CN113000960B - Method for connecting ceramic radome and metal connecting ring - Google Patents
Method for connecting ceramic radome and metal connecting ring Download PDFInfo
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- CN113000960B CN113000960B CN202110286972.1A CN202110286972A CN113000960B CN 113000960 B CN113000960 B CN 113000960B CN 202110286972 A CN202110286972 A CN 202110286972A CN 113000960 B CN113000960 B CN 113000960B
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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
- B23K1/008—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
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3006—Ag as the principal constituent
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
- B23K2103/52—Ceramics
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Abstract
A method for connecting a ceramic radome and a metal connecting ring relates to a method for connecting ceramic and metal. The invention aims to solve the technical problem that the existing porous silicon nitride ceramic/Invar alloy radome joint has high residual stress. According to the invention, the problem of high residual stress of the conventional porous silicon nitride ceramic/Invar alloy radome joint is solved through the structural design of the radome, so that no obvious microcrack exists after the annular radome is connected. The design of the middle connecting layer of the invention comprises an upper brazing filler metal layer, a soft middle layer and a lower brazing filler metal layer. Wherein the upper brazing filler metal is an AgCuTi brazing filler metal foil; the soft middle layer is made of Cu foam, Cu corrugated or foam nickel; the lower brazing filler metal is AgCu brazing filler metal foil. The invention is applied to the field of welding.
Description
Technical Field
The invention relates to a method for connecting ceramic and metal.
Background
The radome is an important structural part of the aircraft and needs to have the characteristics of excellent dielectric property, good thermal shock resistance, low thermal expansion coefficient and the like. Porous Si 3 N 4 Ceramic as antenna cover can meet the above requirements, however porous Si 3 N 4 The ceramic material is brittle and difficult to assemble directly with other parts of the aircraft, so a metal ring is required to be connected to the end of the radome, and the assembly with other parts of the aircraft is realized through the metal ring. In some patents, the radome and the metal ring are connected by organic glue, but the strength is low and the high temperature resistance is not good. Therefore, the strength and the high-temperature resistance of the connecting structure are greatly improved by adopting the ceramic-metal brazing technology. Invar alloys have the advantage of low thermal expansion coefficients and are therefore often chosen as metal bond rings. On one hand, the large-size structural part has large connecting area, and the residual stress rises sharply along with the increase of the size of the structural part, and on the other hand, the porous Si is used for the structural part 3 N 4 The ceramic is easy to break, and the brazing process is easy to cause porous Si due to overlarge residual stress 3 N 4 The ceramic breaks. Therefore, the structural design of the radome connecting part is required, and the residual stress of the connecting piece is reduced by optimizing the structure.
Disclosure of Invention
The invention provides a method for connecting a ceramic radome and a metal connecting ring, aiming at solving the technical problem of high residual stress of the joint of the porous silicon nitride ceramic/Invar alloy radome at present.
The method for connecting the ceramic radome and the metal connecting ring is carried out according to the following steps:
firstly, cleaning Invar alloy connecting rings by using absolute ethyl alcohol and acetone in sequence;
the center of the Invar alloy connecting ring is a through hole, the upper part of the Invar alloy connecting ring is of a hollow round table structure, and the diameter of the upper end is smaller than that of the lower end; the lower part of the Invar alloy connecting ring is of a hollow cylinder structure; the outer diameter of the bottom end of the upper part of the Invar alloy connecting ring is smaller than that of the lower part of the Invar alloy connecting ring;
II, mixing porous Si 3 N 4 The surface of the ceramic radome is wiped by cotton; said porous Si 3 N 4 The ceramic radome is of a hollow circular ring structure, and the shape of the inner wall of the ceramic radome is the same as that of the outer wall of the upper part of the Invar alloy connecting ring;
thirdly, processing the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into an annular structure with the same shape as the upper outer wall of the Invar alloy connecting ring, then putting the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into absolute ethyl alcohol, ultrasonically cleaning for 2-3 min, and putting the materials into an oven to dry;
the inner layer brazing filler metal is AgCu brazing filler metal foil;
the soft interlayer brazing filler metal is foam copper, Cu corrugated or foam nickel;
the outer brazing filler metal is AgCuTi brazing filler metal foil;
fourthly, sequentially sleeving an inner layer brazing filler metal, a soft middle layer and an outer layer brazing filler metal on the outer surface of the upper part of the Invar alloy connecting ring, gluing adjacent layers by using 502 glue, and then sleeving the outer wall of the upper layer brazing filler metal with porous Si 3 N 4 Ceramic skyThe wire cover is tightly matched among the layers;
fifthly, placing the workpiece to be welded assembled in the fourth step into a vacuum heating furnace, firstly heating the workpiece to be welded to 300-350 ℃ at the temperature of 10-15 ℃/min under the vacuum condition, and preserving the heat for 30-40 min at the temperature of 300-350 ℃; then heating up to 850-900 ℃ from 300-350 ℃ at a heating rate of 10-15 ℃/min, preserving the heat at 850-900 ℃ for 10-15 min, then cooling to 300-350 ℃ at 5-10 ℃/min, and then naturally cooling to room temperature to complete the brazing of the ceramic and the metal.
The corrugated structure has the characteristic of impact resistance, and the Cu simple substance has better ductility and plasticity, so the Cu corrugated structure has the advantages of better elasticity and plasticity. The corrugated structure can flexibly adjust the shape of the tooth profile, such as trapezoid, triangle, rectangle and the like, and can change the height of the tooth profile according to needs. The Cu corrugated structure can adapt to Invar alloy and Si through elastic deformation in the connection process 3 N 4 The change of the gap between the base materials caused by the difference of the thermal expansion coefficients of the ceramics can be relieved by the local plastic deformation of the Cu corrugated structure 3 N 4 Residual stress caused by the difference in the coefficient of thermal expansion of the ceramic.
The invention aims to design a connecting structure of a ceramic antenna housing, and the gradient composite intermediate layer is adopted to inhibit the residual stress of a ceramic metal brazing joint, so that the strength of the joint is improved, and the application of a large annular porous silicon nitride ceramic/Invar alloy antenna housing is realized.
The method is simple to operate, the direct brazing of the ceramic and the metal can be realized without performing any modification treatment on the surface of the sample to be welded before welding, the residual stress is relieved by adding the soft middle layer, the occurrence of micro cracks on a connecting interface is reduced, and the annular antenna housing is free from obvious micro cracks after being connected.
Drawings
FIG. 1 is a cross-sectional view of an Invar alloy interface ring of test one;
FIG. 2 is an assembled cross-sectional view of a part to be welded at step four of test one;
fig. 3 is a top view of a Cu corrugation of an embodiment eight;
fig. 4 is a top view of a Cu corrugation of a sixth embodiment;
fig. 5 is a top view of a Cu corrugation of embodiment seven;
FIG. 6 is a photograph of the joint tissue obtained in step five of experiment three;
FIG. 7 is an enlarged view of the box in FIG. 6;
FIG. 8 is an overall SEM image of the joint tissue obtained in step five of experiment five;
FIG. 9 is a first enlarged fragmentary view of FIG. 8;
FIG. 10 is a second enlarged partial view of FIG. 8;
fig. 11 is a third partial enlarged view of fig. 8.
Detailed Description
The first embodiment is as follows: the embodiment is a method for connecting a ceramic radome and a metal connecting ring, which is specifically carried out according to the following steps:
firstly, sequentially cleaning Invar alloy connecting rings by absolute ethyl alcohol and acetone to remove oil stains on the pre-welded surface;
the center of the Invar alloy connecting ring is a through hole, the upper part of the Invar alloy connecting ring is of a hollow round table structure, and the diameter of the upper end is smaller than that of the lower end; the lower part of the Invar alloy connecting ring is of a hollow cylinder structure; the outer diameter of the bottom end of the upper part of the Invar alloy connecting ring is smaller than that of the lower part of the Invar alloy connecting ring;
II, mixing porous Si 3 N 4 Wiping the surface of the ceramic radome by cotton to remove dust on the surface; said porous Si 3 N 4 The ceramic antenna housing is of a hollow circular ring structure, and the shape of the inner wall of the ceramic antenna housing is the same as that of the outer wall of the upper part of the Invar alloy connecting ring;
thirdly, processing the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into an annular structure with the same shape as the upper outer wall of the Invar alloy connecting ring, then putting the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into absolute ethyl alcohol, ultrasonically cleaning for 2-3 min, and putting the materials into an oven to dry;
the inner layer brazing filler metal is AgCu brazing filler metal foil;
the soft interlayer brazing filler metal is foam copper, Cu corrugated or foam nickel;
the outer brazing filler metal is AgCuTi brazing filler metal foil;
fourthly, sequentially sheathing an inner layer brazing filler metal, a soft middle layer and an outer layer brazing filler metal on the outer surface of the upper part of the Invar alloy connecting ring, gluing the adjacent layers by 502 glue, and then sheathing porous Si on the outer wall of the upper layer brazing filler metal 3 N 4 The ceramic antenna housing is tightly matched among all layers;
fifthly, placing the workpiece to be welded assembled in the fourth step into a vacuum heating furnace, firstly heating the workpiece to be welded to 300-350 ℃ at the temperature of 10-15 ℃/min under the vacuum condition, and preserving the heat for 30-40 min at the temperature of 300-350 ℃; then heating up to 850-900 ℃ from 300-350 ℃ at a heating rate of 10-15 ℃/min, preserving the heat at 850-900 ℃ for 10-15 min, then cooling to 300-350 ℃ at 5-10 ℃/min, and then naturally cooling to room temperature to complete the brazing of the ceramic and the metal.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: and step three, putting the mixture into an oven to be dried at 40 ℃. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the thickness of the inner brazing filler metal in the third step is 50-100 mu m. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the thickness of the soft brazing filler metal in the middle layer in the third step is 0.5 mm-5 mm. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the thickness of the outer brazing filler metal in the third step is 50-120 mu m. The rest is the same as in the fourth embodiment.
The sixth specific implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the tooth shapes of the Cu corrugations described in step three are arranged alternately in a trapezoidal shape and a triangular shape, as shown in fig. 4. The rest is the same as the fourth embodiment.
The seventh embodiment: the fourth difference between this embodiment and the specific embodiment is that: the tooth shape of the Cu flute described in step three is rectangular, as shown in fig. 5. The rest is the same as the fourth embodiment.
The specific implementation mode is eight: the fourth difference between this embodiment and the specific embodiment is that: the tooth form of the Cu corrugation described in step three is triangular, as shown in fig. 3. The rest is the same as the fourth embodiment.
The specific implementation method nine: the fourth difference between this embodiment and the specific embodiment is that: the tooth height of the Cu flute in the third step is 0.5 mm-2 mm. The rest is the same as the fourth embodiment.
The specific implementation mode is ten: the fourth difference between this embodiment and the specific embodiment is that: step five, putting the workpieces to be welded assembled in the step four into a vacuum heating furnace, and vacuumizing until the vacuum degree is 6 multiplied by 10 -3 Pa. The rest is the same as in the fourth embodiment.
The concrete implementation mode eleven: the fourth difference between the present embodiment and the specific embodiment is that: in the fifth step, under the vacuum condition, the temperature is firstly increased from room temperature to 300 ℃ at the speed of 10 ℃/min, and the temperature is kept for 30min at the temperature of 300 ℃; and then raising the temperature from 300 ℃ to 850 ℃ at a heating rate of 10 ℃/min, preserving the heat at 850 ℃ for 10min, then reducing the temperature to 300 ℃ at 5 ℃/min, and then naturally cooling to room temperature to finish the brazing of the ceramic and the metal. The rest is the same as the fourth embodiment.
The invention was verified with the following tests:
test one: the test is a method for connecting a ceramic radome and a metal connecting ring, which is carried out according to the following steps:
firstly, cleaning Invar alloy connecting rings by using absolute ethyl alcohol and acetone in sequence;
the center of the Invar alloy connecting ring 1 is a through hole 1-3, the upper part 1-2 of the Invar alloy connecting ring is of a hollow circular truncated cone structure, the diameter of the upper end is smaller than that of the lower end, and the included angle between the outer side wall of the circular truncated cone and the vertical direction is 3 degrees; the lower part 1-1 of the Invar alloy connecting ring is of a hollow cylinder structure; the outer diameter of the bottom end of the upper part 1-2 of the Invar alloy connecting ring is smaller than that of the lower part 1-1 of the Invar alloy connecting ring (shown in figure 1);
II, mixing porous Si 3 N 4 The surface of the ceramic radome is wiped by cotton; said porous Si 3 N 4 The ceramic radome is of a hollow circular ring structure, and the shape of the inner wall of the ceramic radome is the same as that of the outer wall of the upper part of the Invar alloy connecting ring;
thirdly, processing the inner-layer brazing filler metal, the soft middle-layer brazing filler metal and the outer-layer brazing filler metal into an annular structure with the same shape as the upper outer wall of the Invar alloy connecting ring, then placing the inner-layer brazing filler metal, the soft middle-layer brazing filler metal and the outer-layer brazing filler metal into absolute ethyl alcohol for ultrasonic cleaning for 2min, and placing the materials into a baking oven for drying at 40 ℃;
the inner-layer brazing filler metal is an AgCu brazing filler metal foil, specifically an Ag-28Cu brazing filler metal, the thickness is 100 micrometers, the mass fraction of Cu is 28%, and the balance is Ag;
the soft interlayer brazing filler metal is foam copper and the thickness of the soft interlayer brazing filler metal is 2 mm;
the outer-layer brazing filler metal is Ag-28Cu-3.5Ti brazing filler metal, specifically Ag-28Cu-3.5Ti brazing filler metal, the thickness of the outer-layer brazing filler metal is 100 micrometers, the mass fraction of Cu is 28%, the mass fraction of Ti is 3.5%, and the balance is Ag;
fourthly, sequentially sheathing an inner layer brazing filler metal, a soft middle layer and an outer layer brazing filler metal on the outer surface of the upper part of the Invar alloy connecting ring, gluing the adjacent layers by 502 glue, and then sheathing porous Si on the outer wall of the upper layer brazing filler metal 3 N 4 The ceramic antenna housing is tightly matched with each layer;
fifthly, putting the workpieces to be welded assembled in the fourth step into a vacuum heating furnace, and vacuumizing until the vacuum degree is 6 multiplied by 10 - 3 Pa, firstly heating the temperature from room temperature to 300 ℃ at the speed of 10 ℃/min, and preserving the temperature for 30min at 300 ℃; and then raising the temperature from 300 ℃ to 850 ℃ at a heating rate of 10 ℃/min, preserving the heat at 850 ℃ for 10min, then reducing the temperature to 300 ℃ at 5 ℃/min, and then naturally cooling to room temperature to finish the brazing of the ceramic and the metal.
FIG. 2 is an assembled cross-sectional view of the work piece to be welded at step four of test one, where 1 is Invar alloy, 2 is AgCu braze, 3 is copper foam, 4 is AgCuTi braze, and 5 is porous silicon nitride ceramic.
And (2) test II: the test is a method for connecting a ceramic radome and a metal connecting ring, which is carried out according to the following steps: this test differs from the test one in that: the soft brazing filler metal in the third step is a Cu corrugated layer, the tooth height is 1mm, and the tooth shapes are alternately arranged in a trapezoidal shape and a triangular shape, as shown in figure 4. The rest is the same as test one.
And (3) test III: the test is a method for connecting a ceramic antenna housing and a metal connecting ring, which is carried out according to the following steps: this test differs from the test one in that: the soft brazing filler metal in the third step is a Cu corrugated layer, the tooth height is 2mm, and the tooth shape is rectangular, as shown in fig. 5. The rest is the same as test one.
Fig. 6 is a photograph of the joint structure obtained in the fifth step of the third test, and fig. 7 is an enlarged view of the inside of the box of fig. 6, and it can be seen that although Ag in the filler-flux AgCu layer of the back layer diffuses to the Cu corrugations to lower the melting point of the Cu corrugations, collapse does not occur. The existence of a large AgCu eutectic structure can be observed at the corner of the corrugated structure, but the corrugated bracket does not have a large continuous AgCu eutectic structure, so that the Cu corrugation still keeps the original configuration. In addition, it was found that the Ag-Cu eutectic on the Invar alloy side was significantly more abundant than Si 3 N 4 The ceramic side is Cu in an Ag-Cu brazing filler metal layer which is enriched to the surface of the Invar alloy. After the connection is finished, the porous silicon nitride ceramic/Invar alloy radome joint has no obvious microcrack.
And (4) testing: the test is a method for connecting a ceramic radome and a metal connecting ring, which is carried out according to the following steps: this test differs from the test one in that: the soft brazing filler metal in the third step is a Cu corrugated layer, the tooth height is 2mm, and the tooth shape is a triangle, as shown in figure 3. The rest is the same as test one.
And (5) testing: the test is a method for connecting a ceramic radome and a metal connecting ring, which is carried out according to the following steps: this test differs from the test one in that: the soft brazing filler metal in the third step is foamed nickel, and the thickness of the soft brazing filler metal is 2 mm. The rest is the same as test one.
FIG. 8 shows the complete set of joint tissues obtained in step five of experiment fiveIn the SEM image of the body, fig. 9 is the first partial enlarged view of fig. 8, fig. 10 is the second partial enlarged view of fig. 8, and fig. 11 is the third partial enlarged view of fig. 8, it can be seen that when the nickel foam having a thickness of 2mm is selected, Ag in the brazing filler metal AgCu brazing filler metal layer is diffused to the nickel foam, and the nickel foam maintains its original configuration. Most of the foamed nickel is two phases corresponding to the A and B regions (figure 10), and the A and B are Ag-Ni solid solution and Cu-Ni solid solution respectively according to the existing literature and energy spectrum analysis. Ti element and porous Si 3 N 4 Rod-like Si of ceramic surface 3 N 4 Reaction takes place to produce Ti 5 Si 3 And TiN, which do not react violently with the nickel foam to form a large amount of intermetallic compounds, which is advantageous for joint connection. After the connection is finished, the joint of the porous silicon nitride ceramic/Invar alloy radome has no obvious microcrack.
Claims (6)
1. A method for connecting a ceramic radome and a metal connecting ring is characterized by comprising the following steps:
firstly, sequentially cleaning Invar alloy connecting rings by absolute ethyl alcohol and acetone;
the center of the Invar alloy connecting ring is a through hole, the upper part of the Invar alloy connecting ring is of a hollow round table structure, and the diameter of the upper end is smaller than that of the lower end; the lower part of the Invar alloy connecting ring is of a hollow cylinder structure; the outer diameter of the bottom end of the upper part of the Invar alloy connecting ring is smaller than that of the lower part of the Invar alloy connecting ring;
II, mixing porous Si 3 N 4 The surface of the ceramic radome is wiped by cotton; said porous Si 3 N 4 The ceramic antenna housing is of a hollow circular ring structure, and the shape of the inner wall of the ceramic antenna housing is the same as that of the outer wall of the upper part of the Invar alloy connecting ring;
thirdly, processing the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into an annular structure with the same shape as the upper outer wall of the Invar alloy connecting ring, then putting the inner layer brazing filler metal, the soft middle layer brazing filler metal and the outer layer brazing filler metal into absolute ethyl alcohol, ultrasonically cleaning for 2-3 min, and putting the materials into an oven to dry;
the inner layer brazing filler metal is AgCu brazing filler metal foil;
the soft interlayer brazing filler metal is Cu corrugated or foam nickel; the thickness of the soft interlayer brazing filler metal is 0.5-5 mm;
the tooth shape of the Cu corrugation is trapezoidal and triangular alternately arranged, rectangular or triangular;
the tooth height of the Cu flute is 0.5 mm-2 mm;
the outer brazing filler metal is AgCuTi brazing filler metal foil;
fourthly, sequentially sheathing an inner layer brazing filler metal, a soft middle layer and an outer layer brazing filler metal on the outer surface of the upper part of the Invar alloy connecting ring, gluing the adjacent layers by 502 glue, and then sheathing porous Si on the outer wall of the upper layer brazing filler metal 3 N 4 The ceramic antenna housing is tightly matched with each layer;
fifthly, placing the workpiece to be welded assembled in the fourth step into a vacuum heating furnace, heating the workpiece to be welded to 300-350 ℃ from room temperature at the speed of 10-15 ℃/min under the vacuum condition, and keeping the temperature at 300-350 ℃ for 30-40 min; then heating up to 850-900 ℃ from 300-350 ℃ at a heating rate of 10-15 ℃/min, preserving the heat at 850-900 ℃ for 10-15 min, then cooling to 300-350 ℃ at 5-10 ℃/min, and then naturally cooling to room temperature to complete the brazing of the ceramic and the metal.
2. The method for connecting the ceramic radome and the metal connecting ring according to claim 1, wherein the ceramic radome is placed in an oven to be dried at 40 ℃ in the third step.
3. The method for connecting a ceramic radome and a metal connecting ring according to claim 1, wherein the thickness of the brazing filler metal in the inner layer in the third step is 50 μm to 100 μm.
4. The method for connecting a ceramic radome and a metal connecting ring according to claim 1, wherein the thickness of the outer layer solder in the third step is 50 μm to 120 μm.
5. The method for connecting the ceramic radome and the metal connecting ring according to claim 1, wherein the workpiece to be welded assembled in the fourth step is placed in a vacuum heating furnace in the fifth step, and the vacuum degree is pumped to 6 x 10 -3 Pa。
6. The method for connecting the ceramic radome and the metal connecting ring according to claim 1, wherein in the fifth step, under the vacuum condition, the temperature is firstly increased from room temperature to 300 ℃ at a rate of 10 ℃/min, and then is kept at 300 ℃ for 30 min; and then raising the temperature from 300 ℃ to 850 ℃ at a heating rate of 10 ℃/min, preserving the heat at 850 ℃ for 10min, then reducing the temperature to 300 ℃ at 5 ℃/min, and then naturally cooling to room temperature to finish the brazing of the ceramic and the metal.
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| CN114147991B (en) * | 2021-11-08 | 2023-11-10 | 湖北三江航天江北机械工程有限公司 | Forming and bonding method for connecting ring |
| CN114571128B (en) * | 2022-04-15 | 2023-05-16 | 华北水利水电大学 | Composite brazing filler metal for brazing ceramic/high-nitrogen steel thermoelectric component, and brazing method and application thereof |
| CN114952082B (en) * | 2022-05-09 | 2023-11-14 | 广东省科学院中乌焊接研究所 | Composite solder for high-precision gradient workpiece, preparation method and application thereof |
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| CN101224526A (en) * | 2008-02-01 | 2008-07-23 | 北京工业大学 | Lead-free compound solder by Ni particle strengthening tin and silver group and preparing method thereof |
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