Wire planting reinforced brazing connection method for C/C and C/SiC composite materials and metal

A technology of composite materials and connection methods, which is applied in the field of connection between ceramics and ceramic-based composite materials and metals, can solve the problems of poor joint reliability and low joint strength, and achieve reduced stress concentration, high depth/diameter ratio, and reduced residual heat The effect of stress

Active Publication Date: 2022-04-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to solve the problems of low joint strength and poor joint reliability in the connection between C / C and C / SiC composite materials and metal brazing

Method used

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  • Wire planting reinforced brazing connection method for C/C and C/SiC composite materials and metal
  • Wire planting reinforced brazing connection method for C/C and C/SiC composite materials and metal

Examples

Experimental program
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Effect test

Embodiment 1

[0024] This embodiment is a tungsten (W) wire-planted brazing method for C / C composite material and GH3044 superalloy.

[0025] The C / C composite material involved is a two-dimensional winding and three-dimensional perforated structure, and its density is 1.65-1.78g / cm 3 , cut into 5×5×5mm 3 The block; the GH3044 superalloy involved is a solid solution strengthened Ni-based superalloy with a density of 8.89g / cm 3 , its melting temperature range is 1352-1375°C, and its thermal expansion coefficient is 16.28×10 -6 K -1 , cut into 10×10×3mm 3 of blocks. The diameter of the W wire involved is 0.3mm, and BNi2 is selected as the solder.

[0026] The specific process of this embodiment includes the following steps:

[0027] Step 1, the composite material is punched. Using the method of electric spark drilling, process some regularly distributed blind holes on the surface of the C / C composite material to be welded, and the punching density (the number of holes per unit area) is...

Embodiment 2

[0035] This embodiment is a molybdenum (Mo) wire-planted brazing method for C / C composite material and GH3044 superalloy.

[0036] The C / C composite material involved is a two-dimensional winding and three-dimensional perforated structure, and its density is 1.65-1.78g / cm 3 , cut into 5×5×5mm 3 The block; the GH3044 superalloy involved is a solid solution strengthened Ni-based superalloy with a density of 8.89g / cm 3 , its melting temperature range is 1352-1375°C, and its thermal expansion coefficient is 16.28×10 -6 K -1 , cut into 10×10×3mm 3 of blocks. The diameter of the Mo wire involved is 0.3mm, and BNi2 is selected as the solder.

[0037] The specific process of this embodiment includes the following steps:

[0038] Step 1, the composite material is punched. Using the method of electric spark drilling, process some regularly distributed blind holes on the surface of the C / C composite material to be welded, and the punching density (the number of holes per unit area...

Embodiment 3

[0046] This embodiment is a method for brazing a C / SiC composite material and a GH4169 superalloy with titanium (Ti) wire reinforcement.

[0047] The C / SiC composite material involved is a three-dimensional braided composite material with a density of 2.0-2.1g / cm 3 , The porosity is 10-15%, the fiber bundle is 3K, the fiber volume fraction is 45-50%, cut into 5×5×5mm 3 square; the GH4169 superalloy involved is cut into 10×10×3mm 3 square, the connecting area is 5×5mm 2 ; The diameter of the Ti wire involved is 0.3mm, and 67.6Ag-26.4Cu-6Ti (mass fraction) is selected as the solder.

[0048] The specific process of this embodiment includes the following steps:

[0049] Step 1, the composite material is punched. Using the method of electric spark drilling, process some regularly distributed blind holes on the surface of C / SiC composite material to be welded, and the punching density (the number of holes per unit area) is 36 holes / cm 2 , the hole depth is 2mm, and the hole di...

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Abstract

The invention provides a wire planting reinforced brazing method for C / C and C / SiC composite materials and metal, and belongs to the technical field of heterogeneous material connection. An electric spark punching mode is adopted, certain regularly-distributed blind holes are machined in the to-be-welded face of the composite material in advance, high-strength metal wires (W, Mo, Nb and the like) are implanted into the holes, and the length of the metal wires is controlled so that the metal wires can slightly protrude out of the surface of the composite material; and then the composite material planted with the metal wires is connected with metal in a brazed mode, so that a brazed joint with the high-strength metal wires penetrating through the interface of the composite material / the connecting layer is obtained. According to the connecting method, the interface fracture energy of the composite material / connecting layer can be remarkably increased through the pinning and strengthening effects of the metal wires, and then the high-strength composite material-metal connecting joint is obtained; in addition, low-thermal-expansion metal wires such as W, Mo and Nb are implanted, so that the residual thermal stress of the joint is reduced, the stress distribution state is changed, the stress concentration of the outer surface of the composite material close to the interface is reduced, and the strength and reliability of the joint are further improved.

Description

technical field [0001] The invention belongs to the technical field of connection between ceramics and ceramic-based composite materials and metals, and in particular provides a method of implanting high-strength penetrating metal wires into the "composite material / connecting layer" connection interface, with the aid of the pinning and strengthening effects of the metal wires. A connection method that improves joint strength and reliability. Background technique [0002] Carbon fiber reinforced composites (C / C, C / SiC) are currently very competitive thermal structural materials for extreme environments, with low density, low thermal expansion coefficient, high strength and high modulus at high temperatures, good fracture toughness and wear-resistant / With a series of excellent properties such as anti-scouring, it is an ideal material for manufacturing burner components, turbine blades, rocket nozzles and aerospace thermal protection structures, and has important application v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
Inventor 黄继华王万里牛多欢叶政杨健
Owner UNIV OF SCI & TECH BEIJING
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