CN113492245A - Nitrogen protection device for gold-tin sintering and constant-temperature eutectic machine with same - Google Patents
Nitrogen protection device for gold-tin sintering and constant-temperature eutectic machine with same Download PDFInfo
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- CN113492245A CN113492245A CN202110769360.8A CN202110769360A CN113492245A CN 113492245 A CN113492245 A CN 113492245A CN 202110769360 A CN202110769360 A CN 202110769360A CN 113492245 A CN113492245 A CN 113492245A
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- box body
- nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
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- Furnace Charging Or Discharging (AREA)
Abstract
The invention provides a gold-tin sintered nitrogen protection device and a constant-temperature eutectic machine with the same. The nitrogen protection device for gold-tin sintering comprises a protection box, two gas pipes, two dispersion shells and a negative sheet. The middle part of the box body of the protection box is provided with a through hole which penetrates through the box body from top to bottom, and the side walls of the two sides of the box body are respectively provided with an air inlet. The air delivery pipes are respectively communicated with one air inlet. The two dispersing shells are positioned in the box body and respectively close to one of the air inlets. The dispersing shell is provided with a plurality of air holes. The film is arranged outside the box body and is provided with an operation opening opposite to the through opening. When the gold and tin are sintered, the through port can be used for the chip to pass through and be placed above the tube shell, two nitrogen flows in the box body meet from the tube shell, and the tube shell and the chip are protected by nitrogen. The air holes on the dispersing shell can uniformly disperse the nitrogen to form a stable nitrogen flow. Because the bottom of the box body is provided with the bottom sheet and the two nitrogen flows in the box body meet from the pipe shell, the nitrogen protection can be provided for the pipe shell and the chip when the gold and tin are sintered.
Description
Technical Field
The invention belongs to the technical field of microelectronic assembly, and particularly relates to a gold-tin sintered nitrogen protection device and a constant-temperature eutectic machine with the same.
Background
In the microelectronic assembly technology, the gold-tin sintering has the characteristics of good performance, high joint strength and good wettability, so the gold-tin eutectic process is mostly adopted to realize the assembly of electronic devices. However, when the gold-tin sintering is used, if the sintering is carried out under the condition of no atmosphere protection, the solder is easily oxidized, so that the problem of solder accumulation and the phenomenon of solder delamination occur, and the welding quality is seriously influenced.
The production efficiency of the existing pulse type eutectic machine is lower. Compared with the pulse eutectic machine, the production efficiency of the constant-temperature eutectic machine is about 3 times that of the pulse eutectic machine, factors of the production efficiency and equipment cost are comprehensively considered, and enterprises urgently need to finish the gold-tin sintering process by using the constant-temperature eutectic machine. However, the heating part of the constant-temperature eutectic machine is of an unsealed structure, namely, the oxygen concentration of the heating part is high, so that the problem that the solder is seriously oxidized in the heating process is easily caused.
Disclosure of Invention
The invention aims to provide a gold-tin sintered nitrogen protection device capable of forming a stable nitrogen flow and a constant-temperature eutectic machine with the same.
In order to achieve the purpose, the invention adopts the technical scheme that: the invention provides a nitrogen protection device for gold-tin sintering, which is used for providing nitrogen protection when gold-tin sintering is carried out on a tube shell and a chip and comprises the following components:
the protection box is provided with a through hole which penetrates through the box body up and down in the middle of the box body, and air inlets are respectively arranged on the side walls of the two sides of the box body;
the two gas pipes are respectively communicated with one gas inlet and are used for conveying the nitrogen into the box body;
the two dispersing shells are positioned in the box body and respectively close to one of the air inlets; the dispersing shell is provided with a plurality of air holes for nitrogen to pass through, and the air holes can uniformly disperse the nitrogen at the dispersing shell so as to form a stable nitrogen flow which fills the box body; and
the bottom plate is arranged outside the box body and provided with an operation port which is opposite to the through port and used for positioning the tube shell;
during gold-tin sintering, the through opening can be used for the chip to pass through and be placed above the tube shell, and the two nitrogen flows in the box body meet from the tube shell and provide nitrogen protection for the tube shell and the chip.
In one possible implementation, the protection box includes:
the body is provided with a groove with an upward opening; and
and the cover plate is covered on the groove, so that the box body of the protection box can be formed.
In a possible implementation manner, the protective box further comprises a pressing clamp, wherein the pressing clamp comprises a connecting part connected with the protective box and a limiting part positioned on one side of the connecting part; the limiting part bends downwards to the inside of the operation opening in an inclined mode and is used for limiting the position of the pipe shell in the vertical direction when the pipe shell is located in the operation opening.
In a possible implementation manner, the limiting part is in a T shape with a width that is narrowed from being close to the connecting part to being far away from the connecting part.
In one possible implementation, the press jaw is a manganese steel press jaw.
In a possible implementation manner, the dispersing shell comprises a top plate and three side plates connected with the top plate, and the dispersing shell is buckled on the bottom wall of the box body and forms a sealed box-shaped structure with the side wall and the bottom wall of the box body.
In a possible implementation manner, the top plate of the dispersion shell has a certain distance with the top wall of the box body, the top plate of the dispersion shell is provided with a plurality of air holes, and the side plate of the dispersion shell opposite to the air inlet on the box body is provided with a plurality of air holes, so that nitrogen entering the box body flows through the dispersion shell and then flows in the upward direction in an inclined mode.
In a possible implementation manner, the shape of the operation opening is matched with the external shape of the pipe shell, and the size of the operation opening is 0.2mm larger than the external size of the pipe shell.
In a second aspect, the invention provides a constant temperature eutectic machine, comprising a nitrogen protection device for gold-tin sintering.
The nitrogen protection device for gold-tin sintering provided by the invention has the beneficial effects that: compared with the prior art, the plurality of air holes formed in the dispersing shell can uniformly disperse nitrogen at the dispersing shell, so that a stable nitrogen flow filling the box body can be formed. Because the protection box is provided with two air inlets, and the two air inlets are correspondingly provided with the gas conveying pipe and the dispersing shell, two stable nitrogen flows respectively flow into the box body from two sides. Because the box body bottom is equipped with the film and two strands of nitrogen gas flows in the box body meet from the tube, so when the chip passes through the opening and is placed in the tube top, when carrying out the gold tin sintering, can provide the nitrogen protection to tube and chip.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed 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 diagram of a nitrogen protection device for gold-tin sintering according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exploded structure of the nitrogen protection device for sintering Au and Sn in FIG. 1;
FIG. 3 is a schematic structural diagram of a front view of a gold-tin sintering process performed on a tube shell and a chip by using the nitrogen protection device for gold-tin sintering in FIG. 1;
fig. 4 is a schematic structural view of the press plier of fig. 2.
In the figure: 1. a protection box; 11. a box body; 12. a port; 13. an air inlet; 14. a body; 15. a cover plate; 2. a gas delivery pipe; 3. a dispersing shell; 31. air holes; 4. a negative film; 41. a working port; 5. pressing pliers; 51. a connecting portion; 52. a limiting part; 6. a pipe shell; 7. and (3) a chip.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, the present invention provides a gold-tin sintered nitrogen protection device and a constant temperature eutectic machine having the same. The nitrogen protection device for gold-tin sintering is used for providing nitrogen protection when gold-tin sintering is carried out on the tube shell 6 and the chip 7, and comprises a protection box 1, two gas conveying pipes 2, two dispersing shells 3 and a bottom sheet 4.
The middle part of the box body 11 of the protection box 1 is provided with a through hole 12 which penetrates up and down, and the side walls of two sides of the box body 11 are respectively provided with an air inlet 13. And the two gas conveying pipes 2 are respectively communicated with one gas inlet 13, and are used for conveying nitrogen into the box body 11. Two dispersion shells 3 are located in the box 11 and adjacent to one of the air inlets 13. The dispersing shell 3 is provided with a plurality of air holes 31 for nitrogen to pass through, and the air holes 31 can ensure that the nitrogen is uniformly dispersed at the dispersing shell 3 so as to form a stable nitrogen flow which fills the box body 11. The bottom plate 4 is arranged outside the box body 11, and the bottom plate 4 is provided with a working opening which is opposite to the through opening 12 and used for positioning the shell 6. During gold-tin sintering, the through opening 12 is accessible for the chip 7 and is placed above the envelope 6, and the two nitrogen flows in the capsule 11 meet at the envelope 6 and provide a nitrogen protection for the envelope 6 and the chip 7.
Compared with the prior art, the plurality of air holes 31 arranged on the dispersing shell 3 in the invention can ensure that the nitrogen is uniformly dispersed at the dispersing shell 3, so that a stable nitrogen flow which fills the box body 11 can be formed. Because the two air inlets 13 are arranged in the invention, and the air conveying pipe 2 and the dispersing shell 3 are respectively and correspondingly arranged at the two air inlets 13, two stable nitrogen flows respectively flow into the box body 11 from two sides, so that the high-speed nitrogen flows can be prevented from forming a vortex in the central area of the box body 11 and sucking air. The two nitrogen flows in the capsule 11 meet from the capsule 6 and during the gold-tin sintering the chip 7 is placed over the capsule 6 through the through opening 12, thus providing a nitrogen protection for the capsule 6 and the chip 7.
Referring to fig. 2, the protection box 1 includes a body 14 and a cover 15. Wherein the body 14 is provided with a groove with an upward opening. The cover 15 is covered on the groove to form the box body 11 of the protection box 1. The protection box 1 is arranged to be split, so that the processing and installation difficulty of the protection box 1 is reduced. Of course, the protective case 1 may be formed in one piece.
Referring to fig. 2 to 4, the nitrogen protection device for au-sn eutectic in the present embodiment further includes a pressing clamp 5. Wherein the pressing pliers 5 comprises a connecting part 51 connected with the protection box 1 and a limiting part 52 positioned at one side of the connecting part 51. Wherein, the limiting part 52 is bent obliquely downwards to the inside of the operation hole. When the pipe case 6 enters the operation opening, the limiting part 52 of the pressing pliers 5 can be pressed against the upper part of the pipe case 6, so that the position of the pipe case 6 in the vertical direction is limited. For the limit of the pipe shell 6 in the vertical direction, the displacement difference of the pipe shell 6 from the initial position to the final position after entering the operation opening can be controlled by the control unit.
Referring to fig. 4, in the present embodiment, the limiting portion 52 of the pressing pliers 5 is in a T shape with a width narrowed from the portion close to the connecting portion 51 to the portion far from the connecting portion 51, that is, when the limiting portion 52 presses the pipe shell 6, the contact area between the limiting portion 52 and the pipe shell 6 is small, so as to reduce the heat conduction area between the pressing pliers 5 and the pipe shell 6, and prevent the pressing pliers 5 from cooling the pipe shell 6 too much. Of course, the limiting portion 52 may have other forms as long as it can limit the tube housing 6.
In the present embodiment, the pressing jaw 5 is provided as a manganese steel pressing jaw 5. Because the manganese steel material has elasticity, when the pressing clamp is pressed and embedded against the pipe shell 6, the pressing clamp 5 can buffer the acting force between the pressing clamp 5 and the pipe shell 6 through elastic deformation. So that the pressing jaw 5 does not cause excessive stress to the envelope 6, i.e. does not affect the quality of the envelope 6 during sintering. The pressing pliers 5 can also be made of common steel, so long as the pressing pliers 5 and the pipe shell 6 are not damaged in the limiting process of the pipe shell 6.
Referring to fig. 2 and 3, the dispersing case 3 includes a top plate and three side plates connected to the top plate. During installation, the dispersing shell 3 is buckled on the bottom wall of the box body 11, and forms a sealed box-shaped structure with the side wall and the bottom wall of the box body 11. When the nitrogen gas entering from the gas inlet 13 flows through the dispersion case 3, since the dispersion case 3 is caught on the case bottom wall, that is, the dispersion case 3 does not form a downward nitrogen gas flow, the influence of the nitrogen gas flow on the temperature of the tube case 6 in the working port 41 is reduced.
In this embodiment, the top plate of the dispersing case 3 has a certain distance from the top wall of the case 11, the top plate of the dispersing case 3 is provided with a plurality of air holes 31, and the side plate of the dispersing case 3 opposite to the air inlet 13 on the case 11 is provided with a plurality of air holes 31. When the nitrogen gas enters from the gas inlet 13, the nitrogen gas flows through the dispersion housing 3 in an upward oblique direction, so that the external air can be prevented from entering the box body 11.
In this embodiment, the shape of the working opening is adapted to the outer shape of the cartridge 6, so that the cartridge 6 can enter the working opening. Wherein the external dimension of operation mouth size than tube 6 is 0.2mm for tube 6 can be more convenient get into the operation mouth, but the size of operation mouth should not be too big with the external dimension of tube 6 difference, if too big then can cause outside air can get into inside the tube 6, reduce the quality of tube 6 and chip 7 at the gold tin sintering.
The embodiment also provides a constant-temperature eutectic machine comprising the gold-tin sintered nitrogen protection device. During operation, the nitrogen protection device for gold-tin sintering is firstly installed on a constant-temperature eutectic machine, and then the constant-temperature eutectic machine is started. The main working process is as follows:
the first step is as follows: the pipe shell 6 is conveyed to the port 12 of the box body 11 of the protection box 1, the heating platform on the thermostat drives the pipe shell 6 to ascend, and the pipe shell 6 is jacked to the operation port.
The second step is that: the chip 7 is placed over the package 6 through the through opening 12. In order to ensure that the chip 7 can be accurately placed above the package 6 through the through opening 12, the through opening 12 is set free from the mounting area and the identification point. Wherein gold-tin solder is pre-arranged between the package 6 and the chip 7.
The third step: after the tube shell 6 and the chip 7 are placed, the heating table below the tube shell 6 heats the tube shell 6, and gold-tin sintering of the tube shell 6 and the chip 7 is completed.
The fourth step: after the gold-tin sintering of the package 6 and the chip 7 is completed, the package 6 and the chip 7 are withdrawn from the working opening 41 and transported to the next process.
The fifth step: the above process is repeated.
Since the constant temperature eutectic machine in the embodiment is provided with the nitrogen protection device for gold-tin sintering, when the constant temperature eutectic machine is used for performing a gold-tin sintering process, the production efficiency is improved, and oxidation of gold-tin solder does not occur. Therefore, the constant-temperature eutectic machine in the embodiment not only improves the quality of products, but also reduces the manufacturing cost. In the constant temperature eutectic machine according to the present embodiment, the chip 7 and the ceramic substrate, the capacitor and the case 6, and the capacitor and the ceramic substrate may be sintered with gold and tin.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A nitrogen protection device for gold-tin sintering is used for providing nitrogen protection when gold-tin sintering is carried out on a tube shell and a chip, and is characterized by comprising the following components:
the protection box is provided with a through hole which penetrates through the box body up and down in the middle of the box body, and air inlets are respectively arranged on the side walls of the two sides of the box body;
the two gas pipes are respectively communicated with one gas inlet and are used for conveying the nitrogen into the box body;
the two dispersing shells are positioned in the box body and respectively close to one of the air inlets; the dispersing shell is provided with a plurality of air holes for nitrogen to pass through, and the air holes can uniformly disperse the nitrogen at the dispersing shell so as to form a stable nitrogen flow which fills the box body; and
the bottom plate is arranged outside the box body and provided with an operation port which is opposite to the through port and used for positioning the tube shell;
during gold-tin sintering, the through opening can be used for the chip to pass through and be placed above the tube shell, and the two nitrogen flows in the box body meet from the tube shell and provide nitrogen protection for the tube shell and the chip.
2. The gold-tin sintered nitrogen shield of claim 1, wherein said shield case comprises:
the body is provided with a groove with an upward opening; and
and the cover plate is covered on the groove, so that the box body of the protection box can be formed.
3. The gold-tin sintered nitrogen protection device of claim 1, further comprising a pressing clamp, wherein the pressing clamp comprises a connecting part connected with the protection box and a limiting part positioned on one side of the connecting part; the limiting part bends downwards to the inside of the operation opening in an inclined mode and is used for limiting the position of the pipe shell in the vertical direction when the pipe shell is located in the operation opening.
4. The Au-Sn sintered nitrogen protection device of claim 3, wherein the limiting part is in a T shape with a width narrowed from the part close to the connecting part to the part far from the connecting part.
5. The Au-Sn sintered nitrogen shield as claimed in claim 4, wherein said press tongs are manganese steel press tongs.
6. The Au-Sn sintered nitrogen protection device as claimed in claim 1, wherein said dispersion shell comprises a top plate and three side plates connected with said top plate, said dispersion shell is buckled on the bottom wall of said box body, and forms a sealed box-like structure with the side wall and the bottom wall of said box body.
7. The Au-Sn sintered nitrogen protection device as claimed in claim 6, wherein a top plate of said dispersion shell is spaced from a top wall of said box body, a plurality of said air holes are opened on said top plate of said dispersion shell, and a plurality of said air holes are opened on a side plate of said dispersion shell opposite to said air inlet on said box body, so that nitrogen gas entering said box body flows obliquely upward after passing through said dispersion shell.
8. The Au-Sn sintered nitrogen shield of claim 1, wherein said access opening is shaped to conform to the external shape of said envelope and said access opening is 0.2mm larger than the external dimensions of said envelope.
9. A thermostatic eutectic machine, characterized by comprising a gold-tin sintered nitrogen shield as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110769360.8A CN113492245B (en) | 2021-07-07 | 2021-07-07 | Nitrogen protection device for gold-tin sintering and constant-temperature eutectic machine with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110769360.8A CN113492245B (en) | 2021-07-07 | 2021-07-07 | Nitrogen protection device for gold-tin sintering and constant-temperature eutectic machine with same |
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| CN113492245A true CN113492245A (en) | 2021-10-12 |
| CN113492245B CN113492245B (en) | 2022-07-29 |
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| US20050095749A1 (en) * | 2002-04-29 | 2005-05-05 | Mathias Krellmann | Device for protecting a chip and method for operating a chip |
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| CN111037025A (en) * | 2019-12-26 | 2020-04-21 | 盐城海荣炉业科技有限公司 | Brazing furnace transmission nitrogen protection device |
| CN112018003A (en) * | 2020-09-02 | 2020-12-01 | 深圳新益昌科技股份有限公司 | Automatic eutectic machine and eutectic method |
| CN212823256U (en) * | 2020-06-30 | 2021-03-30 | 武汉六九传感科技有限公司 | Heating table with gas protection |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2311819A1 (en) * | 1998-10-29 | 2000-05-11 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Georges Claude | Apparatus and method for inerting a wave soldering installation |
| US20050095749A1 (en) * | 2002-04-29 | 2005-05-05 | Mathias Krellmann | Device for protecting a chip and method for operating a chip |
| WO2017049511A1 (en) * | 2015-09-23 | 2017-03-30 | 广州硅能照明有限公司 | Vacuum reacting force welding method and device thereof |
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