Vacuum brazing connection method for C/C radiating fins and Ti tubes

A technology of heat dissipation fins and connection methods, applied in welding/welding/cutting objects, welding equipment, hollow objects, etc., can solve the problems of poor wettability of the base metal and large residual stress, and reduce the thermal expansion coefficient and residual stress. , the effect of low connection temperature

Active Publication Date: 2022-03-29
XIANGTAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the difficulty of welding dissimilar materials, the present invention uses TiZrNiCu paste solder modified by TiC to carry out vacuum brazing to solve the problems of poor wettability of base metal and large residual stress in the welding process, and proposes a C / C cooling fin Vacuum Brazing Connection Method of Sheet and Ti Tube

Method used

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  • Vacuum brazing connection method for C/C radiating fins and Ti tubes
  • Vacuum brazing connection method for C/C radiating fins and Ti tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Pretreatment: Polish the Ti tube with 800-grit water sandpaper to remove the oxide film, put it in acetone for ultrasonic cleaning for 30 minutes, then put it in deionized water for ultrasonic cleaning for 10 minutes, and dry it in a vacuum drying oven;

[0029] b. Brazing material modification: Add -200 mesh commercial TiZrNiCu alloy powder and 3% by mass percentage of TiC powder with a particle size of 3-5 μm into a ball mill tank, add 20% alcohol and ball mill for 18 hours, the ball-to-material ratio is 3:1, After the ball milling is completed, put it in a vacuum drying oven to dry, and then sieve it with a 60-mesh sieve, then add 10% oily binder to the sieved powder and stir it into a paste solder;

[0030] c. Assembly: Pre-assemble the C / C tube and Ti tube and leave a suitable gap space, then fill the gap with the prepared TiZrNiCu paste solder with a blowing ball, and clamp the assembly with a graphite clamp to prevent slide, then place it in a vacuum furnace; ...

Embodiment 2

[0035] a. Pretreatment: Polish the Ti tube with 1000-grit water sandpaper to remove the oxide film, put it in acetone for ultrasonic cleaning for 30 minutes, then put it in deionized water for ultrasonic cleaning for 10 minutes, and dry it in a vacuum drying oven;

[0036] b. Brazing filler metal modification: Add -200 mesh commercial TiZrNiCu alloy powder and 3% by mass percentage of TiC powder with a particle size of 3-5 μm into a ball mill tank, add 20% alcohol and ball mill for 15 hours, the ball-to-material ratio is 3:1, After the ball milling is completed, put it in a vacuum drying oven to dry, and then sieve it with a 60-mesh sieve, then add 10% oily binder to the sieved powder and stir it into a paste solder;

[0037] c. Assembly: Pre-assemble the C / C tube and Ti tube and leave a suitable gap space, then fill the gap with the prepared TiZrNiCu paste solder with a blowing ball, and clamp the assembly with a graphite clamp to prevent slide, then place it in a vacuum furn...

Embodiment 3

[0042] a. Pretreatment: Polish the Ti tube with 1500-grit water sandpaper to remove the oxide film, put it in acetone for ultrasonic cleaning for 30 minutes, then put it in deionized water for ultrasonic cleaning for 10 minutes, and dry it in a vacuum drying oven;

[0043] b. Brazing filler metal modification: Add -200 mesh commercial TiZrNiCu alloy powder and 5% by mass of TiC powder with a particle size of 3-5 μm into a ball mill tank, add 20% alcohol and ball mill for 18 hours, the ball-to-material ratio is 3:1, After the ball milling is completed, put it in a vacuum drying oven to dry, and then sieve it with a 60-mesh sieve, then add 10% oily binder to the sieved powder and stir it into a paste solder;

[0044] c. Assembly: Soak the treated Ti tube in TiZrNiCu paste solder, assemble it with C / C cooling fins after the surface is covered with solder, clamp the assembly with graphite clamps to prevent slipping, and then place it placed in a vacuum furnace;

[0045] d. Brazin...

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Abstract

The invention discloses a vacuum brazing connection method for C/C radiating fins and Ti tubes. The method comprises the following specific process steps: grinding and polishing a Ti pipe to remove an oxide film, and performing vacuum drying for later use after ultrasonic cleaning; tiZrNiCu alloy powder and TiC powder with the mass percent being 3%-5% are mixed, then alcohol is added for ball milling for 15-18 h, the powder is dried and sieved after ball milling, then an oily binder with the mass percent being 8%-10% is added into sieved powder, the mixture is stirred into paste brazing filler metal, then the portion between the connecting surfaces of the C/C cooling fins and the Ti pipe is filled with the paste brazing filler metal, assembling is conducted, and the C/C cooling fins and the Ti pipe are assembled. And the assembly part is clamped by a graphite clamp and then placed in a vacuum furnace, the temperature is increased to 920 DEG C at the speed of 4-7 DEG C/min under the vacuum degree not lower than 1 * 10 <-3 > Pa, heat preservation is conducted for 10-20 min, and finally connection is completed after the furnace is cooled to the room temperature. The connecting method is simple in process, safe, free of pollution, low in cost and high in reliability, and the problems that in the welding process, due to large residual stress, a connecting piece cracks, and wettability between base metal is insufficient are effectively solved.

Description

technical field [0001] The invention relates to a connection method between a composite material and a metal material, in particular to a vacuum brazing connection method between a C / C cooling fin and a Ti tube, and belongs to the field of material connection. Background technique [0002] As humans explore the universe more and more deeply, the development of spacecraft is particularly important. As the development concept of spacecraft tends to be high-power and long-life, space nuclear reactors have become the main choice for spacecraft power supplies. However, the thermoelectric conversion efficiency of space nuclear power supplies is low, and efficient radiators are required to discharge a large amount of waste heat to maintain the normal operation of the power supply. The heat pipe radiator with simple structure and high reliability is the most researched space radiator at home and abroad. At the same time, in the aerospace field where the working conditions are parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K3/06B23K101/14B23K103/18
CPCB23K1/0008B23K1/0012B23K1/20B23K1/206B23K3/06B23K1/008B23K3/0638B23K2101/14B23K2103/18
Inventor 吴靓周子坤肖逸锋张乾坤曾毅熊翔孙妍刘茂胡忠淇郭景平
Owner XIANGTAN UNIV
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