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Method for brazing SiCf/SiC ceramic-based composite material and nickel-based superalloy

A technology of nickel-based superalloys and composite materials, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problem of large differences in thermal expansion coefficient and elastic modulus, difficult connection of ceramic matrix composite materials, and mismatching degree of deformation The problem of increasing the degree of increase, to achieve the effect of promoting diffusion, good application prospects, and reducing generation

Pending Publication Date: 2022-01-11
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the physical properties of ceramic matrix composites and nickel-based superalloys are quite different, coupled with the special properties of ceramics, so it is difficult to connect with metals or ceramic matrix composites themselves.
The difference in physical properties is mainly due to SiC f / SiC ceramic matrix composites and nickel-based GH536 have a large difference in thermal expansion coefficient and elastic modulus, and the linear expansion coefficient of nickel-based GH536 increases with the increase of temperature, which makes the degree of deformation of the two in the welding thermal cycle The degree of mismatch increases, resulting in a large residual stress at the joint, which has a serious damage to the mechanical properties of the joint

Method used

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  • Method for brazing SiCf/SiC ceramic-based composite material and nickel-based superalloy

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Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1 of the present invention discloses a SiC f The method for brazing / SiC ceramic matrix composite material and nickel base superalloy specifically comprises the following steps:

[0061] (1) Polish the nickel-based superalloy and solder foil with 200-mesh, 400-mesh, 600-mesh and 800-mesh sandpaper in sequence, and then add acetone to ultrasonic pretreatment for 10min-20min to remove surface impurities to obtain pretreated nickel-based high-temperature Alloy and pretreated solder foil; wherein, the ultrasonic pretreatment frequency is 40KHz;

[0062] The nickel-based superalloy is GH536 alloy, with a size of 5mm×7mm×2mm;

[0063] The solder foil is AgCuTi solder foil with a thickness of 50 μm and a size of 5mm×4mm;

[0064] (2) Grinding the ceramic matrix composite material with 800-mesh sandpaper, adding it to acetone, ultrasonic pretreatment for 10 minutes, and removing surface impurities to obtain a pretreated ceramic matrix composite material; wherein, th...

Embodiment 2

[0072] Embodiment 2 of the present invention discloses a C f The method for brazing of / C ceramic matrix composite material and nickel-base superalloy specifically comprises the following steps:

[0073] (1) Polish the nickel-based superalloy and solder foil with 200-mesh, 400-mesh, 600-mesh and 800-mesh sandpaper in sequence, and then add acetone for ultrasonic pretreatment for 10 minutes to remove surface impurities to obtain pretreated nickel-based superalloy and Pretreating the solder foil; wherein, the ultrasonic pretreatment frequency is 40KHz;

[0074] The nickel-based superalloy is GH536 alloy, with a size of 5mm×7mm×2mm;

[0075] The solder foil is AgCuTi solder foil with a thickness of 50 μm and a size of 5mm×4mm;

[0076] (2) Grinding the ceramic matrix composite material with 800-mesh sandpaper, adding it to acetone, ultrasonic pretreatment for 10 minutes, and removing surface impurities to obtain a pretreated ceramic matrix composite material; wherein, the ultra...

Embodiment 3

[0084] Embodiment 3 of the present invention discloses a SiC f The method for brazing / SiC ceramic matrix composite material and nickel base superalloy specifically comprises the following steps:

[0085] (1) Polish the nickel-based superalloy and solder foil with 200-mesh, 400-mesh, 600-mesh and 800-mesh sandpaper in sequence, and then add acetone to ultrasonic pretreatment for 10min-20min to remove surface impurities to obtain pretreated nickel-based high-temperature Alloy and pretreated solder foil; wherein, the ultrasonic pretreatment frequency is 40KHz;

[0086] The nickel-based superalloy is GH536 alloy, with a size of 5mm×7mm×2mm;

[0087] The solder foil is AgCuTi solder foil with a thickness of 50 μm and a size of 5mm×4mm;

[0088] (2) Grinding the ceramic matrix composite material with 800-mesh sandpaper, adding it to acetone, ultrasonic pretreatment for 10 minutes, and removing surface impurities to obtain a pretreated ceramic matrix composite material; wherein, th...

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Abstract

The invention discloses a method for brazing a SiCf / SiC ceramic-based composite material and nickel-based superalloy, specifically comprising: pre-treating nickel-based superalloy, a brazing filler metal foil, a ceramic-based composite material and foamy copper to obtain pre-treated nickel-based superalloy, pre-treated brazing filler metal foil, pre-treated ceramic-based composite material and pre-treated foamy copper; and sequentially stacking and then brazing the pretreated nickel-based high-temperature alloy, the pretreated brazing filler metal foil, the pretreated foamy copper, the pretreated brazing filler metal foil and the pretreated SiCf / SiC ceramic-based composite material to obtain the SiCf / SiC ceramic-based composite material and nickel-based high-temperature alloy brazed material. According to the method disclosed by the invention, the mechanical property of a brazed joint is remarkably improved, so that a SiCf / SiC ceramic-based composite material and nickel-based superalloy brazed material with excellent use performance can be obtained.

Description

technical field [0001] The present invention relates to SiC f / SiC ceramic matrix composite material technical field, more specifically relate to a kind of SiC f A method for brazing SiC ceramic matrix composites and nickel-based superalloys. Background technique [0002] SiC f / SiC ceramic matrix composite material is a new type of material obtained by compounding SiC fiber and SiC matrix through a special process. It has outstanding characteristics such as high temperature resistance, high strength, corrosion resistance, and wear resistance. It is widely used in aerospace, nuclear energy, and electronics. important industrial fields. The composite addition of silicon carbide fibers overcomes the shortcomings of the ceramic itself, such as poor bending resistance and fracture toughness, to a certain extent; and silicon carbide fibers have better oxidation resistance and better compatibility with the silicon carbide matrix, so SiC f / SiC ceramic matrix composites maintai...

Claims

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Application Information

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IPC IPC(8): B23K1/20B23K1/00
CPCB23K1/20B23K1/206B23K1/00
Inventor 郭伟张瑜张宏强
Owner BEIHANG UNIV
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