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C/C radiating fin and stainless steel connection method

A technology of heat dissipation fins and connection methods, applied in the field of connection between composite materials and metals, can solve the problems of large difference in physical and chemical properties, large residual thermal stress of connecting parts, mismatched thermal expansion coefficients, etc., and achieves low cost, complete structure, The effect of high connection strength

Inactive Publication Date: 2017-03-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are difficulties in the connection between C / C composite materials and stainless steel at present. The difficulty lies in the large difference in physical and chemical properties between the two. The mismatch of thermal expansion coefficients will cause large residual thermal stress in the joints and induce cracks in the joints. Produced at or near the interface, eventually leading to premature failure and fracture of the joint

Method used

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  • C/C radiating fin and stainless steel connection method
  • C/C radiating fin and stainless steel connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (A) Pretreatment of the joining surface;

[0024] Grind and polish the surface connected to the C / C cooling fins and stainless steel pipes, and ultrasonically clean them in absolute ethanol for 30 minutes, and dry them in an oven for later use.

[0025] (B) preparation of solder;

[0026] Take the Ag powder, Cu powder and Ti powder with a particle size of 500 mesh, mix the three simple powders according to the proportion of Ag-26.7Cu-4.5Ti, add 10% alcohol, and put them into a planetary ball mill tank for mechanical ball milling. The ball milling time is 40h, and the effect of solder alloying has been achieved. After ball milling, dry the solder powder, and use paraffin wax and vaseline to prepare the dried solder powder into a slurry at a ratio of 1:1 for later use.

[0027] (C) connection process;

[0028] Apply the paste-like solder prepared in (B) above to the connection end surface of the C / C cooling fins and stainless steel tubes treated by (A), then superimpos...

Embodiment 2

[0030] (A) Pretreatment of the joining surface;

[0031] Grind and polish the surface connected to the C / C cooling fins and stainless steel pipes, and ultrasonically clean them in absolute ethanol for 30 minutes, and dry them in an oven for later use.

[0032] (B) preparation of solder;

[0033] Take the Ag powder, Cu powder and Ti powder with a particle size of 500 mesh, mix the three simple powders according to the proportion of Ag-26.7Cu-4.5Ti, add 10% alcohol, and put them into a planetary ball mill tank for mechanical ball milling. The ball milling time is 40h, and the effect of solder alloying has been achieved. After ball milling, dry the solder powder, and use paraffin wax and vaseline to prepare the dried solder powder into a slurry at a ratio of 1:1 for later use.

[0034] (C) connection process;

[0035] Apply the paste-like solder prepared in (B) above to the connection end surface of the C / C cooling fins and stainless steel tubes treated by (A), then superimpos...

Embodiment 3

[0037] (A) Pretreatment of the joining surface;

[0038] Grind and polish the surface connected to the C / C cooling fins and stainless steel pipes, and ultrasonically clean them in absolute ethanol for 30 minutes, and dry them in an oven for later use.

[0039] (B) preparation of solder;

[0040] Take the Ag powder, Cu powder and Ti powder with a particle size of 500 mesh, mix the three simple powders according to the proportion of Ag-26.7Cu-4.5Ti, add 10% alcohol, and put them into a planetary ball mill tank for mechanical ball milling. The ball milling time is 40h, and the effect of solder alloying has been achieved. After ball milling, dry the solder powder, and use paraffin wax and vaseline to prepare the dried solder powder into a slurry at a ratio of 1:1 for later use.

[0041] (C) connection process;

[0042] Apply the paste-like solder prepared in (B) above to the connection end surface of the C / C cooling fins and stainless steel tubes treated by (A), then superimpos...

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Abstract

The invention relates to a C / C radiating fin and stainless steel connection method. A vacuum brazing connection method is adopted. High-thermal-conductivity Ag-based braze alloy is used as an intermediate layer. Compared with other dissimilar material connection methods, the C / C radiating fin and stainless steel connection method has the advantages of being high in efficiency, fast, low in cost and particularly rotary shaft connection of large irregular parts. The method comprises the specific technological steps that connection surfaces of a C / C radiating fin and stainless steel are ground and polished, and the C / C radiating fin and the stainless steel are placed in anhydrous ethanol for ultrasonic cleaning and then are dried; self-made AgCuTi braze alloy is prepared into slurry, and the connecting end faces of the C / C radiating fin and the stainless steel are coated with the slurry; the two connection fracture surfaces are overlapped, and a sample is clamped by using a designed fixture; and then the C / C radiating fin and the stainless steel are placed into a vacuum brazing furnace horizontally for connection. The connection method provided by the invention has the advantages of simple process, safety, reliability, low cost and high connection strength.

Description

technical field [0001] The invention belongs to a method for connecting composite materials and metals, and relates to a method for connecting C / C cooling fins and stainless steel. Background technique [0002] With the development of modern industrial level and national defense technology, heat dissipation has become a key technology in many fields. The electronic equipment of the thermal control system of aerospace vehicles tends to be smaller and more efficient, lighter in weight, and more compact in structure. During operation, a large amount of heat will be generated and accumulated, and there are special and strict requirements for the materials used; Large-area thin-plate structures, missile nose cones, solid rocket motor nozzles and other severe parts in the aerospace field, as well as plasma materials used in nuclear fusion reactors, require materials with light weight, high thermal conductivity, high mechanical properties and other excellent comprehensive propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
CPCC04B37/026C04B2237/125C04B2237/126C04B2237/127C04B2237/385C04B2237/406C04B2237/52
Inventor 张守阳袁野苏杨杨李贺军李伟黄立叶
Owner NORTHWESTERN POLYTECHNICAL UNIV
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