CN111872508B - Diffusion brazing connection method for honeycomb structure - Google Patents
Diffusion brazing connection method for honeycomb structure Download PDFInfo
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- CN111872508B CN111872508B CN202010581738.7A CN202010581738A CN111872508B CN 111872508 B CN111872508 B CN 111872508B CN 202010581738 A CN202010581738 A CN 202010581738A CN 111872508 B CN111872508 B CN 111872508B
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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
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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
- B23K3/08—Auxiliary devices therefor
Abstract
The invention relates to a honeycomb structure diffusion brazing connection method, belonging to the technical field of welding; step one, arranging a framework at the horizontal circumferential side wall of the honeycomb core; step two, after a middle layer is preset on the upper surface of the lower skin, the lower skin is attached to the bottom of the honeycomb core; after the middle layer is preset on the lower surface of the upper skin, attaching the upper skin to the top of the honeycomb core; placing on the lower graphite mold, and placing the upper graphite mold on top; thirdly, presetting a pressing block at the top of the upper graphite mold; forming a workpiece; step four, uniformly arranging the n graphite clamping blocks on the side wall of the workpiece; the circumferential edge of the workpiece is clamped; fifthly, heating and cooling the clamping tool to obtain a honeycomb structure after diffusion brazing; the invention has higher welding quality, and is particularly suitable for high-temperature alloy honeycomb structural products with complex profiles and higher requirements on mechanical property and forming precision.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a diffusion brazing connection method for a honeycomb structure.
Background
With the development of the aerospace industry, structures have put higher demands on light weight and functionality. The honeycomb member obtained by the traditional brazing method has the problems of low weld strength, easy corrosion of brazing filler metal and the like, and the honeycomb member with a complex profile has the problems of difficult tool pressing, poor forming precision after welding and the like. Transient liquid phase diffusion bonding, also called diffusion brazing, is heated to above the element eutectic temperature under the condition that a welding interface is in close contact, a eutectic liquid phase is formed at the contact interface by means of mutual diffusion among material atoms, the eutectic liquid phase is used as a filling material, is wetted and spread in the whole joint gap under the action of pressure, and is gradually solidified through diffusion between a liquid phase and a solid phase in the subsequent heat preservation process to form metallurgical bonding, so that the reliable bonding process is realized.
Although the use of transient liquid phase diffusion bonding can improve weld strength, it has not been well adapted for use with less rigid structures such as honeycombs, primarily because of the control of the welding pressure. Although the welding rate can be improved by applying welding pressure, and the strength of the welding seam is increased, the welding precision of the component is deteriorated, even the honeycomb is collapsed, and the strength and the forming precision of the welding seam cannot be effectively controlled.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the honeycomb structure diffusion brazing connection method is provided, the problems of low direct brazing strength, high corrosion degree and the like of the honeycomb structure are solved, and the problems of difficult pressure control, poor profile precision and the like of the diffusion brazing process are solved. The strength of the welding seam is superior to that of common brazing, the welding quality is higher than that of a screw clamping mode of a traditional brazing tool, and the high-temperature alloy honeycomb structural product is particularly suitable for high-temperature alloy honeycomb structural products with complex profiles and high requirements on mechanical property and forming precision.
The technical scheme of the invention is as follows:
a honeycomb structure diffusion brazing connection method comprises the following steps:
placing honeycomb holes of a honeycomb core along the vertical direction; arranging a framework at the horizontal circumferential side wall of the honeycomb core;
step two, preparing 1 upper skin and 1 lower skin; after a middle layer is preset on the upper surface of the lower skin, attaching the lower skin to the bottom of the honeycomb core; after the middle layer is preset on the lower surface of the upper skin, attaching the upper skin to the top of the honeycomb core; placing the honeycomb core attached with the upper skin and the lower skin on a lower graphite mold, and placing an upper graphite mold on the top of the honeycomb core; the shape of the lower graphite mold is completely attached to the lower skin; the shape of the upper graphite mould is completely fit with the upper skin;
Thirdly, presetting a pressing block at the top of the upper graphite mould, and downwards compressing the honeycomb core until the distance between the upper skin and the top of the framework is L1; forming a workpiece;
step four, uniformly arranging the n graphite clamping blocks on the side wall of the workpiece; the circumferential edge of the workpiece is clamped; n is a positive integer, and n is more than or equal to 8 and less than or equal to 12; the pressing block is disassembled to form a clamping tool;
fifthly, placing the clamping tool in a vacuum furnace, vacuumizing to P1, heating to a temperature of T1, and then preserving heat for a time of T1; and (5) after cooling to the temperature T2, keeping the temperature for T2 time, cooling to the room temperature along with the furnace, and then taking out to obtain the honeycomb structure after diffusion brazing.
In the above diffusion brazing connection method for a honeycomb structure, in the first step, the framework is a vertically-placed frame structure; the framework is attached along the circumferential direction of the honeycomb core; the shape of the framework corresponds to the shape of the side wall of the honeycomb core; and the top of the honeycomb core is exposed out of the framework; the top of the honeycomb core is 0.01-0.05 mm higher than the top of the framework.
In the above diffusion brazing connection method for the honeycomb structure, in the second step, the shape of the upper skin is consistent with the shapes of the tops of the honeycomb core and the framework; the shape of the lower skin is consistent with the bottom shapes of the honeycomb core and the framework.
In the above diffusion brazing connection method for a honeycomb structure, in the second step, the preparation method for the intermediate layer comprises:
presetting a middle layer on the upper surface of the lower skin by adopting a magnetron sputtering method, and presetting a middle layer on the lower surface of the upper skin; the thickness of the intermediate layer is 0.02-0.05 mm.
In the above diffusion brazing connection method for a honeycomb structure, in the third step, the weight of the pressing block is 100-300 kg; l1 is 0.1-0.3 mm.
In the above diffusion brazing connection method for a honeycomb structure, in the fourth step, the graphite clamping block is a C-shaped structure; 1 cushion block and 1 gasket are arranged between each graphite clamping block and the upper surface of the workpiece; the gasket is arranged on the upper surface of the workpiece; the cushion block is arranged on the upper surface of the gasket; and the upper surface of the cushion block is contacted with the lower surface of the top of the graphite clamping block.
In the diffusion brazing connection method for the honeycomb structure, the cushion block is of a hollow-middle square-shaped structure, and the top of the graphite clamping block is placed on the upper edge of the hollow part of the cushion block to realize deformation of the cushion block.
In the above-mentioned honeycomb structureIn the fifth step, P1 is 10 -3 Pa; the temperature T1 is 30-50 ℃ higher than the melting point of the middle layer; t1 is 10-20 min; the temperature T2 is 10-30 ℃ lower than the melting point of the middle layer; t2 is 1-3 h.
In the above diffusion brazing connection method for a honeycomb structure, in the fifth step, the expansion coefficients of the honeycomb core and the cushion block are larger than the expansion coefficient of graphite; in the heating process, the deformation of the honeycomb core and the cushion block is larger than that of the upper graphite mold, the lower graphite mold and the graphite clamping block; generating a compressive stress F between the upper graphite mold and the lower graphite mold; after the intermediate layer is melted, a liquid film filling gap is formed between the honeycomb and the upper skin; and then the temperature is reduced for a long time, and the temperature and pressure are kept for a long time, so that a uniform diffusion tissue is formed.
In the above diffusion brazing method for joining a honeycomb structure, the expansion coefficient of the honeycomb core and the frame is 12 × 10 -6 -13×10 -6 /° c; the cushion block is made of stainless steel material and has an expansion coefficient of 15 multiplied by 10 -6 -17×10 -6 /° c; the expansion coefficients of the upper graphite mold, the lower graphite mold and the graphite clamping block are 1 multiplied by 10 -6 -2×10 -6 /° c; f is 3-10T; the cushion block releases partial stress through deformation, and workpiece deformation and graphite clamp block fracture caused by overlarge expansion pressure are prevented.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the expansion coefficients of the workpiece and the cushion block are larger than that of graphite, the deformation of the graphite clamping block 7 is smaller than that of a tool in the temperature rising process, and the compressive stress is generated between the upper die and the lower die, so that the skin is enabled to be tightly attached to the honeycomb core and the framework. After the melting temperature of the intermediate layer is reached, a liquid film is formed between the honeycomb and the skin to fill a gap, the pressure reaches the maximum at the moment, and then the temperature is reduced for a long time for heat preservation and pressure maintaining to form a uniform diffusion structure, so that the aims of improving the mechanical property of a welding line and reducing the corrosion of parent metal are fulfilled;
(2) The invention adopts the double-square stainless steel cushion block, can release partial stress through deformation under the extremely high pressure, and prevents the problems of workpiece deformation and clamp block fracture caused by overlarge expansion pressure. The implementation method does not need an external pressure device, can carry out a diffusion bonding process with certain pressure in a common vacuum furnace, and can adjust the assembly gap through the weight of a pressing block to realize the control of welding pressure;
(3) the pressure generated by the invention not only meets the requirement of diffusion brazing, but also can not cause the honeycomb to deform obviously, such as collapse and the like, so that the forming precision of the honeycomb structure after welding is high. The intermediate layer is preset by magnetron sputtering, so that the operation of solder arrangement is simplified, and the product consistency is good.
(4) The invention solves the problems of low strength, large corrosion degree and the like of direct brazing of the honeycomb structure, and simultaneously solves the problems of difficult pressure control, poor profile precision and the like of the diffusion brazing process; the strength of the welding seam is superior to that of common brazing, the welding quality is higher than that of a traditional brazing tool screw clamping mode, and the high-temperature alloy honeycomb structural brazing tool is particularly suitable for high-temperature alloy honeycomb structural products with complex profiles and high requirements on mechanical performance and forming precision.
Drawings
FIG. 1 is a schematic view of a honeycomb diffusion brazing process of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a diffusion brazing connection method for a honeycomb structure, which is characterized in that a middle layer 4 is preset on the surfaces to be welded of an upper skin 21, a lower skin 22, a framework 3 and a honeycomb core 1, and after assembly, expansion stress is obtained through the temperature rise process of a graphite tool to perform diffusion brazing connection. Firstly, an interlayer is preset on a surface to be welded by adopting a magnetron sputtering method, after assembly, a graphite tool is combined with flexible clamping, and clamping force is obtained by utilizing the fact that the expansion of a workpiece and a clamping block is larger than that of the tool at high temperature so as to achieve tight fit, thereby controlling the connection precision of diffusion brazing. The invention solves the problems of low strength, large corrosion degree and the like of direct brazing of the honeycomb structure, simultaneously solves the problems of difficult pressure control, poor profile precision and the like of the diffusion brazing process, and is particularly suitable for high-temperature alloy honeycomb structure products with complex profiles and higher requirements on mechanical property and forming precision.
The main flow of the honeycomb structure diffusion brazing connection method is as follows: a middle layer 4 is preset on the surfaces to be welded of the skin, the framework 3 and the honeycomb core 1, and after assembly, expansion stress is obtained through the temperature rise process of a graphite tool for diffusion brazing connection. Firstly, an interlayer 4 is preset on a surface to be welded by adopting a magnetron sputtering method, and after assembly, a graphite tool is combined with flexible clamping, and clamping force is obtained by utilizing the fact that the expansion of a workpiece and a clamping block is larger than that of the tool at high temperature so as to achieve tight fit, thereby controlling the connection precision of diffusion brazing. The invention solves the problems of low strength, large corrosion degree and the like of direct brazing of the honeycomb structure, simultaneously solves the problems of difficult pressure control, poor profile precision and the like of the diffusion brazing process, and is particularly suitable for high-temperature alloy honeycomb structure products with complex profiles and higher requirements on mechanical property and forming precision.
As shown in fig. 1, the method specifically comprises the following steps:
selecting a honeycomb core 1 to be processed, and placing honeycomb holes of the honeycomb core 1 in the vertical direction; a skeleton 3 is provided at the horizontal circumferential side wall of the honeycomb core 1. The framework 3 is a vertically placed framework structure; the framework 3 is attached along the circumferential direction of the honeycomb core 1. In actual assembly, the frame 3 may be a ring structure, and completely covers the circumferential side wall of the honeycomb core 1. It may be a plurality of rod-like structures supporting the outer wall at the junction of each adjacent face of the polygonal honeycomb core 1. The shape of the framework 3 corresponds to the shape of the side wall of the honeycomb core 1; and the top of the honeycomb core 1 is exposed out of the framework 3; the top of the honeycomb core 1 is 0.01-0.05 mm higher than the top of the framework 3, and a space for pre-pressing a pressing block behind for compression is reserved.
Step two, preparing 1 upper skin 21 according to the molded surface of the upper surface of the honeycomb core 1 in advance; preparing 1 lower skin 22 according to the profile of the lower surface; after a middle layer 4 is preset on the upper surface of the lower skin 22, the lower skin 22 is attached to the bottom of the honeycomb core 1; after the middle layer 4 is preset on the lower surface of the upper skin 21, the honeycomb core and the upper and lower two groups of skins are assembled. The preparation method of the intermediate layer 4 is to preset a layer of the intermediate layer 4 on the upper surface of the lower skin 22 by adopting a magnetron sputtering method. The intermediate layer is preset by a magnetron sputtering method, so that the operation of solder arrangement is simplified, and the consistency of products is good. When 2 skins are assembled, attaching an upper skin 21 to the top of the honeycomb core 1; a middle layer 4 is arranged on the lower surface of the upper skin 21 in advance; the thickness of the middle layer 4 is 0.02-0.05 mm. The shape of the upper skin 21 is consistent with the top shapes of the honeycomb core 1 and the framework 3; the shape of the lower skin 22 conforms to the bottom shape of the honeycomb core 1 and the skeleton 3. Placing the honeycomb core 1 to which the upper skin 21 and the lower skin 22 are attached on the lower graphite mold 6, and placing the upper graphite mold 5 on top of the honeycomb core 1; the shape of the lower graphite mould 6 is completely attached to the lower skin 22; the upper graphite mold 5 is shaped to completely conform to the upper skin 21. The shape and size of the upper graphite mould and the lower graphite mould are prepared in advance according to the molded surface of the honeycomb core 1, and the uniform deformation is ensured in the subsequent heating process.
And step three, after the upper graphite mold 5 is assembled, presetting a pressing block at the top of the upper graphite mold 5 to realize presetting compression force on the upper skin 21. Compressing the honeycomb core 1 downwards by a pressing block until the distance between the upper skin 21 and the top of the framework 3 is 0.1-0.3mm, and forming a workpiece; according to the elastic modulus of the honeycomb core 1 material, the weight of a pressing block is selected to be 100-300kg, so that the distance between the upper skin 21 and the top of the framework 3 is controlled to be 0.1-0.3mm, and preparation is made for subsequent thermal stress deformation.
Step four, after the upper graphite mold and the lower graphite mold are assembled, uniformly arranging the n graphite clamping blocks 7 on the side wall of the workpiece; the circumferential edge of the workpiece is clamped; n is a positive integer, and n is more than or equal to 8 and less than or equal to 12; the pressing block is disassembled to form a clamping tool; the graphite clamping block 7 is of a C-shaped structure; 1 cushion block 8 and 1 gasket 9 are arranged between each graphite clamping block 7 and the upper surface of the workpiece; the pad 9 is arranged on the upper surface of the workpiece; the cushion block 8 is arranged on the upper surface of the gasket 9; and the upper surface of the cushion block 8 is contacted with the lower surface of the top of the graphite clamping block 7. The cushion block 8 is of a hollow square-shaped structure, the top of the graphite clamping block 7 is placed on the upper edge of the hollow part of the cushion block 8, and deformation of the cushion block 8 is achieved. The adopted square-shaped stainless steel cushion block 8 can release partial stress through deformation under great pressure, and the problems of workpiece deformation and clamp block fracture caused by overlarge expansion pressure are prevented. The implementation method does not need an external pressure device, can carry out a diffusion bonding process with certain pressure in a common vacuum furnace, and can adjust the assembly clearance through the weight of the pressing block to realize the control of welding pressure.
Step five, placing the clamping tool in a vacuum furnace, vacuumizing to P1, and heating to the temperature T1Keeping the temperature for t1 time; and (5) after cooling to the temperature T2, keeping the temperature for T2 time, cooling to the room temperature along with the furnace, and then taking out to obtain the honeycomb structure after diffusion brazing. P1 is 10 -3 Pa; the temperature T1 is 30-50 ℃ higher than the melting point of the middle layer 4; t1 is 10-20 min; the temperature T2 is 10-30 ℃ lower than the melting point of the middle layer 4; t2 is 1-3 h. The expansion coefficients of the honeycomb core 1 and the cushion block 8 are larger than that of graphite; the expansion coefficients of the workpiece and the cushion block are larger than that of graphite, the deformation of the graphite clamping block 7 is smaller than that of a tool in the temperature rising process, and the compression stress is generated between the upper die and the lower die, so that the skin is tightly attached to the honeycomb core and the framework. After the melting temperature of the intermediate layer is reached, a liquid film is formed between the honeycomb and the skin to fill a gap, the pressure reaches the maximum at the moment, and then the temperature is reduced for a long time for heat preservation and pressure maintaining to form a uniform diffusion structure, so that the aims of improving the mechanical property of a welding line and reducing the corrosion of parent metal are fulfilled; in the heating process, the deformation of the honeycomb core 1 and the cushion block 8 is larger than that of the upper graphite mold 5, the lower graphite mold 6 and the graphite clamping block 7; a compressive stress F is generated between the upper graphite mold 5 and the lower graphite mold 6; after the intermediate layer 4 is melted, a liquid film filling gap is formed between the honeycomb 1 and the upper skin 21; and then the temperature is reduced for a long time, and the temperature and pressure are kept for a long time, so that a uniform diffusion tissue is formed. The expansion coefficient of the honeycomb core 1 and the skeleton 3 is 12 x 10 -6 -13×10 -6 /° c; the cushion block 8 is made of stainless steel material and has an expansion coefficient of 15 multiplied by 10 -6 -17×10 -6 /° c; the expansion coefficients of the upper graphite mold 5, the lower graphite mold 6 and the graphite clamping block 7 are 1 multiplied by 10 -6 -2×10 -6 /° c; f is 3-10T; the cushion block 8 releases partial stress through deformation, and prevents the workpiece from deforming and the graphite clamping block 7 from being broken due to overlarge expansion pressure.
By the diffusion brazing connection method designed by the application, the pressure generated in the process of inquiring is realized, the requirement of diffusion brazing is met, and the obvious collapse and other deformation of the honeycomb can not be caused, so that the forming precision of the welded honeycomb structure is high. The intermediate layer is preset by magnetron sputtering, so that the operation of solder arrangement is simplified, and the product consistency is good. The problems of low direct brazing strength, high corrosion degree and the like of the honeycomb structure are solved, and the problems of difficult pressure control, poor profile precision and the like of a diffusion brazing process are solved; the strength of the welding seam is superior to that of common brazing, the welding quality is higher than that of a screw clamping mode of a traditional brazing tool, and the high-temperature alloy honeycomb structural product is particularly suitable for high-temperature alloy honeycomb structural products with complex profiles and high requirements on mechanical property and forming precision.
Example 1
Polishing and cleaning the surfaces to be welded of the skins, the framework and the honeycomb core, presetting a middle layer with the thickness of 0.02mm by a magnetron sputtering method, and assembling the honeycomb core and the upper and lower groups of skins, wherein the height dimension of the honeycomb core is 0.01mm larger than that of the surrounding framework. After the assembly part is placed into a graphite mold, 100Kg of pressing blocks are placed above the graphite mold, after the gap between a workpiece skin and a framework is controlled to be 0.3mm, 8 groups of C-shaped graphite clamping blocks are uniformly arranged around the tool and used for clamping the graphite mold, and a back-shaped cushion block is placed at the contact part of the clamping blocks and the mold. And filling a metal gasket in the residual gap between the cushion block and the die until the cushion block and the die are tightly matched. Placing the assembled mould and workpiece in a vacuum furnace, and vacuumizing to 10 DEG -3 And (3) heating after Pa, preserving the heat for 10min after the temperature rises to be 30 ℃ above the melting point of the intermediate layer, cooling, continuing preserving the heat for 1h after the temperature is reduced to be 10 ℃ below the melting point of the intermediate layer, carrying out isothermal diffusion, and cooling to room temperature along with the furnace after the heat preservation is finished to obtain the honeycomb member.
Example 2
Polishing and cleaning the surfaces to be welded of the skins, the framework and the honeycomb core, presetting a middle layer with the thickness of 0.03mm by a magnetron sputtering method, and assembling the honeycomb core and the upper and lower groups of skins, wherein the height dimension of the honeycomb core is 0.02mm larger than that of the surrounding framework. After the assembly part is placed into a graphite mold, 200Kg of pressing blocks are placed above the graphite mold, after the gap between a workpiece skin and a framework is controlled to be 0.2mm, 10 groups of C-shaped graphite clamping blocks are uniformly arranged around the tool and used for clamping the graphite mold, and a back-shaped cushion block is placed at the contact part of the clamping blocks and the mold. And filling a metal gasket in the residual gap between the cushion block and the die until the cushion block and the die are tightly matched. Placing the assembled mould and workpiece in a vacuum furnace, and vacuumizing to 10 DEG -3 And (3) heating after Pa, preserving the heat for 15min after the temperature rises to 40 ℃ above the melting point of the intermediate layer, cooling, continuing preserving the heat for 2h for isothermal diffusion after the temperature is reduced to 20 ℃ below the melting point of the intermediate layer, and cooling to room temperature along with the furnace after the heat preservation is finished to obtain the honeycomb member.
Example 3
Polishing and cleaning the surfaces to be welded of the skins, the framework and the honeycomb core, presetting a middle layer with the thickness of 0.04mm by a magnetron sputtering method, assembling the honeycomb core and the upper and lower groups of skins, wherein the height dimension of the honeycomb core is 0.03mm larger than that of the surrounding framework. After the assembly part is placed into a graphite mold, 250Kg of pressing blocks are placed above the graphite mold, after the gap between a workpiece skin and a framework is controlled to be 0.15mm, 10 groups of C-shaped graphite clamping blocks are uniformly arranged around the tool and used for clamping the graphite mold, and a back-shaped cushion block is placed at the contact part of the clamping blocks and the mold. And filling a metal gasket in the residual gap between the cushion block and the die until the metal gasket is tightly matched. Placing the assembled mould and workpiece in a vacuum furnace, and vacuumizing to 10 DEG -3 And (3) heating after Pa, preserving the heat for 15min after the temperature rises to 40 ℃ above the melting point of the intermediate layer, cooling, continuing preserving the heat for 2h for isothermal diffusion after the temperature is reduced to 20 ℃ below the melting point of the intermediate layer, and cooling to room temperature along with the furnace after the heat preservation is finished to obtain the honeycomb member.
Example 4
Polishing and cleaning the surfaces to be welded of the skins, the framework and the honeycomb core, presetting a middle layer with the thickness of 0.05mm by a magnetron sputtering method, and assembling the honeycomb core and the upper and lower groups of skins, wherein the height dimension of the honeycomb core is 0.05mm larger than that of the surrounding framework. After the assembly part is placed into a graphite mold, 300Kg of pressing blocks are placed above the graphite mold, after the gap between a workpiece skin and a framework is controlled to be 0.1mm, 12 groups of C-shaped graphite clamping blocks are uniformly arranged around the tool and used for clamping the graphite mold, and a back-shaped cushion block is placed at the contact part of the clamping blocks and the mold. And filling a metal gasket in the residual gap between the cushion block and the die until the cushion block and the die are tightly matched. Placing the assembled mould and workpiece in a vacuum furnace, and vacuumizing to 10 DEG -3 And (3) heating after Pa, preserving the heat for 20min after the temperature rises to be 50 ℃ above the melting point of the intermediate layer, cooling, continuing preserving the heat for 3h after the temperature is reduced to be 30 ℃ below the melting point of the intermediate layer, carrying out isothermal diffusion, and cooling to room temperature along with the furnace after the heat preservation is finished to obtain the honeycomb member.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. A honeycomb structure diffusion brazing connection method is characterized in that: the method comprises the following steps:
placing honeycomb holes of a honeycomb core (1) along a vertical direction; arranging a framework (3) at the horizontal circumferential side wall of the honeycomb core (1);
step two, preparing 1 upper skin (21) and 1 lower skin (22); after a middle layer (4) is preset on the upper surface of the lower skin (22), the lower skin (22) is attached to the bottom of the honeycomb core (1); after a middle layer (4) is preset on the lower surface of the upper skin (21), the upper skin (21) is attached to the top of the honeycomb core (1); placing the honeycomb core (1) attached with the upper skin (21) and the lower skin (22) on a lower graphite mold (6), and placing an upper graphite mold (5) on the top of the honeycomb core (1); the shape of the lower graphite mould (6) is completely attached to the lower skin (22); the shape of the upper graphite mould (5) is completely attached to the upper skin (21); presetting an intermediate layer (4) by adopting magnetron sputtering;
Thirdly, presetting a pressing block at the top of the upper graphite mold (5), and downwards compressing the honeycomb core (1) until the distance between the upper skin (21) and the top of the framework (3) is L1; forming a workpiece; the weight of the briquette is 100-300 kg; l1 is 0.1-0.3 mm;
step four, uniformly arranging n graphite clamping blocks (7) on the side wall of the workpiece; the circumferential edge of the workpiece is clamped; n is a positive integer, and n is more than or equal to 8 and less than or equal to 12; the pressing block is disassembled to form a clamping tool;
fifthly, placing the clamping tool in a vacuum furnace, vacuumizing to P1, heating to a temperature of T1, and then preserving heat for a time of T1; cooling to a temperature T2, preserving heat for a time T2, cooling to room temperature along with the furnace, and taking out to obtain a honeycomb structure after diffusion brazing; p1 is 10 -3 Pa; the temperature T1 is 30-50 ℃ higher than the melting point of the intermediate layer (4); t1 is 10-20 min; the temperature T2 is 10-30 ℃ lower than the melting point of the intermediate layer (4); t2 is 1-3 h.
2. A honeycomb diffusion brazing connection method according to claim 1, wherein: in the first step, the framework (3) is a vertically placed frame structure; the framework (3) is attached along the circumferential direction of the honeycomb core (1); the shape of the framework (3) corresponds to the shape of the side wall of the honeycomb core (1); the top of the honeycomb core (1) is exposed out of the framework (3); the top of the honeycomb core (1) is 0.01-0.05 mm higher than the top of the framework (3).
3. The honeycomb diffusion brazing connecting method according to claim 1, wherein: in the second step, the shape of the upper skin (21) is consistent with the top shapes of the honeycomb core (1) and the framework (3); the shape of the lower skin (22) is consistent with the bottom shapes of the honeycomb core (1) and the framework (3).
4. A honeycomb diffusion brazing connection method according to claim 3, wherein: in the second step, the preparation method of the intermediate layer (4) comprises the following steps:
a middle layer (4) is preset on the upper surface of the lower skin (22) by a magnetron sputtering method, and a middle layer (4) is preset on the lower surface of the upper skin (21); the thickness of the middle layer (4) is 0.02-0.05 mm.
5. The honeycomb diffusion brazing connecting method according to claim 4, wherein: in the fourth step, the graphite clamping block (7) is of a C-shaped structure; 1 cushion block (8) and 1 gasket (9) are arranged between each graphite clamping block (7) and the upper surface of the workpiece; the gasket (9) is arranged on the upper surface of the workpiece; the cushion block (8) is arranged on the upper surface of the gasket (9); and the upper surface of the cushion block (8) is contacted with the lower surface of the top of the graphite clamping block (7).
6. The honeycomb diffusion brazing connecting method according to claim 5, wherein: the cushion block (8) is of a hollow square-shaped structure, the top of the graphite clamping block (7) is placed on the upper edge of the hollow part of the cushion block (8), and deformation of the cushion block (8) is achieved.
7. The honeycomb diffusion brazing connecting method according to claim 6, wherein: in the fifth step, the expansion coefficients of the honeycomb core (1) and the cushion block (8) are larger than that of the graphite; in the heating process, the deformation of the honeycomb core (1) and the cushion block (8) is larger than that of the upper graphite mold (5), the lower graphite mold (6) and the graphite clamping block (7); generating a compressive stress F between the upper graphite mold (5) and the lower graphite mold (6); after the intermediate layer (4) is melted, a liquid film filling gap is formed between the honeycomb core (1) and the upper skin (21); and then the temperature is reduced for a long time, and the temperature and pressure are kept for a long time, so that a uniform diffusion tissue is formed.
8. A honeycomb diffusion brazing connection method according to claim 7, wherein: the expansion coefficient of the honeycomb core (1) and the framework (3) is 12 multiplied by 10 -6 -13×10 -6 /° c; the cushion block (8) is made of stainless steel material and has an expansion coefficient of 15 multiplied by 10 -6 -17×10 -6 /° c; the expansion coefficients of the upper graphite mold (5), the lower graphite mold (6) and the graphite clamping block (7) are 1 multiplied by 10 -6 -2×10 -6 /° c; f is 3-10T; the cushion block (8) releases partial stress through deformation, and prevents the workpiece from deforming and the graphite clamping block (7) from breaking due to overlarge expansion pressure.
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