A ceramic brazing jig

Abstract

The utility model provides a kind of ceramic brazing fixture. Including base and deadweight block, the base is provided with air inlet hole, the base is provided with lining plate, the base is further provided with fixed block, the deadweight block is provided with exhaust hole. In the utility model, the accurate fixing of fixed block, the support of bearing cylinder and the uniform heating caused by air inlet hole reduce the residual stress generated by the difference of thermal expansion coefficient between ceramic and metal, and the defective rate caused by the explosion of ceramic due to stress is reduced to 0.001%. In addition, the recess of the deadweight block provides directional pressure, and the optimized wet environment of the protective gas (circulated through the air inlet hole and the exhaust hole) improves the welding strength by 5% compared with the prior art. At the same time, the uniform heating design reduces the welding cooling time by 30%, while the defective rate is reduced, the operation is simplified, and the production cost is reduced by 20% compared with the same period, which greatly improves the efficiency and product qualification rate of welding production.

Description

Technical Field

[0001] This utility model relates to brazing fixtures, and more particularly to a ceramic brazing fixture, belonging to the field of brazing technology. Background Technology

[0002] Ceramics, due to their advantages such as high temperature resistance, good insulation, and high hardness, are often combined with metals to form composite components to meet the needs of different applications. The connection between ceramics and metals relies on brazing technology, the development of which can be traced back to the early 20th century: in 1935, Siemens of Germany first applied ceramic metallization technology to vacuum electronic devices; in 1956, the United States developed the activated Mo-Mn method, promoting the application of alumina ceramics to metals in the electronics industry; my country began research on ceramic-metal sealing technology at the Beijing Electron Tube Factory in 1958, achieved initial industrialization of ceramic structural components in the 1970s, and entered a large-scale industrialization stage after 2000 with the growth of market demand.

[0003] However, there are three key problems in the existing ceramic-metal brazing process:

[0004] Firstly, excessive residual stress: The thermal expansion coefficients of ceramics and metals differ significantly. When they cool after welding, the contraction rates of the two are different, resulting in large residual stress at the sealing interface, which can easily cause ceramics to crack.

[0005] Secondly, the connection reliability is poor: the metal does not wet the ceramic surface well, and it is difficult to form a stable connection structure after brazing, which can easily lead to problems such as detachment and leakage.

[0006] Third, welding parameters are difficult to control: the quality of brazing has extremely high requirements for parameters such as temperature and pressure. Existing fixtures cannot provide stable support for parameter control, and welding abnormalities often occur due to unstable fixing and uneven heating, affecting production efficiency and product qualification rate.

[0007] To address this, a ceramic brazing fixture is proposed. Utility Model Content

[0008] In view of this, the present invention provides a ceramic brazing fixture to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0009] The technical solution of this utility model is implemented as follows: a ceramic brazing fixture includes a base and a counterweight block. An air inlet is provided in the base, a liner is provided in the base, a fixing block is also provided in the base, an exhaust hole is provided in the counterweight block, and a product body and a metal connector are provided between the fixing block and the counterweight block.

[0010] More preferably, the counterweight block has a groove on the side facing the metal connector, and the shape of the groove is adapted to the metal connector.

[0011] More preferably, one end of the vent hole penetrates the outer wall of the counterweight block, and the other end is connected to the groove.

[0012] More preferably, the product body is provided with a reserved slot for the insertion of metal connectors.

[0013] More preferably, the base is further provided with a support cylinder, which is located in the inner cavity of the product body, and the axis of the support cylinder is collinear with the axis of the metal connector.

[0014] More preferably, the fixing block is provided with a storage groove, and the inner wall contour of the storage groove is adapted to the outer wall contour of the product body.

[0015] The present invention has the following advantages due to the adoption of the above technical solution:

[0016] In this invention, the precise fixing of the fixing block, the support of the bearing cylinder, and the uniform heating brought by the air inlet reduce the residual stress caused by the difference in thermal expansion coefficients between ceramics and metals, reducing the failure rate of ceramics due to stress-induced cracking to 0.001%. In addition, the groove of the counterweight block provides directional pressure, and the optimized wetting environment of the protective gas (circulating through the air inlet and exhaust holes) improves the welding strength by 5% compared with the prior art. At the same time, the uniform heating design reduces the welding cooling time by 30%, while the failure rate is reduced, the operation is simplified, and the production cost is reduced by 20% year-on-year, which greatly improves the efficiency of welding production and the product qualification rate.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the upward-facing structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 4 These are exploded views of the various structures in this utility model.

[0023] Reference numerals: 1. Base; 2. Air inlet; 3. Liner; 4. Fixing block; 5. Product body; 6. Metal connector; 7. Counterweight block; 8. Exhaust port; 9. Supporting cylinder; 10. Groove. Detailed Implementation

[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, this utility model embodiment provides a ceramic brazing fixture, including a base 1 and a counterweight 7. The base 1 is provided with an air inlet 2, a liner 3, and a fixing block 4. The counterweight 7 is provided with an exhaust hole 8. A product body 5 and a metal connector 6 are provided between the fixing block 4 and the counterweight 7.

[0027] In one embodiment, the counterweight 7 has a groove 10 on the side facing the metal connector 6, and the shape of the groove 10 is adapted to the metal connector 6. The groove 10 can accurately transfer the weight of the counterweight 7 to the metal connector 6, providing stable and directional pressure for the mating surface of the "product body 5-metal connector 6", avoiding separation of the mating surface during welding, and preparing for subsequent enhancement of the wettability of the metal to the ceramic.

[0028] In one embodiment, one end of the vent 8 penetrates the outer wall of the counterweight 7, and the other end is connected to the groove 10. This is used to discharge excess shielding gas and waste gas generated during the welding process from the space to be welded.

[0029] In one embodiment, the product body 5 is provided with a reserved slot for the insertion of a metal connector 6. The reserved slot is used for the insertion of the metal connector 6 to form a precisely mating structure to be welded.

[0030] In one embodiment, the base 1 is further provided with a support cylinder 9, which is located in the inner cavity of the product body 5. The axis of the support cylinder 9 is collinear with the axis of the metal connector 6. The support cylinder 9 is used to support the metal connector 6 to prevent it from sinking and to ensure docking accuracy.

[0031] In one embodiment, the fixing block 4 is provided with a storage groove, the inner wall contour of which is adapted to the outer wall contour of the product body 5. The storage groove is used to wrap and fix the product body 5 to prevent displacement during welding.

[0032] When this utility model is in operation: first, the ceramic part to be welded on the product body 5 is placed in the storage groove of the fixing block 4. The inner wall contour of the storage groove is perfectly matched with the outer wall contour of the product body 5, so the product body 5 can be firmly fixed and avoid left and right displacement during welding; then, the metal connector 6 is inserted into the reserved groove of the product body 5, while ensuring that the bottom of the metal connector 6 is aligned with the bearing cylinder 9 in the base 1. The bearing cylinder 9 can support the metal connector 6 and prevent it from sinking due to its own weight or subsequent pressure, thus laying the positional foundation for subsequent welding.

[0033] Place the counterweight 7 on top of the product body 5 and the metal connector 6, so that the groove 10 under the counterweight 7 is completely fitted with the metal connector 6. Introduce protective gas, such as inert gas, through the air inlet 2 in the base 1. The gas can diffuse evenly into the fixture along the air inlet 2, covering the mating surface of "product body 5-metal connector 6", isolating it from air, and preventing the ceramic and metal from being oxidized by oxygen in the air during welding, thus preventing the formation of an oxide layer on the mating surface that affects the welding strength.

[0034] Excess gas and welding fumes, such as those from the volatilization of the brazing filler metal, are discharged through the vent 8 inside the counterweight 7, preventing the appearance of a weld but actual lack of a strong connection. The uniform airflow from the air inlet 2 helps to evenly transfer heat within the fixture, preventing localized overheating or undercooling of the mating surfaces and resolving the issue of "localized stress concentration" caused by the difference in thermal expansion coefficients between ceramic and metal. The stable pressure continuously provided by the counterweight 7 promotes better "fitting" of the heated metal connector 6 to the ceramic surface of the product body 5, resulting in a tighter connection. After welding, allowing the product body 5 and metal connector 6 to cool naturally as a whole, the fixing block 4 and counterweight 7 restrict the free contraction of the ceramic and metal, reducing the "relative tension" caused by the difference in thermal expansion coefficients and lowering residual stress. After complete cooling, the counterweight 7 is removed, and the finished product is taken out from the fixing block 4, yielding a firmly connected ceramic-metal composite component.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A ceramic brazing fixture, characterized in that: It includes a base (1) and a counterweight (7). The base (1) is provided with an air inlet (2), a liner (3), a fixing block (4), and an exhaust hole (8). The fixing block (4) and the counterweight (7) are provided with a product body (5) and a metal connector (6) between the fixing block (4) and the counterweight (7).

2. The ceramic brazing fixture according to claim 1, characterized in that: The counterweight (7) has a groove (10) on the side facing the metal connector (6), and the shape of the groove (10) is adapted to the metal connector (6).

3. A ceramic brazing fixture according to claim 1, characterized in that: One end of the vent (8) penetrates the outer wall of the counterweight (7), and the other end is connected to the groove (10).

4. A ceramic brazing fixture according to claim 1, characterized in that: The product body (5) is provided with a reserved slot for the insertion of the metal connector (6).

5. A ceramic brazing fixture according to claim 1, characterized in that: The base (1) is also provided with a bearing cylinder (9), which is located in the inner cavity of the product body (5). The axis of the bearing cylinder (9) is collinear with the axis of the metal connector (6).

6. A ceramic brazing fixture according to claim 1, characterized in that: The fixing block (4) is provided with a storage groove, and the inner wall contour of the storage groove is adapted to the outer wall contour of the product body (5).

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