Tool for welding ceramic and kovar enclosure frame

Abstract

The utility model relates to the technical field of microelectronic packaging application, in particular to a tool for welding ceramic and a kovar enclosure frame, which comprises a pressing plate upper cover, a brazing base, silver-copper solder, the kovar enclosure frame and a ceramic body, the pressing plate upper cover is positioned at the top end of the brazing base, a plurality of first-order sinking grooves are arranged at the top end of the brazing base, and the silver-copper solder is arranged in the first-order sinking grooves. A first-order sinking groove is formed in the bottom end of the pressing plate upper cover, a second-order sinking groove is formed in the first-order sinking groove, a plurality of bosses matched with the first-order sinking groove are arranged at the bottom end of the pressing plate upper cover, and two counterbores are symmetrically formed in the two sides of the bottom end of the brazing base. The problem that two sets of tools are needed in the pre-welding process and the final welding process of the silver-copper welding flux, the kovar enclosure frame and the porcelain body in actual production is solved, it is guaranteed that the silver-copper welding flux is evenly and flatly attached to the welding face of the kovar enclosure frame, and a more excellent brazing environment is provided for subsequent brazing; in addition, the problem that the silver-copper solder is difficult to assemble and position on the product is solved.

Description

Technical Field

[0001] This utility model relates to the field of microelectronic packaging application technology, specifically a tooling for welding ceramic and Kovar frames. Background Technology

[0002] Silver-copper solder, Kovar frame, and ceramic body welding technology are commonly used in the packaging and assembly of electronic devices, especially in applications requiring high reliability and good conductivity. Combining the advantages of silver and copper, it offers excellent corrosion resistance, conductivity, and mechanical strength. Because its melting point is lower than pure silver while still ensuring high connection quality, it is particularly suitable for welding temperature-sensitive components. However, during storage, a thin oxide layer forms on the metal surface, affecting the bonding strength between materials during welding. Pre-welding heating can effectively remove these oxides, thereby improving the quality of the solder joint. It also helps the silver-copper solder better wet the surface to be welded, allowing the molten solder to be more evenly distributed across the entire joint surface, resulting in a stronger and smoother connection. Therefore, it is necessary to first pre-weld the silver-copper solder to the Kovar frame (hereinafter referred to as the pre-welded part), and then finally weld the entire pre-welded part to the ceramic body. Normally, two sets of tooling are required for pre-welding and final welding. To address the above issues, this application designs a tooling for welding ceramics and Kovar frames. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a tooling for welding ceramic and Kovar frames.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a tooling for welding ceramics and Kovar frames, comprising a pressure plate cover, a brazing base, silver-copper solder, a Kovar frame, and a ceramic body. The pressure plate cover is located at the top of the brazing base, and the top of the brazing base has multiple first-stage countersunk grooves. Second-stage countersunk grooves are formed on the first-stage countersunk grooves. The bottom of the pressure plate cover has multiple bosses that fit the first-stage countersunk grooves. The bottom of the brazing base has two countersunk holes symmetrically formed on both sides, and through holes are formed on the countersunk holes. The through holes penetrate the brazing base vertically. The pressure plate cover has another through hole on each side corresponding to the through hole. The ceramic body is placed in and fitted with the first-stage countersunk groove, and the silver-copper solder and Kovar frame are placed in and fitted with the second-stage countersunk groove.

[0007] Furthermore, the present invention is improved in that a first clearance circular groove is provided at each of the four corners of the first-stage sink.

[0008] Furthermore, the present invention is improved in that a second avoidance circular groove is provided at each of the four corners of the second-stage sink.

[0009] Furthermore, the present invention is improved by providing an auxiliary unloading hole at the middle position on the second-stage settling tank.

[0010] Furthermore, the present invention is improved in that the first-stage sink and the boss are both provided with 60 units and are evenly distributed.

[0011] Furthermore, the present invention is improved in that both the pressure plate cover and the brazing base are made of graphite plate.

[0012] (III) Beneficial Effects

[0013] Compared with the prior art, this utility model provides a tooling for welding ceramic and Kovar frames, which has the following beneficial effects:

[0014] This tooling for welding ceramic and Kovar frames solves the problem of needing two sets of tooling for the pre-welding and final welding of silver-copper solder, Kovar frame and ceramic body in actual production. It not only ensures that the silver-copper solder adheres evenly and flatly to the welding surface of the Kovar frame, providing a better brazing environment for subsequent brazing, but also solves the problem of difficult assembly and positioning of silver-copper solder on the product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first main view structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the first partial structure of the present utility model;

[0017] Figure 3 This is a schematic diagram of the second partial structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the third part of the structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the welding structure of the silver-copper solder and Kovar frame of this utility model;

[0020] Figure 6 This is a schematic diagram of the welding structure between the pre-welded component and the ceramic body of this utility model.

[0021] In the diagram: 1. Pressure plate cover; 2. Brazing base; 3. Silver-copper solder; 4. Kovar frame; 5. Porcelain body; 6. First-stage sinker; 7. Second-stage sinker; 8. Boss; 9. Countersunk hole; 10. Through hole; 11. First clearance circular groove; 12. Second clearance circular groove; 13. Auxiliary unloading hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-6 A tooling for welding ceramics and Kovar frames 4 includes a pressure plate cover 1, a brazing base 2, a silver-copper solder 3, a Kovar frame 4, and a ceramic body 5. The pressure plate cover 1 is located at the top of the brazing base 2. The top of the brazing base 2 has multiple first-stage countersunk grooves 6 and second-stage countersunk grooves 7. The bottom of the pressure plate cover 1 has multiple bosses 8 that fit the first-stage countersunk grooves 6. The bottom of the brazing base 2 has two countersunk holes 9 symmetrically located on both sides. The countersunk holes 9 have through holes 10 that penetrate the brazing base 2 vertically. The pressure plate cover 1 has another through hole 10 on each side corresponding to the through holes 10. The ceramic body 5 is placed in and fits into the first-stage countersunk grooves 6. The silver-copper solder 3 and the Kovar frame 4 are placed in and fit into the second-stage countersunk grooves 7.

[0024] The dimensions of the pressure plate cover 1 are 150mm*90mm*8mm, the dimensions of the brazed base 2 are 150mm*90mm*10mm, the dimensions of the first-stage sink 6 are 10.8mm*10.8mm*2.3mm, and the dimensions of the second-stage sink 7 are 10.58mm*10.58mm*0.5mm.

[0025] When welding the silver-copper solder 3 to the Kovar frame 4, first place the silver-copper solder 3 into the second-stage sink 7 of the brazing base 2, then place the Kovar frame 4 into the second-stage sink 7 of the brazing base 2 in the same way, and then fit the pressure plate cover 1 with the brazing base 2. At this time, the protrusion 8 of the pressure plate cover 1 can perfectly press the Kovar frame 4 and the silver-copper solder 3, and then pre-welding and sintering can be carried out.

[0026] When the silver-copper solder 3 and Kovar frame 4 are welded together and then welded to the ceramic body 5, after the pre-welding, the side of the pre-welded part with the Kovar frame 4 should face the brazing base 2 and be placed in its second-stage sink 7. Then, the ceramic body 5 should be placed in the first-stage sink 6 of the brazing base 2. Then, the pressure plate cover 1 should be fitted with the brazing base 2. At this time, the protrusion 8 of the pressure plate cover 1 can perfectly press the ceramic body 5 and the pre-welded part together, and the ceramic body 5 can perfectly fit the side of the pre-welded part with the silver-copper solder 3. Then, the final welding and sintering can be carried out.

[0027] In actual use, it was found that in order to avoid the right angle of the ceramic body 5 and prevent damage, the radius of the first avoidance circular groove 11 is set to 1.0mm. In this embodiment, the first avoidance circular groove 11 is provided at the four corners of the first-stage sink 6.

[0028] In actual use, it was found that in order to avoid the right angle between the Kovar frame 4 and the silver-copper solder 3 and prevent collisions, a second avoidance circular groove 12 with a radius of 0.5mm was set. The second avoidance circular groove 12 was opened at the four corners of the second-stage sink 7.

[0029] In actual use, it was found that in order to facilitate the unloading of the welded object, in this embodiment, an auxiliary unloading hole 13 is provided at the middle position on the second-stage sink 7.

[0030] In actual use, it was found that in order to improve production efficiency and perform multiple welding simultaneously, in this embodiment, the first-stage sink 6 and the boss 8 are each provided with 60 units and are evenly distributed.

[0031] In practical use, it was found that both the brazing base 2 and the pressure plate cover 1 are made of high-density graphite, which has extremely high heat resistance, excellent thermal conductivity, and a low coefficient of thermal expansion. During the pre-welding of the silver-copper solder 3 to the Kovar frame 4 and the welding of the pre-welded parts to the ceramic body 5, the excellent thermal conductivity allows the solder to be heated evenly, so that the silver-copper solder 3, the Kovar metal fittings, and the metallized ceramic body 5 are sintered evenly and tightly. In addition, its low coefficient of expansion can ensure a stable amount of deformation at higher brazing temperatures, thereby ensuring that the silver-copper solder 3 is evenly distributed on the Kovar metal fittings, thus ensuring the reliability and stability of the entire product welding. In this embodiment, both the pressure plate cover 1 and the brazing base 2 are made of graphite plate.

[0032] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0033] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0034] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tool for welding ceramic and Kovar frame, comprising a pressing plate upper cover (1), a soldering base (2), silver copper solder (3), Kovar frame (4) and porcelain body (5), characterized in that: The upper cover (1) of the pressing plate is located at the top end of the brazing base (2), the top end of the brazing base (2) is provided with a plurality of first-order grooves (6), the first-order grooves (6) are provided with second-order grooves (7), the bottom end of the upper cover (1) of the pressing plate is provided with a plurality of bosses (8) matched with the first-order grooves (6), the bottom end of the brazing base (2) is provided with two countersunk holes (9) symmetrically arranged on both sides, the countersunk holes (9) are provided with through holes (10), the through holes (10) vertically penetrate the brazing base (2), the upper cover (1) of the pressing plate is provided with another through hole (10) corresponding to the through hole (10) on both sides, the porcelain body (5) is arranged in the first-order groove (6) and matched with the first-order groove (6), the silver copper solder (3) and the Kovar frame (4) are arranged in the second-order groove (7) and matched with the second-order groove (7).

2. The tooling for welding ceramic and Kovar enclosures of claim 1, wherein: The first-order grooves (6) are provided with first-avoidance circular grooves (11) at four corner positions.

3. The tooling for welding ceramic and Kovar enclosures of claim 2, wherein: The second-order grooves (7) are provided with second-avoidance circular grooves (12) at four corner positions.

4. The tooling for welding ceramic and Kovar enclosures of claim 3, wherein: The second-order grooves (7) are provided with auxiliary discharge holes (13) at the middle positions.

5. A tooling for welding ceramic and Kovar enclosures according to claim 4, wherein: The first-order grooves (6) and the bosses (8) are both provided with 60 and are uniformly distributed.

6. A tooling for welding ceramic and Kovar enclosures according to claim 5, wherein: The upper cover (1) of the pressing plate and the brazing base (2) are both processed from graphite plates.

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