquid flow with a temperature higher than 1400 ° C, and the metal liquid flow is impacted with argon gas to atomize it into fine droplets, and alloy powder is formed after rapid cooling, and sieved out 200 ~ 800 mesh powder.

[0045] Before welding, the solid solution cobalt-based superalloy DZ40M is processed into Use No. 800 sa...

Embodiment 3

[0048] The parent material to be welded in this embodiment is cobalt-based superalloy DD688, and the chemical composition of the alloy is (wt.%):

[0049] Co-15Ni-5Cr-10W-7Ta-4Al-1.2Hf-1.8Ti-4Mo.

[0050] The solder composition is (wt.%):

[0051] Co-21Ni-16Cr-2Al-0.5Ti-12W-0.5Mo-0.5Nb-1.2Si-2B.

[0052] Brazing material preparation method: mix the raw materials with a purity greater than 99.99% in proportion and put them into a vacuum arc melting furnace to melt them into alloy ingots. The melting process is: 1590°C / 1min→1555°C / 10min→1355°C / 10min→1455°C Pouring; after that, the smelted alloy ingot is melted into a metal liquid flow with a temperature higher than 1400 ° C, and the metal liquid flow is impacted with argon gas to atomize it into fine droplets, and alloy powder is formed after rapid cooling, and sieved out 200 ~ 800 mesh powder.

[0053] Before welding, the solid solution cobalt-based superalloy DD688 is processed into Use No. 800 sandpaper to grind the surf...

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Abstract

The invention discloses cobalt-based powder brazing filler metal for high-temperature alloy connecting as well as a preparation method and application of the cobalt-based powder brazing filler metal,and belongs to the technical field of high-temperature alloy brazing materials. The brazing filler metal comprises the following chemical components of, in percentage by weight, 12.0-22.0% of Cr, 15.0-30.0% of Ni, 4.0-17.0% of W, 0.5-6.5% of Al, 0.5-8.5% of Mo, 0-8.0% of Ti, 0-3.0% of Si, 0-3.0% of B, 0-7.5% of Fe, 0.2-5.0% of Nb, and the balance Co. The powder brazing filler metal is prepared bya gas atomization method and is used for high-temperature alloy brazing connection. The brazing temperature is 1170-1270 DEG C, and the brazing time is 10-150 minutes. The cobalt-based powder brazingfiller metal solves the high-performance brazing connection problem of the high-temperature alloy, and has important application value.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy connection, in particular to a cobalt-based powder solder alloy for high-temperature alloy connection and its preparation method and application. The solder alloy is suitable for vacuum brazing of high-temperature alloys. Background technique [0002] Superalloys refer to high-alloyed iron-based, nickel-based or cobalt-based austenitic metal materials that can withstand high complex stresses at temperatures above 600°C and have surface stability. Since their inception, they have been widely used in aero-engines and In the hot end parts of various industrial gas turbines. However, due to the complex internal cooling structure used in the design of turbine blades, guide vanes and other parts, it is difficult to achieve their final structure with precision casting technology alone, and it is necessary to use reliable brazing connection technology to split the complex blades and parts o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40B23K1/008
Inventor 侯星宇孙元周亦胄候桂臣
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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