CN211438596U - Gold-tin solder laser attachment assembly of ceramic cover plate - Google Patents
Gold-tin solder laser attachment assembly of ceramic cover plate Download PDFInfo
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- CN211438596U CN211438596U CN201922376321.2U CN201922376321U CN211438596U CN 211438596 U CN211438596 U CN 211438596U CN 201922376321 U CN201922376321 U CN 201922376321U CN 211438596 U CN211438596 U CN 211438596U
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Abstract
The utility model discloses a laser adhesion assembly of a gold-tin solder of a ceramic cover plate, which comprises a lower module and an upper module matched with the lower module, wherein the center of the lower module is provided with a lower ceramic cover plate positioning groove; a welding point is arranged at the position of the gold-tin welding ring close to the edge, and a laser welding gun moving up and down is arranged above the welding point; the upper module is characterized in that an upper ceramic cover plate accommodating groove for accommodating a ceramic cover plate is formed in the middle of the upper module, and when the lower module and the upper module are matched and assembled, the outer edge of the upper ceramic cover plate accommodating groove is in matched contact with the gold-tin welding ring. Through using this application the subassembly, can be before the encapsulation, through ceramic cover plate constant head tank with ceramic cover plate and gold tin welding ring position accurate positioning down to the laser spot welding mode is attached to, can guarantee the position precision, in follow-up encapsulation once the paster can, improve machining efficiency and machining precision, avoid appearing bad phenomena such as gas leakage.
Description
Technical Field
The utility model relates to a gold tin solder laser of ceramic apron adheres to subassembly.
Background
In the packaging process of the existing optical communication chip, a ceramic cover plate, gold-tin solder and the like are required to be matched with a tube shell for low-temperature sintering and sealing, and in the process, the ceramic cover plate and the gold-tin solder are subjected to fractional chip mounting operation, so that the chip mounting frequency is increased, the cost is increased, and secondly, the chip mounting positioning precision is low for multiple times, so that the cover plate is deviated after the welding is finished, the position of the solder is also easily inaccurate, and the air leakage is caused. There is a need in the art for a laser attachment assembly for gold-tin solder that can accurately attach gold-tin solder to a ceramic cover plate on a ceramic substrate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect that exists among the prior art, provide one kind can be with the accurate gold tin solder laser of attaching to the ceramic cover plate on ceramic substrate of gold tin solder attach to the subassembly.
In order to achieve the purpose, the technical scheme of the utility model is to provide a gold-tin solder laser attachment assembly of a ceramic cover plate, which comprises a lower module and an upper module matched with the lower module for use, wherein the center of the lower module is provided with a lower ceramic cover plate positioning groove, and the ceramic cover plate and a gold-tin welding ring are sequentially placed in the lower ceramic cover plate positioning groove; the outer edge of the ceramic cover plate and/or the outer edge of the gold-tin welding ring is matched and positioned with the inner edge of the positioning groove of the lower ceramic cover plate;
a welding point is arranged at the position of the gold-tin welding ring close to the edge, and a laser welding gun moving up and down is arranged above the welding point;
the upper module is characterized in that an upper ceramic cover plate accommodating groove for accommodating a ceramic cover plate is formed in the middle of the upper module, and when the lower module and the upper module are matched and assembled, the outer edge of the upper ceramic cover plate accommodating groove is in matched contact with the gold-tin welding ring.
Through using this application the subassembly, can be before the encapsulation, through ceramic cover plate constant head tank with ceramic cover plate and gold tin welding ring position accurate positioning down to the laser spot welding mode is attached to, can guarantee the position precision, in follow-up encapsulation once the paster can, improve machining efficiency and machining precision, avoid appearing bad phenomena such as gas leakage.
Preferably, the ceramic cover plate comprises a middle ceramic plate core, and a nickel plating layer and a gold plating layer which are formed through vacuum coating; a positioning boss is arranged in the middle of the ceramic cover plate, and a cover plate welding ring area is arranged at the periphery of the positioning boss; and the ring hole in the middle of the gold-tin welding ring is matched and positioned with the positioning boss. By the design, the gold-tin welding ring can be positioned firstly through the positioning boss, and the positioning precision is further improved.
Preferably, the outer edge of the upper ceramic cover plate accommodating groove is a downward convex blank holder, and the depth of the upper ceramic cover plate accommodating groove is greater than the thickness of the positioning boss; when the lower module and the upper module are matched for die assembly, the edge pressing presses the gold-tin welding ring tightly in the welding ring area of the cover plate; gold-tin slurry is arranged between the gold-tin welding ring and the cover plate welding ring area, and the position where the gold-tin slurry is attached is matched with the welding point. Due to the design, the gold-tin welding ring can be tightly pressed in the welding ring area of the cover plate through the blank pressing before welding, so that the welding is smoothly carried out, and the insufficient welding is avoided. Through set up gold tin thick liquids between gold tin welding ring and the apron welding ring region of welding point lower part, can be better with both through gold tin thick liquids bond, even under the prerequisite that has the cooperation gap between gold tin welding ring and apron welding ring region, still can be through gold tin thick liquids conduction laser heat, realize the electric welding, guarantee zero rosin joint.
Preferably, a pressurizing device is arranged at the upper part of the upper module. Such a design is a further optimization of the scheme.
Preferably, the ceramic cover plate and the gold-tin welding ring are rectangular, and the welding points are arranged at four corners of the gold-tin welding ring; the lower ceramic cover plate positioning groove is also rectangular, and four corners of the lower ceramic cover plate positioning groove are outwards expanded to form an arc-shaped welding groove. Due to the design, an operable area is designed at the periphery of the welding point, so that the interference with the groove body is avoided.
Preferably, the upper module is in a rectangular block shape, and arc-shaped notches are formed in four corners of the upper module; when the lower module and the upper module are matched for die assembly, the arc-shaped notch and the welding groove are matched for forming a welding operation space area. An operable area is designed at the periphery of the welding point to avoid interference with the groove body.
In order to deepen the understanding of the technical scheme of the laser attachment assembly of the gold-tin solder of the ceramic cover plate, the laser attachment method of the gold-tin solder of the matched ceramic cover plate is disclosed, the laser attachment assembly of the gold-tin solder of the ceramic cover plate is used, and the laser attachment method comprises the following steps:
step one, forming a ceramic cover plate: sequentially obtaining a nickel plating layer and a gold plating layer on the ceramic cover plate in a vacuum coating mode, wherein the thickness of the nickel plating layer is 3-8 mu m, and the thickness of the gold plating layer is 0.5-1.8 mu m;
step two, forming a gold-tin welding ring: pressing the AU80SN20 alloy cast ingot into a foil strip, and stamping the foil strip to obtain a gold-tin welding ring matched with the ceramic cover plate in size; the thickness of the gold-tin welding ring is 50-200 μm;
thirdly, placing a component, and positioning the ring hole in the middle of the gold-tin welding ring in a matching way with the positioning boss; the ceramic cover plate and the lower ceramic cover plate positioning groove are matched and positioned; the lower module and the upper module are matched to be matched, and the edge pressing presses the gold-tin welding ring to the cover plate welding ring area;
fourthly, performing laser spot welding, namely using a laser welding gun to perform operation on a welding point, and welding and attaching four corners of the gold-tin welding ring and four corners of the ceramic cover plate;
and fifthly, opening the mould for detection.
By the method, the ceramic cover plate and the gold-tin welding ring attachment assembly with high position precision can be obtained, the times of surface mounting are reduced in subsequent packaging, and the processing efficiency and the effect are improved.
Preferably, the pressure applied by the pressure device to the upper mold block when the upper mold block and the lower mold block are clamped is 1 to 100N. By the design, the gold-tin welding ring can be tightly pressed in the welding ring area of the cover plate by the pressing edge.
Preferably, the operating parameters in the laser spot welding are as follows: the light spot size is 5-100 microns, the frequency is 10-80HZ, and the power is 10-300W. The design can ensure the smooth proceeding of laser welding and the welding effect.
Preferably, the area of the laser spot welded area is less than 0.2mm in diameter. The small welding area can ensure the appearance quality of welding, and the quality of subsequent reflow welding can not be influenced (the spot with large welding spot can cause excessive welding and cause empty welding).
Preferably, in the third step, before the gold-tin welding ring is positioned in a matched manner with the positioning boss, gold-tin slurry is attached to the four corners of the upper surface of the welding ring area of the cover plate, and after the gold-tin slurry is attached, the ring hole in the middle of the gold-tin welding ring is positioned in a matched manner with the positioning boss; and the position of the gold-tin paste is matched with the position of the welding point. Through the gold tin thick liquids that adhere to between gold tin welding ring and the apron welding ring region of welding point lower part, can be after the compound die, at the welding point position between apron welding ring region and the gold tin welding ring, guarantee the thermal conductivity of laser through the bonding of gold tin thick liquids, even under the prerequisite that has the cooperation gap between gold tin welding ring and apron welding ring region, still can be through gold tin thick liquids conduction laser heat, realize the electric welding, guarantee zero rosin joint.
Preferably, in the gold-tin paste, the weight ratio of the Au powder to the Sn powder is 80: 20, the percentage content of the organic solvent is 10-45%; the gold-tin paste is attached in a screen printing or dispensing manner; the amount of gold-tin paste attached per attachment site was 0.05-2 ml. Such a design is one embodiment of the gold-tin paste composition.
The utility model has the advantages and the beneficial effects that: through using this application the subassembly, can be before the encapsulation, through ceramic cover plate constant head tank with ceramic cover plate and gold tin welding ring position accurate positioning down to the laser spot welding mode is attached to, can guarantee the position precision, in follow-up encapsulation once the paster can, improve machining efficiency and machining precision, avoid appearing bad phenomena such as gas leakage.
Drawings
Fig. 1 is a schematic diagram of the separation state of the lower module and the upper module of the present invention;
FIG. 2 is a schematic view of the lower module structure of the present invention;
FIG. 3 is a schematic view of the upper module structure of the present invention;
FIG. 4 is a schematic view showing a lower mold block and an upper mold block in a closed state (in a plan view, a laser welding gun and a pressurizing device are omitted);
FIG. 5 is a schematic view (side view) of the welding operation structure of the present invention;
FIG. 6 is a schematic view of the separation structure of the ceramic cover plate and the Au-Sn welding ring of the present invention;
FIG. 7 is a schematic view of the structure of the gap between the ceramic cover plate and the Au-Sn welding ring of the present invention;
fig. 8 is a schematic structural view of the ceramic cover plate of the present invention before mold assembly after the gold-tin paste adheres to the ceramic cover plate and the gold-tin welding ring in step three under the condition of a gap existing between the ceramic cover plate and the gold-tin welding ring;
fig. 9 is a schematic structural diagram of the structure after the die assembly after the gold-tin paste adheres to the ceramic cover plate and the gold-tin welding ring in the third step of the present invention under the condition of the gap between the ceramic cover plate and the gold-tin welding ring.
In the figure: 1. a lower module; 2. an upper module; 3. a lower ceramic cover plate positioning groove; 5. a ceramic cover plate; 7. a gold-tin welding ring; 8. a welding point; 9. a laser welding gun; 10. an upper ceramic cover plate accommodating groove; 11. positioning the boss; 12. a cover plate weld ring area; 13. pressing edges; 14. a pressurizing device; 15. welding a groove; 16. an arc-shaped notch; 17. gold tin paste; 18. a gap.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in figures 1 to 9 of the drawings,
example 1
A laser attachment assembly for gold-tin solder of a ceramic cover plate 5 comprises a lower module 1 and an upper module 2 matched with the lower module 1, wherein a lower ceramic cover plate positioning groove 3 is formed in the center of the lower module 1, and the ceramic cover plate 5 and a gold-tin welding ring 7 are sequentially placed in the lower ceramic cover plate positioning groove 3; the outer edge of the ceramic cover plate 5 and/or the outer edge of the gold-tin welding ring 7 is matched and positioned with the inner edge of the lower ceramic cover plate positioning groove 3;
a welding point 8 is arranged at the position, close to the edge, of the gold-tin welding ring 7, and a laser welding gun 9 which moves up and down is arranged above the welding point 8;
the middle part of the upper module 2 starts to be provided with an upper ceramic cover plate accommodating groove 10 for accommodating a ceramic cover plate 5, and when the lower module 1 and the upper module 2 are matched and assembled, the outer edge of the upper ceramic cover plate accommodating groove 10 is in matched contact with the gold-tin welding ring 7.
The ceramic cover plate 5 comprises a middle ceramic plate core, and a nickel plating layer and a gold plating layer which are formed through vacuum coating; a positioning boss 11 is arranged in the middle of the ceramic cover plate 5, and a cover plate welding ring area 12 is arranged on the periphery of the positioning boss 11; and the ring hole in the middle of the gold-tin welding ring 7 is matched and positioned with the positioning boss 11.
The outer edge of the upper ceramic cover plate accommodating groove 10 is provided with a downward convex blank holder 13, and the depth of the upper ceramic cover plate accommodating groove 10 is larger than the thickness of the positioning boss 11; when the lower module 1 and the upper module 2 are matched for die assembly, the edge pressing 13 presses the gold-tin welding ring 7 tightly in the cover plate welding ring area 12. Gold-tin paste 17 is arranged between the gold-tin welding ring 7 and the cover plate welding ring area 12, and the position where the gold-tin paste 17 is attached is matched with the welding point 8.
The upper part of the upper module 2 is provided with a pressurizing device 14. The pressurizing device 14 is a spring or a cylinder, etc.
The ceramic cover plate 5 and the gold-tin welding ring 7 are both rectangular, and the welding points 8 are arranged at four corners of the gold-tin welding ring 7; the lower ceramic cover plate positioning groove 3 is also rectangular, and four corners of the lower ceramic cover plate positioning groove are outwards expanded to form arc-shaped welding grooves 15.
The upper module 2 is in a rectangular block shape, and arc-shaped notches 16 are formed in four corners of the upper module 2; when the lower module 1 and the upper module 2 are matched for die assembly, the arc-shaped notch 16 is matched with the welding groove 15 to form a welding operation space area.
Example 2
A gold-tin solder laser attachment method of a ceramic cover plate 5, using a gold-tin solder laser attachment assembly to the ceramic cover plate 5 of example 1, comprising the steps of:
first, forming the ceramic cover plate 5: sequentially obtaining a nickel plating layer and a gold plating layer on the ceramic cover plate 5 in a vacuum coating mode, wherein the thickness of the nickel plating layer is 3-8 mu m, and the thickness of the gold plating layer is 0.5-1.8 mu m;
secondly, forming a gold-tin welding ring 7: pressing the AU80SN20 alloy cast ingot into a foil strip, and stamping the foil strip to obtain a gold-tin welding ring 7 with the size matched with that of the ceramic cover plate 5; the thickness of the gold-tin welding ring 7 is 50-200 μm;
thirdly, placing a component, and enabling an annular hole in the middle of the gold-tin welding ring 7 to be matched and positioned with the positioning boss 11; the ceramic cover plate 5 is matched and positioned with the lower ceramic cover plate positioning groove 3; the lower module 1 and the upper module 2 are matched to be matched, and the edge pressing 13 presses the gold-tin welding ring 7 to the cover plate welding ring area 12 (so that the gold-tin welding ring 7 at the positions of the four welding points 8 is tightly contacted with the cover plate welding ring area 12 without any gap);
fourthly, performing laser spot welding, namely performing operation on a welding point 8 by using a laser welding gun 9, and welding and attaching four corners of the gold-tin welding ring 7 and four corners of the ceramic cover plate 5; preferably, the German IPG-QCW150W multimode laser is a laser welder which combines a SCANLAB galvanometer with 20mm incident light spot, a field lens with 20mm incident light spot and F160mm focal length.
And fifthly, opening the mould for detection.
When the upper module 2 and the lower module 1 are clamped, the pressure exerted by the pressure device 14 on the upper module 2 is 1-100 newtons.
The operating parameters during laser spot welding are that the spot size is 5-100 microns, the frequency is 10-80HZ, and the power is 10-300 watts.
The area of the laser spot welding area is less than 0.2mm in diameter.
Example 3
Further optimizing the embodiment 2, in the third step, before the gold-tin welding ring 7 is adapted and positioned with the positioning boss 11, gold-tin paste 17 is attached to the four corners of the upper surface of the cover plate welding ring area 12, and after the gold-tin paste 17 is attached, the ring hole in the middle of the gold-tin welding ring 7 is adapted and positioned with the positioning boss 11; and the position 17 of the gold-tin paste is matched with the position of the welding point 8.
In the gold-tin paste 17, the weight ratio of Au powder to Sn powder is 80: 20, the percentage content of the organic solvent is 10-45%; the gold tin paste 17 is attached in a screen printing or dispensing manner; the amount of gold tin paste 17 attached per attachment site was 0.05 to 2 ml.
Preferably, the gold-tin paste is prepared by the following method: firstly, gold tin powder (with the particle size of 10nm-5 microns) or Au powder and Sn powder are mixed according to the weight ratio of 80: 20 mixing into metal powder;
adding the powder, the plasticizer and the organic solvent into a mixer, wherein the percentage content of the organic solvent is 10-45%; the powder, the plasticizer and the organic solvent are hermetically stirred at the temperature of 35-50 ℃, the rotating speed of a mixer is 205-315 revolutions per minute, the mixing time is 24-120h, slurry with reasonable viscosity is obtained, and then the slurry is vacuumized to remove bubbles.
Preferably, the plasticizer comprises PVB and ethyl acetate.
Preferably, the organic solvent includes butanone, alcohol, and acetone.
Before the gold-tin welding ring 7 is matched and positioned with the positioning boss 11, the gold-tin slurry 17 is dropwise attached to the four corners of the upper surface of the cover plate welding ring area 12, after die assembly, the gold-tin welding ring 7 is tightly pressed on the cover plate welding ring area 12 by the pressing edge 13, the dropwise gold-tin slurry 17 is extruded to be in a thin layer shape, the upper surface and the lower surface are respectively bonded with the lower surface of the gold-tin welding ring 7 and the upper surface of the cover plate welding ring area 12, and under the condition that the gold-tin welding ring 7 is locally deformed, the thermal conductivity of the gold-tin slurry 17 and the ceramic cover plate 5 can still be relied on;
in practice, it is found that in the absence of the gold-tin paste 17, in the case of local deformation of the gold-tin ring 7 at the lower portion of the welding point 8, there is a gap 18 between the gold-tin ring 7 at the lower portion of the welding point 8 and the cover plate welding ring region 12, and in the later laser spot welding, heat cannot be conducted to the upper surface of the cover plate welding ring region 12 through the gap, resulting in a cold joint.
In this application, to the increase and the use of gold tin thick liquids 17, fine solution above-mentioned risk, can accomplish zero rosin joint.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A gold-tin solder laser attachment assembly of a ceramic cover plate is characterized in that: the device comprises a lower module and an upper module matched with the lower module, wherein a lower ceramic cover plate positioning groove is formed in the center of the lower module, and a ceramic cover plate and a gold-tin welding ring are sequentially placed in the lower ceramic cover plate positioning groove; the outer edge of the ceramic cover plate and/or the outer edge of the gold-tin welding ring is matched and positioned with the inner edge of the positioning groove of the lower ceramic cover plate;
a welding point is arranged at the position of the gold-tin welding ring close to the edge, and a laser welding gun moving up and down is arranged above the welding point;
the upper module is characterized in that an upper ceramic cover plate accommodating groove for accommodating a ceramic cover plate is formed in the middle of the upper module, and when the lower module and the upper module are matched and assembled, the outer edge of the upper ceramic cover plate accommodating groove is in matched contact with the gold-tin welding ring.
2. The ceramic lid au-sn-solder laser attachment assembly of claim 1, wherein: the ceramic cover plate comprises a middle ceramic plate core, and a nickel plating layer and a gold plating layer which are formed through vacuum coating; a positioning boss is arranged in the middle of the ceramic cover plate, and a cover plate welding ring area is arranged at the periphery of the positioning boss; and the ring hole in the middle of the gold-tin welding ring is matched and positioned with the positioning boss.
3. The ceramic lid au-sn-solder laser attachment assembly of claim 2, wherein: the outer edge of the upper ceramic cover plate accommodating groove is a downward convex blank holder, and the depth of the upper ceramic cover plate accommodating groove is greater than the thickness of the positioning boss; when the lower module and the upper module are matched for die assembly, the edge pressing presses the gold-tin welding ring tightly in the welding ring area of the cover plate; gold-tin slurry is arranged between the gold-tin welding ring and the cover plate welding ring area, and the position where the gold-tin slurry is attached is matched with the welding point.
4. A ceramic cover plate au-sn-solder laser attachment assembly, as claimed in claim 3, wherein: and a pressurizing device is arranged at the upper part of the upper module.
5. A ceramic cover plate au-sn-solder laser attachment assembly, as claimed in claim 3, wherein: the ceramic cover plate and the gold-tin welding ring are rectangular, and the welding points are arranged at four corners of the gold-tin welding ring; the lower ceramic cover plate positioning groove is also rectangular, and four corners of the lower ceramic cover plate positioning groove are outwards expanded to form an arc-shaped welding groove.
6. The ceramic lid au-sn-solder laser attach assembly of claim 5, wherein: the upper module is in a rectangular block shape, and arc-shaped notches are formed in four corners of the upper module; when the lower module and the upper module are matched for die assembly, the arc-shaped notch and the welding groove are matched for forming a welding operation space area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922376321.2U CN211438596U (en) | 2019-12-26 | 2019-12-26 | Gold-tin solder laser attachment assembly of ceramic cover plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922376321.2U CN211438596U (en) | 2019-12-26 | 2019-12-26 | Gold-tin solder laser attachment assembly of ceramic cover plate |
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| Publication Number | Publication Date |
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| CN211438596U true CN211438596U (en) | 2020-09-08 |
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| CN201922376321.2U Active CN211438596U (en) | 2019-12-26 | 2019-12-26 | Gold-tin solder laser attachment assembly of ceramic cover plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799588A (en) * | 2022-06-07 | 2022-07-29 | 广东省索艺柏科技有限公司 | Resistance spot welding pre-packaging method for pre-formed cover plate with gold-tin welding ring |
-
2019
- 2019-12-26 CN CN201922376321.2U patent/CN211438596U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799588A (en) * | 2022-06-07 | 2022-07-29 | 广东省索艺柏科技有限公司 | Resistance spot welding pre-packaging method for pre-formed cover plate with gold-tin welding ring |
| CN114799588B (en) * | 2022-06-07 | 2024-04-26 | 合肥索思表面处理科技有限公司 | Resistance spot welding pre-packaging method for preformed cover plate attached with gold soldering ring |
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