CN108723632B - Connecting structure of glass and kovar and low-temperature sintering method - Google Patents
Connecting structure of glass and kovar and low-temperature sintering method Download PDFInfo
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- CN108723632B CN108723632B CN201810471881.3A CN201810471881A CN108723632B CN 108723632 B CN108723632 B CN 108723632B CN 201810471881 A CN201810471881 A CN 201810471881A CN 108723632 B CN108723632 B CN 108723632B
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- kovar
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- alloy
- heat collecting
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
The invention discloses a glass and kovar connecting structure, which comprises a solar heat collecting pipe high-boron glass pipe and a kovar alloy pipe, wherein the kovar alloy pipe is inserted into the solar heat collecting pipe high-boron glass pipe; the micron kovar welding paste layer comprises Fe-Co-Ni alloy particles, a binder and 90-95% alcohol. The mass fractions of the components of the micron kovar welding paste layer are as follows: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder and 5-10 wt% of 90-95% alcohol. The technical scheme of the invention has the following beneficial effects: the invention creatively utilizes the low-temperature sintering method to take the micron Kovar solder paste as an intermediate material, realizes the glass Kovar sealing, and has the advantages of high-temperature reliability, no residual stress and good mechanical property.
Description
Technical Field
The invention relates to the technical field of solar high-temperature heat collecting tubes, in particular to a glass and kovar connecting structure and a low-temperature sintering method.
Background
At present, the known method for connecting glass and kovar alloy for a solar high-temperature heat collecting tube mainly adopts a high-temperature sealing technology, which is divided into matching sealing and non-matching sealing, wherein the glass and kovar joint is uniformly heated by flame at 1000 ℃ so that oxygen atoms are uniformly diffused on the metal surface to form metal oxide, and the chemical bond is close to the bond of silicon dioxide in glass, so that a better connection state can be achieved, but the defect is that the temperature is higher, and the glass tube is easy to crack due to residual stress formed after sealing.
The low-temperature sintering material is mainly used for connecting dissimilar metals, and the two are generally connected together by a sintering method, such as copper-aluminum, copper-silver and the like, however, a low-temperature sintering process for glass-metal connection does not exist, the glass-kovar connection can be realized at a low temperature of 180 ℃, and the low-temperature sintering material can be well used at a temperature of 400 ℃.
Disclosure of Invention
The invention aims to avoid the defects in the prior art and provides a connecting structure of glass and kovar and a low-temperature sintering method, so that the defects in the prior art are effectively overcome.
In order to achieve the purpose, the invention adopts the technical scheme that: a glass and kovar connecting structure comprises a solar heat collecting pipe high-boron glass pipe and a kovar alloy pipe, wherein the kovar alloy pipe is inserted into the solar heat collecting pipe high-boron glass pipe, a micron kovar solder paste layer is arranged at the joint of the outer side of the kovar alloy pipe, a copper plating layer is arranged at the joint of the inner side of the solar heat collecting pipe high-boron glass pipe, and the micron kovar solder paste layer is connected with the copper plating layer;
the micron kovar welding paste layer comprises Fe-Co-Ni alloy particles, a binder and 90-95% alcohol.
The mass fractions of the components of the micron kovar welding paste layer are as follows: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder and 5-10 wt% of 90-95% alcohol.
Furthermore, the expansion coefficient of the high-boron glass tube is 3.3 Shi 0.1X 10-6/K, and the expansion coefficient of the kovar alloy is 4.0 Shi 0.1X 10-6/K.
Further, the binder is acetone.
Further, the particle size of the Fe-Co-Ni alloy particles is 20-50 mu m.
A low-temperature sintering method for manufacturing the glass and kovar connecting structure comprises the following steps:
the method comprises the following steps: uniformly mixing Fe-Co-Ni alloy particles with a binder, adding 90-95% alcohol, and uniformly stirring to prepare micron kovar solder paste;
step two: removing the surface oxide film at the joint of the high-boron glass tube of the solar heat collecting tube and the kovar alloy tube;
step three: copper plating is carried out on the joint of the inner sides of the high-boron glass tubes of the solar heat collecting tubes to form the high-boron glass tubes of the solar heat collecting tubes with copper plating layers;
step four: coating micron kovar soldering paste on the joint outside the kovar alloy to form the kovar alloy with a micron kovar soldering paste layer;
step five: inserting the kovar alloy with the micron kovar paste layer, which is prepared in the fourth step, into the high-boron glass tube of the solar heat collecting tube with the copper plating layer;
step six: putting the product obtained in the fifth step into an oven, and preheating for 10-20 minutes at 50-70 ℃; after preheating, heating to 100 ℃, and preserving heat for 30 minutes; finally, the temperature is increased to 180 ℃, and the temperature is kept for 30 minutes.
Further, in the third step, the thickness of the copper plating layer is 15-25 um.
Further, in step four, the thickness of the micron kovar paste layer is 90-110 um.
Further, in the fifth step, the kovar alloy with the micron kovar paste layer is inserted into the high-boron glass tube of the solar heat collecting tube with the copper plating layer for 4.5-5.5 mm.
Further, in the fifth step, after the kovar alloy with the micron kovar paste layer is inserted into the high-boron glass tube of the solar heat collecting tube with the copper plating layer, the kovar alloy and the high-boron glass tube are rotated relatively, so that the micron kovar paste layer and the copper plating layer are uniformly distributed.
The technical scheme of the invention has the following beneficial effects:
(1) the invention creatively utilizes the low-temperature sintering method to take the micron Kovar solder paste as the intermediate material, realizes the glass-Kovar sealing, and has the advantages of high-temperature reliability, no residual stress and good mechanical property;
(2) the invention uses micron kovar solder paste as the intermediate layer, so that the expansion coefficient is consistent with that of glass and kovar, and cracking is avoided;
(3) compared with high-temperature sealing, the low-temperature sintering mode can effectively reduce the process temperature, and has low energy consumption and high efficiency.
Drawings
FIG. 1 is a schematic view of a structure of a high boron glass tube and a kovar alloy tube of a solar heat collecting tube according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-2, the connection structure for glass and kovar described in this embodiment includes a solar heat collecting tube high boron glass tube 1 and a kovar alloy tube 2, the kovar alloy tube 2 is inserted into the solar heat collecting tube high boron glass tube 1, a micron kovar solder paste layer 3 is disposed at a joint on an outer side of the kovar alloy tube 2, a copper plated layer 4 is disposed at a joint on an inner side of the solar heat collecting tube high boron glass tube 1, and the micron kovar solder paste layer 3 is connected to the copper plated layer 4;
the micron kovar welding paste layer 3 comprises Fe-Co-Ni alloy particles, a binder and 90-95% alcohol.
The mass fraction of each component of the micron kovar welding paste layer 3 is as follows: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder and 5-10 wt% of 90-95% alcohol.
The expansion coefficient of the high boron glass tube is 3.3 Shi 0.1X 10-6/K, and the expansion coefficient of the kovar alloy is 4.0 Shi 0.1X 10-6/K.
The binder is acetone.
The particle size of the Fe-Co-Ni alloy particles is 20-50 μm.
A low-temperature sintering method for manufacturing the glass and kovar connecting structure comprises the following steps:
the method comprises the following steps: uniformly mixing Fe-Co-Ni alloy particles with a binder, adding 90-95% alcohol, and uniformly stirring to prepare micron kovar solder paste;
step two: the method comprises the following steps of (1) carrying out surface oxide film removing treatment on the joint of the high-boron glass tube 1 of the solar heat collecting tube and the kovar alloy tube 2, wherein the surface oxide film removing treatment process comprises the following steps: cleaning with 5-15% hydrochloric acid, and polishing;
step three: copper plating is carried out on the joint of the inner sides of the solar heat collecting pipe high-boron glass pipes 1 to form the solar heat collecting pipe high-boron glass pipes 1 with copper plating layers, and the thickness of each copper plating layer is 20 microns;
step four: coating micron kovar soldering paste on the connecting position of the outer side of the kovar alloy 2 by using a soldering paste printer to form the kovar alloy with the micron kovar soldering paste layer 3, wherein the thickness of the micron kovar soldering paste is 100 um;
step five: inserting the kovar alloy with the micron kovar paste layer 3 prepared in the fourth step into the solar heat collecting pipe high-boron glass tube 1 with the copper plating layer by 5mm, and relatively rotating the kovar alloy and the high-boron glass tube to ensure that the micron kovar paste layer 3 and the copper plating layer 4 are uniformly distributed;
step six: putting the product obtained in the fifth step into an oven, and preheating for 10-20 minutes at 50-70 ℃; after preheating, heating to 100 ℃, and preserving heat for 30 minutes; finally, the temperature is increased to 180 ℃, and the temperature is kept for 30 minutes.
The micron kovar welding paste layer can be used for evaporating internal organic matters through low temperature, the nanoparticles are mutually agglomerated, the particles are driven to be connected with each other through chemical energy, the copper plating layer 4 and the kovar alloy 2 are diffused, the use temperature is low, so that the high-boron glass tube has no residual stress, the micron kovar welding paste layer is made of an elastic material, the difference of the linear expansion coefficient between the kovar alloy and the glass can be effectively relieved, and therefore, the cracking condition can not occur.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. A glass and kovar connecting structure is characterized by comprising a solar heat collecting pipe high-boron glass pipe and a kovar alloy pipe, wherein the kovar alloy pipe is inserted into the solar heat collecting pipe high-boron glass pipe;
the micron kovar welding paste layer comprises Fe-Co-Ni alloy particles, a binder and 90-95% alcohol;
the mass fractions of the components of the micron kovar welding paste layer are as follows: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder and 5-10 wt% of 90-95% alcohol.
2. A glass and kovar connection according to claim 1, wherein the high boron glass tube has an expansion coefficient of 3.3 ± 0.1 x 10 "6/K, and the kovar alloy has an expansion coefficient of 4.0 ± 0.1 x 10" 6/K.
3. A glass and kovar attachment according to claim 1, wherein said adhesive is acetone.
4. The connecting structure of glass and kovar according to claim 1, wherein the grain size of the Fe-Co-Ni alloy particles is 20-50 μm.
5. A low-temperature sintering method for making a glass-to-kovar joint according to any one of claims 1 to 4, comprising the steps of:
the method comprises the following steps: uniformly mixing Fe-Co-Ni alloy particles with a binder, adding 90-95% alcohol, and uniformly stirring to prepare micron kovar solder paste;
step two: removing the surface oxide film at the joint of the high-boron glass tube of the solar heat collecting tube and the kovar alloy tube;
step three: copper plating is carried out on the joint of the inner sides of the high-boron glass tubes of the solar heat collecting tubes to form the high-boron glass tubes of the solar heat collecting tubes with copper plating layers;
step four: coating micron kovar soldering paste on the joint outside the kovar alloy to form the kovar alloy with a micron kovar soldering paste layer;
step five: inserting the kovar alloy with the micron kovar paste layer, which is prepared in the fourth step, into the high-boron glass tube of the solar heat collecting tube with the copper plating layer;
step six: putting the product obtained in the fifth step into an oven, and preheating for 10-20 minutes at 50-70 ℃; after preheating, heating to 100 ℃, and preserving heat for 30 minutes; finally, the temperature is increased to 180 ℃, and the temperature is kept for 30 minutes.
6. The low-temperature sintering method according to claim 5, wherein the thickness of the copper plating layer in step three is 15 to 25 um.
7. The low temperature sintering method of claim 5 wherein in step four, the thickness of the layer of micron kovar paste is 90-110 um.
8. The low-temperature sintering method of claim 5, wherein in step five, the kovar alloy with the micron kovar paste layer is inserted into the high-boron glass tube of the solar heat collecting tube with the copper-plated layer for 4.5-5.5 mm.
9. The low-temperature sintering method of claim 5, wherein in the fifth step, after the kovar alloy with the micron kovar paste layer is inserted into the high-boron glass tube of the solar heat collecting tube with the copper plating layer, the kovar alloy and the high-boron glass tube are relatively rotated, so that the micron kovar paste layer and the copper plating layer are uniformly distributed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810471881.3A CN108723632B (en) | 2018-05-17 | 2018-05-17 | Connecting structure of glass and kovar and low-temperature sintering method |
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| CN201810471881.3A CN108723632B (en) | 2018-05-17 | 2018-05-17 | Connecting structure of glass and kovar and low-temperature sintering method |
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| CN108723632B true CN108723632B (en) | 2021-02-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101708964A (en) * | 2009-11-26 | 2010-05-19 | 南京工业大学 | Glass and metal vacuum brazing process |
| CN102922071A (en) * | 2012-10-25 | 2013-02-13 | 哈尔滨工业大学 | Method for preparing low-temperature interconnection/high-temperature serving joints by using nano intermetallic compound particles |
| CN103985651A (en) * | 2014-05-12 | 2014-08-13 | 哈尔滨工业大学 | Method for rapidly connecting activated metal surface and micro-nano connection material at low temperature |
| CN105200269A (en) * | 2015-11-09 | 2015-12-30 | 东方电气集团东方汽轮机有限公司 | Interlayer alloy as well as preparation method and application method thereof |
| CN204987517U (en) * | 2015-07-30 | 2016-01-20 | 河北光源太阳能有限公司 | Glass - metal solar vacuum heat collection tube |
| KR20170102445A (en) * | 2017-08-28 | 2017-09-11 | 덕산하이메탈(주) | Solder powder with exothermic and amorphous characteristics manufacture method and solder paste manufacture method and solder paste using low temperature bonding method |
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2018
- 2018-05-17 CN CN201810471881.3A patent/CN108723632B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708964A (en) * | 2009-11-26 | 2010-05-19 | 南京工业大学 | Glass and metal vacuum brazing process |
| CN102922071A (en) * | 2012-10-25 | 2013-02-13 | 哈尔滨工业大学 | Method for preparing low-temperature interconnection/high-temperature serving joints by using nano intermetallic compound particles |
| CN103985651A (en) * | 2014-05-12 | 2014-08-13 | 哈尔滨工业大学 | Method for rapidly connecting activated metal surface and micro-nano connection material at low temperature |
| CN204987517U (en) * | 2015-07-30 | 2016-01-20 | 河北光源太阳能有限公司 | Glass - metal solar vacuum heat collection tube |
| CN105200269A (en) * | 2015-11-09 | 2015-12-30 | 东方电气集团东方汽轮机有限公司 | Interlayer alloy as well as preparation method and application method thereof |
| KR20170102445A (en) * | 2017-08-28 | 2017-09-11 | 덕산하이메탈(주) | Solder powder with exothermic and amorphous characteristics manufacture method and solder paste manufacture method and solder paste using low temperature bonding method |
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| CN108723632A (en) | 2018-11-02 |
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Effective date of registration: 20221201 Address after: 100089 room 916, scientific research building, No.61 Zhichun Road, Haidian District, Beijing Patentee after: BEIJING TRX SOLAR TECHNOLOGY Co.,Ltd. Address before: 061000 No.29, East Jilin Avenue, high tech Industrial Development Zone, Cangzhou City, Hebei Province Patentee before: CANGZHOU TRX SOLAR TECHNOLOGY Co.,Ltd. |
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