CN114247947A - Vacuum brazing connection method of C/C radiating fins and Ti tube - Google Patents
Vacuum brazing connection method of C/C radiating fins and Ti tube Download PDFInfo
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- CN114247947A CN114247947A CN202210034196.0A CN202210034196A CN114247947A CN 114247947 A CN114247947 A CN 114247947A CN 202210034196 A CN202210034196 A CN 202210034196A CN 114247947 A CN114247947 A CN 114247947A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0012—Brazing heat exchangers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
- B23K3/0638—Solder feeding devices for viscous material feeding, e.g. solder paste feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
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Abstract
The invention discloses a vacuum brazing connection method of a C/C radiating fin and a Ti tube. The specific process steps are as follows: polishing the Ti tube to remove an oxide film, ultrasonically cleaning, and then drying in vacuum for later use; mixing TiZrNiCu alloy powder and 3-5% TiC powder by mass percent, adding alcohol for ball milling for 15-18h, drying and sieving the powder after ball milling, adding 8-10% of oily binder by mass percent into the powder under the sieve for stirring to form paste solder, and filling the paste solder in C/C powderAssembling the connecting surfaces of the heat fins and the Ti tube, clamping the assembly with graphite jig, and placing in a vacuum furnace at a temperature of not less than 1 × 10‑3And (3) heating to 920 ℃ at the speed of 4-7 ℃/min under the vacuum degree of Pa, preserving the heat for 10-20min, and finally cooling the furnace to room temperature to complete connection. The connection method provided by the invention has the advantages of simple process, safety, no pollution, low cost and high reliability, and effectively solves the problems of cracking of the connecting piece and insufficient wettability between parent metals caused by large residual stress in the welding process.
Description
Technical Field
The invention relates to a method for connecting a composite material and a metal material, in particular to a method for connecting a C/C radiating fin and a Ti tube by vacuum brazing, and belongs to the field of material connection.
Background
With the increasingly deep exploration of the universe by human beings, the development of spacecrafts is particularly important. Because the development concept of the spacecraft tends to high power and long service life, the space nuclear reactor becomes the main choice of the power supply of the spacecraft, and the thermoelectric conversion efficiency of the space nuclear power supply is low, so that a high-efficiency radiator is required to discharge a large amount of waste heat to maintain the normal work of the power supply. The heat pipe radiator with simple structure and high reliability is a space radiator which is most studied at home and abroad. Meanwhile, in the aerospace field (large-area thin plate structure on the spacecraft, missile nose cone, solid rocket engine nozzle and the like) with severe working conditions, the heat dissipation material is required to have excellent comprehensive properties such as high heat conductivity, low density, ablation resistance, good oxidation resistance and mechanical property, and compared with the traditional heat conduction metal (such as copper, aluminum and the like), the C/C composite material has higher integral isothermal property and better heat dissipation efficiency, has lower density and thermal expansion coefficient, higher specific strength and corrosion resistance and the like compared with the metal material, and can replace copper as a new choice of heat pipe type radiator fin material.
The key point of the design of the spacecraft lies in the light weight of equipment, and metal Ti is widely used in the aerospace field due to the characteristics of light weight and high specific strength. Although the heat conductivity coefficient of Ti is lower than that of carbon steel and copper, the thickness of the Ti tube can be greatly reduced due to the excellent corrosion resistance of Ti, and the heat exchange mode of the surface and steam is drop-shaped condensation, so that the thermal resistance is reduced, and the heat exchange performance of Ti is obviously improved, therefore, Ti is a better choice as a heat tube type radiator material in the aerospace field than carbon steel and copper.
The C/C fin and the Ti tube can be used as a heat pipe type radiator after being connected and applied to the field of spaceflight. However, due to the poor wettability between the C/C composite material and Ti and the difference of the thermal expansion coefficients of the C/C composite material and the Ti, a large residual thermal stress is generated in the welding process, and the C/C tube is cracked. The brazing can be carried out under the condition of no pressure or small pressure, the requirement on the surface working condition of the base metal is not high, and the brazing method for connecting the C/C fin and the Ti tube can solve the problem of poor wettability of the base metal and reduce residual thermal stress.
At present, many brazing reports about graphite and metal are reported at home and abroad, and the adopted brazing filler metals mainly comprise silver-based brazing filler metals, copper-based brazing filler metals, titanium-based brazing filler metals, nickel-based brazing filler metals and some precious metal brazing filler metals. The noble metal solder is expensive, the service temperature of the common silver-based solder and copper-based solder is not more than 773K, the soldering joint of the nickel-based solder has better high-temperature performance, but the soldering temperature of the common nickel-based solder is more than 1273K and exceeds the phase transition temperature of Ti, which inevitably affects the performance of a base metal. The TiZrNiCu brazing filler metal is prepared by adding melting-reducing elements Zr, Ni and Cu on the basis of Ti, the melting point of the TiZrNiCu brazing filler metal is about 1123K, the brazing temperature is lower than the phase transition temperature of Ti, and the TiZrNiCu brazing filler metal with lower connection temperature and better high-temperature mechanical property is a good choice for connecting C/C and Ti.
On the other hand, in the case of a liquid,one method of reducing the thermal stress of solder joints that has gained increased attention in recent years is to reduce the coefficient of thermal expansion of the joint layer by introducing a reinforcing phase with a low coefficient of expansion into the joint layer, such as Al2O3SiC and TiN ceramic particles, metal W particles and C short fibers are respectively added into the brazing filler metal to connect the nonmetal and the metal materials, and a certain effect is achieved. The thermal expansion coefficient of Ti is 9.41-10.03X 10-6The C/C composite material has a coefficient of thermal expansion in the radial direction of 5 to 6 x 10 at/° C-6/° C, whereas the coefficient of thermal expansion of TiC is only 7.74X 10-6Adding TiC into the brazing filler metal can not only reduce the thermal expansion coefficient of a brazing filler metal connecting layer, but also form a thermal expansion coefficient gradient transition layer between two base materials, so that the generation of residual thermal stress in the welding process can be effectively reduced, the deformation of a joint and the base materials is reduced, the bonding strength of the welding joint is improved, and the cracking tendency of a connecting piece is avoided.
Aiming at the difficulty of welding dissimilar materials, the invention utilizes TiC modified TiZrNiCu paste solder to carry out vacuum brazing so as to solve the problems of poor wettability of parent metal and larger residual stress in the welding process, and provides a vacuum brazing connection method of a C/C radiating fin and a Ti tube.
Disclosure of Invention
The invention discloses a vacuum brazing connection method of a C/C radiating fin and a Ti tube, which is characterized by comprising the following steps of:
a. pretreatment: polishing a Ti pipe by using water sand paper with the granularity of being smaller than 800 to remove an oxide film, putting the Ti pipe into acetone for ultrasonic cleaning for 30min, putting the Ti pipe into deionized water for ultrasonic cleaning for 10min, and putting the Ti pipe into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the particle size of 3-5 mu m into a ball milling tank, adding 20% alcohol for ball milling, wherein the ball-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven for drying, sieving the ball milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the mixture to form paste solder;
c. assembling: filling a TiZrNiCu paste solder between the connecting surfaces of the C/C radiating fins and the ground Ti tube, assembling, clamping an assembly part by a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: starting the vacuum furnace to heat, the vacuum degree is not less than 1 × 10-3Pa, the heating rate is 4-7 ℃/min, the temperature is increased to 920 ℃, and then the temperature is kept for 10-20 min;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
The mass percent of the TiC powder added in the step b is 3-5%.
The mass percentage of the oily binder added in the step b is 8-10%.
And c, filling the brazing filler metal in the step c by one of a grouting method, a soaking method and a brushing method. Wherein, the grouting method is to preassemble a C/C pipe and a Ti pipe and leave a proper gap space, and then to fill the prepared TiZrNiCu paste solder into the gap by blowing balls; the soaking method is that the processed Ti tube is soaked in the TiZrNiCu paste solder, and the Ti tube is assembled with the C/C radiating fin after the surface of the Ti tube is covered with the solder; the brush coating method is that a slender roller brush is used for uniformly brushing the TiZrNiCu paste solder on the inner assembling surface of the C/C radiating fin and then assembling the TiZrNiCu paste solder with the Ti tube.
The invention discloses a vacuum brazing connection method of a C/C radiating fin and a Ti tube, which has the advantages that:
(1) the C/C composite material with high heat conductivity and low density is adopted to replace the traditional heat dissipation material and is connected with the Ti tube with low density and high specific strength, so that the structural lightweight and compactness required by the aerospace field are met.
(2) The connecting method of vacuum brazing can be used for welding under the condition of no pressure or small pressure, reduces the generation of residual stress in the welding process, and is very suitable for the connection of dissimilar materials.
(3). The TiZrNiCu brazing filler metal is selected, the melting point of the TiZrNiCu brazing filler metal is about 1123K, the brazing temperature is lower than the phase transition temperature of Ti, the TiZrNiCu brazing filler metal has lower connection temperature and better high-temperature mechanical property, and meanwhile, the Ti element in the brazing filler metal is homogeneous with a Ti pipe, so that the Ti-NiCu brazing filler metal is beneficial to wetting of a welding interface and element diffusion
(4) The TiC is added into the TiZrNiCu for modification, so that the thermal expansion coefficient of a brazing filler metal connecting layer is reduced, a section of thermal expansion coefficient gradient transition layer can be formed between two base metals, the generation of residual thermal stress in the welding process is effectively reduced, the deformation of the joint and the base metals is reduced, the bonding strength of the welding joint is improved, and the cracking tendency of a connecting piece is avoided.
(5) Simple process, safety, no pollution, low cost and high reliability.
Drawings
FIG. 1 is a schematic view showing the connection of the C/C fin and the Ti tube.
FIG. 2 is a scanning electron microscope image of the welded joint of the C/C heat dissipation fin and the Ti tube in example 1, which shows that the connection is good and the intermediate layer and the connection interface have no obvious defects.
Detailed description of the preferred embodiments
The present invention will be further illustrated with reference to specific examples, but the present invention is not limited to these examples.
Example 1
a. Pretreatment: polishing a Ti tube by using 800-granularity water sand paper, removing an oxide film, putting the Ti tube into acetone for ultrasonic cleaning for 30min, putting the Ti tube into deionized water for ultrasonic cleaning for 10min, and putting the Ti tube into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the particle size of 3-5 mu m in percentage by mass of 3% into a ball milling tank, adding 20% of alcohol, carrying out ball milling for 18h, wherein the ball-to-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven, drying the ball milled powder, sieving the ball milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the powder into paste solder;
c. assembling: pre-assembling a C/C pipe and a Ti pipe, leaving a proper gap space, filling the prepared TiZrNiCu paste brazing filler metal into the gap by using a blowing ball, clamping an assembly part by using a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: starting the vacuum furnace to heat, the vacuum degree is 1X 10-3Pa, the heating rate is 5 ℃/min, and the temperature is kept for 10min after being increased to 920 ℃;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
And performing performance test on the obtained connecting piece, wherein the shear strength of the welding joint of the C/C radiating fin and the Ti pipe at room temperature is 33.7 MPa.
Example 2
a. Pretreatment: polishing a Ti tube by using 1000-granularity water sand paper, removing an oxide film, putting the Ti tube into acetone for ultrasonic cleaning for 30min, putting the Ti tube into deionized water for ultrasonic cleaning for 10min, and putting the Ti tube into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the particle size of 3-5 mu m in percentage by mass of 3% into a ball milling tank, adding 20% of alcohol, carrying out ball milling for 15 hours, wherein the ball-to-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven, drying the ball milled powder, sieving the ball milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the powder into paste solder;
c. assembling: pre-assembling a C/C pipe and a Ti pipe, leaving a proper gap space, filling the prepared TiZrNiCu paste brazing filler metal into the gap by using a blowing ball, clamping an assembly part by using a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: starting the vacuum furnace to heat, the vacuum degree is 1X 10-3Pa, the heating rate is 4 ℃/min, and the temperature is kept for 15min after being increased to 920 ℃;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
And performing performance test on the obtained connecting piece, wherein the shear strength of the welding joint of the C/C radiating fin and the Ti pipe at room temperature is 32.9 MPa.
Example 3
a. Pretreatment: polishing a Ti tube by 1500-granularity water sand paper, removing an oxide film, putting the Ti tube into acetone for ultrasonic cleaning for 30min, putting the Ti tube into deionized water for ultrasonic cleaning for 10min, and putting the Ti tube into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the granularity of 3-5 mu m accounting for 5% by mass into a ball milling tank, adding 20% alcohol, carrying out ball milling for 18h, wherein the ball-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven, drying the ball milled powder, sieving the ball milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the mixture to form paste solder;
c. assembling: soaking the processed Ti tube in TiZrNiCu paste solder, assembling with a C/C radiating fin after the surface is fully coated with the solder, clamping an assembly part by a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: vacuum degree of the vacuum furnace is not lower than 2 multiplied by 10-3Starting a vacuum furnace to heat after Pa, wherein the heating rate is 7 ℃/min, and the temperature is kept for 10min after being increased to 920 ℃;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
And performing performance test on the obtained connecting piece, wherein the shear strength of the welding joint of the C/C radiating fin and the Ti pipe at room temperature is 34.5 MPa.
Example 4
a. Pretreatment: polishing a Ti tube by using 1200-granularity water sand paper, removing an oxide film, putting the Ti tube into acetone for ultrasonic cleaning for 30min, putting the Ti tube into deionized water for ultrasonic cleaning for 10min, and putting the Ti tube into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the granularity of 3-5 mu m and the mass percentage of 4% into a ball milling tank, adding 20% of alcohol, carrying out ball milling for 16h, wherein the ball-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven, drying the ball milled powder, sieving the ball milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the mixture to form paste solder;
c. assembling: soaking the processed Ti tube in TiZrNiCu paste solder, assembling with a C/C radiating fin after the surface is fully coated with the solder, clamping an assembly part by a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: vacuum degree of the vacuum furnace is not less than 1 x 10-3Starting a vacuum furnace to heat after Pa, wherein the heating rate is 6 ℃/min, and the temperature is kept for 15min after being increased to 920 ℃;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
And performing performance test on the obtained connecting piece, wherein the shear strength of the welding joint of the C/C radiating fin and the Ti pipe at room temperature is 32.4 MPa.
Example 5
a. Pretreatment: polishing a Ti tube by using 800-granularity water sand paper, removing an oxide film, putting the Ti tube into acetone for ultrasonic cleaning for 30min, putting the Ti tube into deionized water for ultrasonic cleaning for 10min, and putting the Ti tube into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the granularity of 3-5 mu m and the mass percentage of 4% into a ball milling tank, adding 20% of alcohol, carrying out ball milling for 18h, wherein the ball-material ratio is 3:1, placing the ball-milled powder into a vacuum drying oven, drying the ball-milled powder, sieving the ball-milled powder by using a 60-mesh sieve, adding 10% of oily binder into the sieved powder, and stirring the mixture to form paste solder;
c. assembling: uniformly brushing the TiZrNiCu paste solder on the inner assembling surface of the C/C radiating fin by using a slender rolling brush, assembling the TiZrNiCu paste solder with a Ti tube, clamping an assembly part by using a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: vacuum degree of the vacuum furnace is not lower than 2 multiplied by 10-3Starting a vacuum furnace to heat after Pa, wherein the heating rate is 4 ℃/min, and the temperature is kept for 20min after being increased to 920 ℃;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
And performing performance test on the obtained connecting piece, wherein the shear strength of the welding joint of the C/C radiating fin and the Ti pipe at room temperature is 34.1 MPa.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. A vacuum brazing connection method of a C/C radiating fin and a Ti tube is characterized by comprising the following steps:
a. pretreatment: polishing a Ti pipe by using water sand paper with the granularity of being smaller than 800 to remove an oxide film, putting the Ti pipe into acetone for ultrasonic cleaning for 30min, putting the Ti pipe into deionized water for ultrasonic cleaning for 10min, and putting the Ti pipe into a vacuum drying oven for drying;
b. modification of the brazing filler metal: adding commercial TiZrNiCu alloy powder of-200 meshes and TiC powder with the particle size of 3-5 mu m into a ball milling tank, adding 20% alcohol, ball milling for 15-18h, wherein the ball-material ratio is 3:1, placing the ball milled powder into a vacuum drying oven, drying the ball milled powder, sieving the ball milled powder by using a 60-mesh sieve, adding an oily binder into the sieved powder, and stirring the powder into paste solder;
c. assembling: filling TiZrNiCu paste solder between the connection surfaces of the C/C radiating fins and the ground Ti tube, assembling, clamping an assembly part by a graphite clamp to prevent sliding, and then placing the assembly part in a vacuum furnace;
d. brazing: starting the vacuum furnace to heat, the vacuum degree is not less than 1 × 10-3Pa, the heating rate is 4-7 ℃/min, the temperature is increased to 920 ℃, and then the temperature is kept for 10-20 min;
e. and finally, cooling the furnace to room temperature to obtain a welded sample piece, and completing the connection of the C/C radiating fins and the Ti tube.
2. The vacuum brazing method for joining a C/C heat dissipating fin and a Ti tube as claimed in claim 1, wherein the TiC powder is added in the step b in an amount of 3-5% by mass.
3. The vacuum brazing method for joining a C/C fin and a Ti tube as set forth in claim 1, wherein the oily binder is added in the step b in an amount of 8 to 10% by mass.
4. The vacuum brazing connection method of a C/C radiating fin and a Ti tube according to claim 1, wherein the filling method of the brazing filler metal in the step C is one of a grouting method, a soaking method and a brushing method; wherein, the grouting method is to preassemble a C/C pipe and a Ti pipe and leave a proper gap space, and then to fill the prepared TiZrNiCu paste solder into the gap by blowing balls; the soaking method is that the processed Ti tube is soaked in the TiZrNiCu paste solder, and the Ti tube is assembled with the C/C radiating fin after the surface of the Ti tube is covered with the solder; the brush coating method is that a slender roller brush is used for uniformly brushing the TiZrNiCu paste solder on the inner assembling surface of the C/C radiating fin, and then the TiZrNiCu paste solder is assembled with a Ti tube.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892164A (en) * | 2022-05-19 | 2022-08-12 | 湘潭大学 | Preparation method of porous membrane on inner wall of stainless steel heat pipe |
| CN115162824A (en) * | 2022-09-07 | 2022-10-11 | 中化二建集团有限公司 | Installation and construction method of carbonization tower |
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