Ceramic brazing electric connector

Abstract

The utility model relates to the technical field of electronics and electrics, and discloses a ceramic brazing electric connecting piece, which comprises a conductive core, a ceramic piece sleeved on the conductive core, a welding layer welded at two ends of the ceramic piece and on the conductive core, and a metal piece arranged on the welding layer, and the metal piece comprises a welding end and a buffer end. A plurality of siphon sheets are arranged at the buffer end, and a plurality of diversion trenches are formed in the siphon sheets; according to the electric connector, the problem that molten solder is prone to overflow due to volume expansion is solved by arranging the buffer end, in addition, in order to avoid the phenomenon of solder overflow caused by different solder expansion coefficients, solid solder machining errors and the like, the electric connector is provided with the siphon piece at the transition end, and the diversion trench is formed in the siphon piece; and when the volume of the molten liquid is expanded to the bottom end of the siphon sheet, the expanded molten liquid can be sucked into the flow guide groove through the siphon effect by the flow guide groove in the siphon sheet, the liquid level is ensured to be always lower than the siphon sheet, and the molten solid welding flux is ensured not to overflow out of a welding seam.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to a ceramic brazing electrical connector. Background Art

[0002] Ceramic-metal connectors are widely used in new energy vehicles, electronics, semiconductor packaging, IGBT modules and other fields. However, the thermal expansion coefficients of ceramics and metals differ greatly, and the wetting effect of metal on the ceramic surface is poor, resulting in the inability to connect ceramics and metals with high quality. Therefore, in order to improve the welding performance of ceramics and metals, a technical solution of ceramic metallization has been proposed in the existing technology. Ceramic metallization is the process of sintering or depositing a layer of metal film on the ceramic surface. Currently, commonly used ceramic metallizations include BeO ceramics, Al2O3 ceramics, AIN ceramics, Si3N4 ceramics, etc.

[0003] Ceramic brazing electrical connectors are electronic devices made by brazing ceramics and metals used in electronic and electrical applications. The metal of ceramic brazing electrical connectors is wrapped around both ends of the ceramic and the metal core. Therefore, in order to ensure the quality of the welding between the metal and the ceramic, the solder is usually made into a solid device and sleeved on the ceramic and the metal core. The metal is then sleeved on the solid solder and placed in a high-temperature environment to melt the solid solder into a liquid and then cool it to weld the metal parts and the ceramic together. The applicant found that in the above process, due to the volume expansion of the content after it is melted from solid to liquid, the liquid will overflow the weld after expansion, resulting in the need to clean up the excess solder on the metal parts during subsequent processing. Increasing the operating process may also easily damage the metal parts. Therefore, it is of great significance to solve the problem of solid solder easily overflowing the weld after melting. Summary of the Invention

[0004] In order to overcome the problem that the solid solder of the ceramic brazing electrical connector in the prior art is easy to overflow the weld after melting, the utility model provides a ceramic brazing electrical connector, which solves the problem that the volume expansion of the molten solder is easy to overflow by setting a buffer end. In addition, in order to avoid solder overflow caused by problems such as different solder expansion coefficients and solid solder processing errors, the electrical connector is provided with a siphon plate on the transition end, and a guide groove is provided on the siphon plate. When the volume of the melted liquid expands to the bottom end of the siphon plate, the guide groove on the siphon plate will suck the expanded molten liquid into the guide groove through the siphon effect, ensuring that the liquid level is always lower than the siphon plate, ensuring that the solid solder will not overflow the weld after melting.

[0005] The specific technical solutions of the present invention are:

[0006] A ceramic brazing electrical connector includes a conductive core, a ceramic part sleeved on the conductive core, a welding layer welded to both ends of the ceramic part and the conductive core, and a metal part arranged on the welding layer. The metal part includes a welding end and a buffer end. The buffer end is provided with a plurality of siphon plates, and the siphon plates are provided with a plurality of guide grooves.

[0007] The present invention provides a ceramic brazing electrical connector, which consists of a conductive core, a ceramic part, and metal parts welded to both ends of the ceramic part. The technical solution provides a buffer end on the metal part to provide a buffer volume for the liquid after the solid solder is melted, thereby preventing the solid solder from overflowing the weld after melting. In addition, the applicant takes into account that since different solders have different expansion coefficients after melting, it is necessary to accurately control and process the size of the solid solder. However, the processing of solid solder is difficult and the precision is difficult to control. Therefore, some electrical connections in the same batch will still have the problem of molten solder overflowing. Therefore, in order to solve the above problem, the present invention provides a siphon plate on the buffer end, and a guide groove is provided on the siphon plate. When the liquid level of the molten solid solder contacts the guide groove opening of the siphon plate, the guide groove will suck the liquid into the guide groove through capillary action, so that the molten liquid level will never exceed the bottom end of the guide groove, thereby ensuring that the liquid level of solders with different expansion coefficients after melting will never exceed the bottom surface of the guide groove.

[0008] Preferably, the metal piece includes an upper metal piece located on the top of the ceramic piece and a lower metal piece located on the bottom of the ceramic piece.

[0009] Preferably, the upper metal member includes a first buffer end welded to the outside of the conductive core and a first welding end welded to the conductive core and the top of the ceramic member.

[0010] Preferably, the lower metal part includes a second buffer end sleeved on the bottom of the ceramic part and a second welding end welded to the bottom of the ceramic part and the conductive core.

[0011] Preferably, the inner diameter of the guide groove is 0.1~1 mm.

[0012] Preferably, the surface of the ceramic piece is provided with a metallized alloy ceramic layer.

[0013] Preferably, the alloy ceramic layer is a molybdenum-manganese ceramic layer.

[0014] Preferably, a nickel layer is further provided on the alloy ceramic layer.

[0015] Preferably, the welding layer is made of metal solder.

[0016] Preferably, the welding layer is made of silver, copper or stainless steel.

[0017] Compared with the existing technology, this application has the following technical effects:

[0018] The utility model provides a ceramic brazing electrical connector, which solves the problem of molten solder volume expansion and easy overflow by providing a buffer end. In addition, in order to avoid solder overflow caused by problems such as different solder expansion coefficients and solid solder processing errors, the electrical connector is provided with a siphon plate on the transition end, and a guide groove is provided on the siphon plate. When the volume of the melted liquid expands to the bottom end of the siphon plate, the guide groove on the siphon plate will suck the expanded molten liquid into the guide groove through the siphon effect, ensuring that the liquid level is always lower than the siphon plate, ensuring that the solid solder will not overflow the weld after melting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] Figure 2 It is a cross-sectional view of the utility model.

[0021] In the figure, the conductive core 1, the ceramic part 2, the welding layer 3, the metal part 4, the welding end 401, the buffer end 402, the siphon plate 421, the guide groove 422, the upper metal part 403, the first buffer end 431, the first welding end 432, the lower metal part 404, the second buffer end 441 and the second welding end 442. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Example 1:

[0024] like Figure 1 As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, wherein the solid solder is silver.

[0025] like Figure 2As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and welded to the metal core, and a siphon plate 421 is also provided on the buffer end, one end of the siphon plate is connected to the buffer end, and a guide groove 422 is provided on the surface of the siphon plate at the other end, and the inner diameter of the guide groove is 0.5 mm.

[0026] Example 2:

[0027] like Figure 1 As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, wherein the solid solder is silver.

[0028] like Figure 2 As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and welded to the metal core, and a siphon plate 421 is also provided on the buffer end, one end of the siphon plate is connected to the buffer end, and a guide groove 422 is provided on the surface of the siphon plate at the other end, and the inner diameter of the guide groove is 0.1 mm.

[0029] Example 3:

[0030] like Figure 1As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, wherein the solid solder is silver.

[0031] like Figure 2 As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and welded to the metal core, and a siphon plate 421 is also provided on the buffer end, one end of the siphon plate is connected to the buffer end, and a guide groove 422 is provided on the surface of the siphon plate at the other end, and the inner diameter of the guide groove is 1 mm.

[0032] Example 4:

[0033] like Figure 1 As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, and the solid solder is a silver-copper alloy.

[0034] like Figure 2As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and welded to the metal core, and a siphon plate 421 is also provided on the buffer end, one end of the siphon plate is connected to the buffer end, and a guide groove 422 is provided on the surface of the siphon plate at the other end, and the inner diameter of the guide groove is 1 mm.

[0035] Example 5:

[0036] like Figure 1 As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, and the solid solder is a silver-copper alloy.

[0037] like Figure 2 As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and welded to the metal core, and a siphon plate 421 is also provided on the buffer end, one end of the siphon plate is connected to the buffer end, and a guide groove 422 is provided on the surface of the siphon plate at the other end, and the inner diameter of the guide groove is 1 mm.

[0038] Comparative Example 1:

[0039] Compared with the embodiment, the alloy piece in comparative example 1 is not provided with a buffer end and a siphon sheet;

[0040] like Figure 1As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401. The metal member is connected to the ceramic member and the conductive core via a welding layer 3. The welding layer is formed by welding with solid solder, and the solid solder is silver.

[0041] like Figure 2 As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first welding end 432, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, and the lower metal part includes a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part.

[0042] Comparative Example 2:

[0043] Compared with the embodiment, in comparative example 2, no siphon sheet is provided on the buffer end;

[0044] like Figure 1 As shown, a ceramic brazing electrical connector includes a conductive core 1, a ceramic member 2 sleeved on the conductive core, and metal members 4 welded to both ends of the ceramic member and the conductive core. The conductive core is made of copper, and the ceramic member is made of alumina ceramic. The surfaces of the ceramic member at both ends to be welded are metallized to form an alloy ceramic layer and a nickel layer disposed on the alloy ceramic layer. The metal member includes a welding end 401 and a buffer end 402. The metal member is connected to the ceramic member and the conductive core via a welding layer 3, which is formed by welding with solid solder, wherein the solid solder is silver.

[0045] like Figure 2 As shown, the metal part includes an upper metal part 403 and a lower metal part 404, the upper metal part includes a first buffer end 431 and a first welding end 432, the first buffer end is sleeved on the metal core near the top of the ceramic part, the first welding end is welded to the top of the ceramic part and the metal core near the top of the ceramic part, the first buffer end is located at the head of the first welding end and is welded to the metal core, the lower metal part includes a second buffer end 441 and a second welding end 442, the second welding end is welded to the bottom of the ceramic part and the metal core near the bottom of the ceramic part, the second buffer end is located at the head of the first welding end and is welded to the metal core.

[0046] Test example:

[0047] The welds of the ceramic brazing electrical connectors obtained in Examples 1 to 5 and Comparative Examples 1 to 2 were tested. After testing, it was found that the welds of the ceramic brazing electrical connectors of the same batch obtained in Examples 1 to 5 all had the problem of solder overflow, while some of the ceramic brazing electrical connectors in Comparative Example 1 that did not have a buffer end and a siphon sheet had the problem of solder overflow. Due to the small size of the electrical connectors, it is difficult to accurately control the precision of the solid solder during processing, so the sizes of the solid solder parts produced vary greatly. After the solid solder is assembled between the metal parts and the ceramic parts, there will be certain errors in the electrical connectors of the same batch. These errors will cause the volume of the solid solder in some welds to be larger than the volume that the weld can accommodate the liquid solder after melting, resulting in the metal parts without buffer ends being unable to be welded. The expanded volume of the molten solder causes solder overflow; in addition, since different solders have different volume expansion coefficients, in order to ensure that the same batch of ceramic brazing parts will not have the problem of solder overflow, it is usually necessary to accurately control and process the size of the solid solder. The processing of solid solder is difficult, and the dimensional accuracy control is difficult, which significantly increases production efficiency and cost. After the siphon plate is set, the siphon action of the siphon plate is used. After the volume-expanded liquid solder contacts the guide groove on the siphon plate, the liquid is absorbed into the guide groove under the action of capillary tube, so that the liquid level will never exceed the metal part, and the problem of liquid solder overflow will not occur. This structure can be applied to solid solders with different expansion coefficients, and can avoid the occurrence of solder overflow caused by solid solder processing errors.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A ceramic brazing electrical connector, characterized in that: The invention comprises a conductive core (1), a ceramic piece (2) sleeved on the conductive core, a welding layer (3) welded to both ends of the ceramic piece and the conductive core, and a metal piece (4) provided on the welding layer, wherein the metal piece comprises a welding end (401) and a buffer end (402), the buffer end is provided with a plurality of siphon sheets (421), and the siphon sheet is provided with a plurality of guide grooves (422).

2. The ceramic brazing electrical connector according to claim 1, wherein: The metal piece comprises an upper metal piece (403) located on the top of the ceramic piece and a lower metal piece (404) located on the bottom of the ceramic piece.

3. The ceramic brazing electrical connector according to claim 2, wherein: The upper metal piece comprises a first buffer end (431) welded to the outside of the conductive core and a first welding end (432) welded to the conductive core and the top of the ceramic piece.

4. The ceramic brazing electrical connector according to claim 2, wherein: The lower metal part comprises a second buffer end (441) sleeved on the bottom of the ceramic part and a second welding end (442) welded to the bottom of the ceramic part and the conductive core.

5. The ceramic brazing electrical connector according to claim 1, wherein: The inner diameter of the guide groove is 0.1-1 mm.

6. The ceramic brazing electrical connector according to claim 1, wherein: The surface of the ceramic piece is provided with a metallized alloy ceramic layer.

7. The ceramic brazing electrical connector according to claim 6, characterized in that: The alloy ceramic layer is a molybdenum-manganese ceramic layer.

8. The ceramic brazing electrical connector according to claim 7, wherein: A nickel layer is also provided on the alloy ceramic layer.

9. The ceramic brazing electrical connector according to claim 1, wherein: The material of the welding layer is metal solder.

10. The ceramic brazing electrical connector according to claim 1 or 9, characterized in that: The welding layer is made of silver, copper or stainless steel.

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