CN218159833U - Lead wire ceramic insulator seal structure - Google Patents
Lead wire ceramic insulator seal structure Download PDFInfo
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- CN218159833U CN218159833U CN202222330290.9U CN202222330290U CN218159833U CN 218159833 U CN218159833 U CN 218159833U CN 202222330290 U CN202222330290 U CN 202222330290U CN 218159833 U CN218159833 U CN 218159833U
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Abstract
The utility model provides a lead wire ceramic insulator seal structure, belong to electronic packaging technical field, including ceramic insulator, the lead wire, inner seal circle and external seal circle, ceramic insulator sealing hole is downthehole no metallization layer, the lead wire is installed in sealing hole, ceramic insulator inner end face and outer terminal surface all are equipped with metallization layer and pin connection, the outer circumference of lead wire is located to inner seal circle and external seal circle all cover, the inner seal circle is pasted in ceramic insulator inner end face, external seal circle is pasted in ceramic insulator outer terminal surface, realize sealedly with the lead wire welding through both ends metallization layer, avoid appearing because of the crack defect of lead wire and ceramic insulator welding stress production, and then guarantee the long-term reliability of product when follow-up use, weld inner seal circle and external seal circle in inside and outside terminal surface, on the one hand with brazing stress dispersion to ceramic insulator and sealing washer, sealing washer and lead wire, improve lead wire and ceramic insulator welding strength.
Description
Technical Field
The utility model belongs to the technical field of the electronic packaging, more specifically says, relates to a lead wire ceramic insulator seal structure.
Background
In the prior art, a microelectronic package generally adopts metal as a main body of the package, and a lead is led out after being welded with a ceramic insulator. The lead wire is connected with the ceramic insulator through a metalized layer in a sealing hole on the ceramic insulator, and because the lead wire has different expansion coefficients with the ceramic, sealing stress can be generated in the high-temperature brazing process, so that cracks extending outwards are easily generated in the ceramic insulator, the problem of air leakage is caused, the sealing property of a sealing shell is influenced, and even the product fails.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a lead wire ceramic insulator seal structure, aim at solving above-mentioned lead wire of mentioning and produce sealing stress easily after being connected with ceramic insulator through the metallization layer that ceramic insulator seals the hole, make ceramic insulator the technical problem that crackle appears.
In order to achieve the purpose, the utility model adopts the technical proposal that: the utility model provides a lead wire ceramic insulator seal structure, including ceramic insulator, lead wire, interior sealing washer and the outer sealing washer that has the seal hole, ceramic insulator is downthehole no metallization layer of seal, the lead wire is installed in the seal hole, ceramic insulator inner end face and outer terminal surface all be equipped with metallization layer and metallization layer with the pin connection, interior sealing washer with the outer sealing washer all overlaps and locates the outer circumference of lead wire, interior sealing washer paste in ceramic insulator inner end face, the outer sealing washer paste in ceramic insulator outer end face.
In a possible implementation manner, the inner sealing ring and the outer sealing ring are both metal sealing rings and can be connected with the metallization layer and the lead.
In a possible implementation manner, the metalized layers on the inner end face and the outer end face of the ceramic insulator are both formed into a circular ring shape and are arranged coaxially with the sealing hole.
In one possible implementation, the outer diameter of the metallization layer is greater than the outer diameter of the lead by more than 0.5 mm.
In a possible implementation manner, the outer diameter of the inner sealing ring is smaller than the outer diameter of the metalized layer on the inner end face of the ceramic insulator by more than 0.2 mm.
In a possible implementation manner, the outer diameter of the outer sealing ring is smaller than the outer diameter of the metalized layer on the outer end face of the ceramic insulator by more than 0.2 mm.
In a possible implementation manner, the outer diameter of the metalized layer on the inner end face of the ceramic insulator is smaller than the outer diameter of the metalized layer on the outer end face of the ceramic insulator.
In a possible implementation manner, the ceramic insulator is cylindrical and made of alumina ceramic, the sealing hole is located in the middle, the lead is made of zirconium-copper alloy, and the inner sealing ring and the outer sealing ring are made of kovar alloy.
In a possible implementation manner, the distance between the metallization layer on the inner end face of the ceramic insulator and the inner seal ring is greater than 0.1mm, and the distance between the metallization layer on the outer end face of the ceramic insulator and the outer seal ring is greater than 0.1mm.
In a possible implementation manner, the inner sealing ring is welded and fixed to the lead and the inner end face of the ceramic insulator, and the outer sealing ring is welded and fixed to the lead and the outer end face of the ceramic insulator.
The utility model provides a pair of lead wire ceramic insulator seal structure's beneficial effect lies in: compared with the prior art, the utility model relates to a lead wire ceramic insulator seal structure includes ceramic insulator, the lead wire, inner seal circle and external seal circle, ceramic insulator sealing hole is downthehole no metallization layer, the lead wire is installed in sealing hole, ceramic insulator inner end face and outer terminal surface all are equipped with metallization layer and pin connection, the outer circumference of lead wire is located to inner seal circle and external seal circle all cover, inner seal circle pastes in ceramic insulator inner end face, external seal circle pastes in ceramic insulator outer terminal surface, realize sealedly through both ends metallization layer and lead wire welding, avoid appearing because of the crack defect that lead wire and ceramic insulator welding stress produced, and then guarantee the long-term reliability of product when follow-up use, weld inner seal circle and external seal circle in inside and outside terminal surface, on the one hand with braze welding stress dispersion to ceramic insulator and sealing washer, sealing washer and lead wire are last, improve lead wire and ceramic insulator welding strength.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a sealing structure for a lead ceramic insulator according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a ceramic insulator of a sealing structure of a lead wire ceramic insulator according to an embodiment of the present invention;
fig. 3 is a schematic view of a usage state structure of a sealing structure for a lead ceramic insulator according to an embodiment of the present invention;
FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3;
fig. 5 is an enlarged view of fig. 4 at B.
Description of reference numerals:
1. a ceramic insulator; 2. a lead; 3. an inner seal ring; 4. an outer sealing ring; 5. a metallization layer; 6. sealing the hole; 7. a wall body; 8. a chassis.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 to 5, a sealing structure of a lead ceramic insulator according to the present invention will now be described. The utility model provides a lead wire ceramic insulator seal structure, including ceramic insulator 1 that has the seal hole, lead wire 2, interior sealing washer 3 and external seal circle 4, there is not the metallization layer in ceramic insulator 1 seal hole, lead wire 2 installs in seal hole 6, 1 interior terminal surface of ceramic insulator and outer terminal surface all are equipped with metallization layer 5 and metallization layer 5 is connected with lead wire 2, interior sealing washer 3 and external seal circle 4 all overlap and locate the outer circumference of lead wire 2, interior sealing washer 3 pastes in 1 interior terminal surface of ceramic insulator, external seal circle 4 pastes in 1 outer terminal surface of ceramic insulator.
The utility model provides a pair of lead wire ceramic insulator seal structure, compared with the prior art, there is not the metallization layer in 1 sealing hole 6 of ceramic insulator, lead wire 2 installs in sealing hole 6, 1 interior terminal surface of ceramic insulator and outer terminal surface all are equipped with metallization layer 5 and lead wire 2 are connected, interior sealing washer 3 and outer seal ring 4 all overlap and locate the outer circumference of lead wire 2, interior sealing washer 3 pastes in 1 interior terminal surface of ceramic insulator, outer terminal surface of outer seal ring 4 subsides in 1 ceramic insulator, realize sealedly with lead wire 2 welding through both ends metallization layer 5, avoid appearing because of the crackle defect that lead wire 2 and 1 welding stress of ceramic insulator produced, and then guarantee the long-term reliability of product when follow-up using, weld interior sealing washer 3 and outer seal ring 4 in interior terminal surface, on the one hand with brazing stress dispersion to ceramic insulator 1 and sealing washer, sealing washer and lead wire 2 are last, improve lead wire 2 and 1 welding strength.
Through not setting up metallization layer 5 in sealing-in hole 6, only set up metallization layer 5 respectively at ceramic insulator 1's interior terminal surface and outer terminal surface, can solve the sealing-in stress that lead wire 2 and metallization layer 5 in the sealing-in hole 6 are connected and are produced like this, prevent that crackle from appearing in ceramic insulator 1, the utility model discloses the gas tightness is good. The inner sealing ring 3 and the outer sealing ring 4 are fixedly connected with the end face of the ceramic insulator 1 and the lead 2 in a welding mode.
In some embodiments, referring to fig. 1 to 5, the inner seal ring 3 and the outer seal ring 4 are both metal seal rings, and both can be connected to the metallization layer 5 and the lead 2. The metal sealing ring is made of alloy materials such as kovar alloy, iron-nickel alloy and the like or pure metal materials such as copper, nickel, iron and the like.
As an alternative embodiment of the metal sealing ring, the inner sealing ring 3 and the outer sealing ring 4 are both solder sealing rings, and the solder sealing rings are silver-based solder, copper-based solder, or other high-temperature solder or low-temperature solder. The lead 2 is made of metal materials such as kovar alloy, kovar copper, copper and copper alloy.
In some embodiments, referring to fig. 1 to 5, the metalized layers 5 on the inner end surface and the outer end surface of the ceramic insulator 1 are formed in a circular ring shape and are disposed coaxially with the sealing hole 6.
In some embodiments, referring to fig. 1 to 5, the outer diameter of the metallization layer 5 is greater than the outer diameter of the lead 2 by more than 0.5 mm. The outer diameter of the inner end face metallization layer 5 is 1.4mm, the diameter of the lead 2 is 0.8mm, and the diameter of the ceramic insulator 1 is 2.2mm, and after the size optimization, the lead 2 and the ceramic insulator 1 can have enough welding strength, and enough insulation resistance can be obtained.
The outer end face metallization layer 5 of the outer end face of the ceramic insulator 1 is fully paved on the outer end face of the ceramic insulator 1, so that the welding strength of the lead 2 and the ceramic insulator 1 can be improved, and the risk of air leakage caused by stress bending of the lead 2 in the assembling or using process is reduced.
In some embodiments, referring to fig. 1 to 5, the outer diameter of the inner seal ring 3 is smaller than the outer diameter of the inner end face metallization layer 5 of the ceramic insulator 1 by more than 0.2 mm. In another embodiment, the outer diameter of the inner seal ring 3 is 1.1mm, which is 0.3mm smaller than the diameter (1.4 mm) of the inner end surface metallization layer 5 of the ceramic insulator 1, and the outer diameter of the outer seal ring 4 is 1.7mm, which is 0.6mm smaller than the diameter (2.3 mm) of the outer end surface metallization layer 5 of the ceramic insulator 1.
In some embodiments, referring to fig. 1 to 5, the outer diameter of the outer sealing ring 4 is smaller than the outer diameter of the metallization layer 5 on the outer end face of the ceramic insulator 1 by more than 0.2 mm.
In some embodiments, referring to fig. 1 to 5, the outer diameter of the inner end surface metallization layer 5 of the ceramic insulator 1 is smaller than the outer diameter of the outer end surface metallization layer 5 of the ceramic insulator 1.
In some embodiments, referring to fig. 1 to 5, the ceramic insulator 1 is cylindrical and made of alumina ceramic, the sealing hole 6 is located in the middle, the lead 2 is made of zirconium-copper alloy, and the inner seal ring 3 and the outer seal ring 4 are made of kovar alloy. The ceramic insulator 1 contains 92% of AlO, and is manufactured by adopting a high-temperature ceramic fired ceramic metallization process, and the specific process comprises the following steps: grinding, granulating, dry pressing, sintering, metalizing, firing and nickel plating.
The metallization of the inner and outer end faces of the ceramic insulator 1 is coated after the ceramic is sintered, and the metallization edges are ensured to be uniform and neat during coating metallization. If the end face of the ceramic insulator 1 is metalized in a circular ring shape, i.e. the entire end face is not coated, the position of the metalized ring should be concentric with respect to the sealing hole 6, and no offset should occur. Since the sealing structure is connected to the lead 2 by metallizing the inner and outer end faces of the ceramic, the bonding strength between the metallizations of the inner and outer end faces and the ceramic is of great importance for the sealing performance of the sealing structure.
In some embodiments, referring to fig. 1 to 5, a distance between the metallization layer 5 of the inner end surface of the ceramic insulator 1 and the inner sealing ring 3 is greater than 0.1mm, and a distance between the metallization layer 5 of the outer end surface of the ceramic insulator 1 and the outer sealing ring 4 is greater than 0.1mm, so that the advantage of optimizing the size of the sealing structure is as follows: the welding stress at the edge of the metallization layer 5 can be reduced, and the risk of peeling the metallization layer 5 from the ceramic can be reduced.
In fig. 3, the ceramic insulators 1 are mounted on a wall 7, the wall 7 is mounted on a chassis 8, the wall 7 is made of kovar alloy, three through holes are formed in the right side, the ceramic insulators 1 are welded with the wall 7 through the through holes in the right side of the wall 7, the chassis 8 is made of WCu15, the number of the ceramic insulators 1 is three, and the lead wires 2 are consistent with the number of the ceramic insulators 1 and are arranged in a one-to-one correspondence manner.
In some embodiments, referring to fig. 1 to 5, the inner sealing ring 3 is respectively welded and fixed to the inner end surfaces of the lead 2 and the ceramic insulator 1, and the outer sealing ring 4 is respectively welded and fixed to the outer end surfaces of the lead 2 and the ceramic insulator 1, so that hermetic sealing is achieved after the fixed connection. In order to weld the sealing ring and the metallization layer 5 together, on one hand, the brazing stress can be dispersed on the ceramic insulator 1 and the sealing ring, and the sealing ring and the lead wire 2, and on the other hand, the lead wire 2 and the ceramic insulator 1 can be reliably welded by using a small welding flux, so that the connecting effect and the air tightness are ensured.
When the inner seal ring 3 or the outer seal ring 4 is not specifically indicated, the seal rings above or below are both referred to. The end faces of the ceramic insulator 1 in the above or below are both inner and outer end faces when the end faces of the ceramic insulator 1 are not specified.
In the prior art, after the metallized ceramic insulator 1 covered in the sealing hole 6 is welded with the lead 2, cracks extending outwards are generated on the inner end surface and the outer end surface of the ceramic insulator 1 and inside the insulator, welding holes are generated in the sealing hole 6, and the cracks and the welding holes are likely to expand to form an air leakage channel in subsequent tests and use processes of products, so that the air leakage problem is caused. The utility model discloses a seal structure's beneficial effect lies in: (1) By adopting the sealing structure of the ceramic insulator 1 without metallization in the sealing hole 6, sealing is realized by metallizing the inner end face and the outer end face of the ceramic insulator 1 and welding the lead wire 2, the defect of uncontrollable cracks caused by welding stress between the lead wire 2 and the ceramic insulator 1 is avoided, and the long-term reliability of the product in subsequent use is further ensured. (2) When the inner end face and the outer end face of the ceramic insulator 1 are welded with the metal sealing rings, on one hand, the brazing stress can be dispersed to the ceramic insulator 1 and the sealing rings, and the sealing rings and the lead wires 2, so that the welding strength of the lead wires 2 and the ceramic insulator 1 is improved. (3) By optimizing the diameter of the sealing ring and the size of the metalized diameter of the inner end face and the outer end face of the ceramic insulator 1, the welding stress at the metalized edge is reduced, and the risk of stripping the metalized and ceramic is reduced.
In the prior art, when the metallized ceramic insulator 1 covered in the sealing hole 6 is welded with the lead 2, because the size precision of the sealing hole 6 is low, the assembly tolerance range of the sealing hole 6 and the lead 2 is large, under the condition of the same design size of welding flux, insufficient filling of welding flux in the sealing hole 6 of some ceramic insulators 1 is easily caused, welding holes are generated, and the defects of color change, coating loss and the like are caused during subsequent gold plating; the amount of the welding materials in the sealing hole 6 of some ceramic insulators 1 is large, the welding materials are accumulated on the lead 2, and even the operation difficulty and the bonding strength of the subsequent lead 2 bonding are influenced. And the utility model discloses a sealing hole does not have metallized ceramic insulator 1 sealing-in structure in 6, the sealing washer through two terminal surfaces inside and outside ceramic insulator 1 welds with lead wire 2, the sealing washer is high with the size machining precision of lead wire 2, assembly tolerance scope is little during both welds, use less solder can realize lead wire 2 and ceramic insulator 1 sealed, the solder volume is full even, the weld state uniformity is high, production efficiency and yield when improving follow-up product plating and bonding.
In order to ensure the sealing performance of the sealing structure, the metalized layers 5 on the inner end surface and the outer end surface of the ceramic insulator 1 are formed to have a thickness of not less than 5 μm. If the metallization layer 5 on the end face of the ceramic insulator 1 is coated on the whole end face, in order to realize insulation, the metallization layer 5 on the side face of the ceramic insulator 1 cannot be arranged on the edge of the inner end face and the edge of the outer end face of the ceramic insulator 1, and at the moment, the distance between the metallization layer 5 on the side face and the edge of the inner end face and the edge of the outer end face of the ceramic insulator 1 is at least 0.20mm.
When two end faces of the ceramic insulator 1 are metalized (i.e. when the metalized layer 5 is coated), the metalized layer 5 can be extended into the sealing hole 6 for local metallization, and the ceramic insulator 1 is sealed with the sealing ring and the lead 2 through the two end faces and the local metallization in the sealing hole 6. On one hand, the sealing length of the lead 2 and the ceramic insulator 1 is shortened, the sealing stress is reduced, and on the other hand, the welding strength of the lead 2 and the ceramic insulator 1 can be improved.
When two end faces of the ceramic insulator 1 are metalized, the two end faces can be fully metalized, the end face edges cannot be achieved in side surface metallization, the end face metallization aligning difficulty can be reduced, the operation efficiency is improved, and the product quality consistency is improved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a lead wire ceramic insulator seal structure which characterized in that, is including ceramic insulator, lead wire, interior sealing washer and the external seal circle that has the sealing hole, no metallization layer in the ceramic insulator sealing hole, the lead wire is installed in the sealing hole, ceramic insulator interior terminal surface and outer terminal surface all are equipped with metallization layer and metallization layer with the pin connection, interior sealing washer with the external seal circle all overlaps and locates the outer circumference of lead wire, interior sealing washer paste in the interior terminal surface of ceramic insulator, the external seal circle paste in the outer terminal surface of ceramic insulator.
2. The lead ceramic insulator seal structure of claim 1, wherein said inner seal ring and said outer seal ring are both metal seal rings and are both connectable to a metallization layer and said lead.
3. The lead ceramic insulator sealing structure of claim 1, wherein the metalized layers on the inner end surface and the outer end surface of the ceramic insulator are formed in a ring shape and are coaxially arranged with the sealing hole.
4. The lead ceramic insulator seal structure of claim 3, wherein said metalized layer outer diameter is greater than said lead outer diameter by more than 0.5 mm.
5. The lead wire ceramic insulator sealing structure of claim 3, wherein an outer diameter of the inner seal ring is less than an outer diameter of the metalized layer on the inner end face of the ceramic insulator by more than 0.2 mm.
6. The sealing structure of lead wire ceramic insulator according to claim 3, wherein the outer diameter of the outer sealing ring is more than 0.2mm smaller than the outer diameter of the metalized layer on the outer end face of the ceramic insulator.
7. The lead ceramic insulator seal structure according to claim 3, wherein an outer diameter of said ceramic insulator inner end face metallization layer is smaller than an outer diameter of said ceramic insulator outer end face metallization layer.
8. The lead ceramic insulator sealing structure according to claim 1, wherein the ceramic insulator is cylindrical and made of alumina ceramic, the sealing hole is located in the middle, the lead is made of zirconium-copper alloy, and the inner sealing ring and the outer sealing ring are made of kovar alloy.
9. The lead ceramic insulator sealing structure of claim 3, wherein a distance between the metalized layer on the inner end face of the ceramic insulator and the inner seal ring is greater than 0.1mm, and a distance between the metalized layer on the outer end face of the ceramic insulator and the outer seal ring is greater than 0.1mm.
10. The lead wire ceramic insulator sealing structure according to claim 2, wherein the inner seal ring is fixedly welded to the lead wire and the inner end face of the ceramic insulator, respectively, and the outer seal ring is fixedly welded to the lead wire and the outer end face of the ceramic insulator, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222330290.9U CN218159833U (en) | 2022-09-01 | 2022-09-01 | Lead wire ceramic insulator seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222330290.9U CN218159833U (en) | 2022-09-01 | 2022-09-01 | Lead wire ceramic insulator seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218159833U true CN218159833U (en) | 2022-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222330290.9U Active CN218159833U (en) | 2022-09-01 | 2022-09-01 | Lead wire ceramic insulator seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218159833U (en) |
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2022
- 2022-09-01 CN CN202222330290.9U patent/CN218159833U/en active Active
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