CN105254191B - A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method - Google Patents
A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method Download PDFInfo
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- CN105254191B CN105254191B CN201510672728.3A CN201510672728A CN105254191B CN 105254191 B CN105254191 B CN 105254191B CN 201510672728 A CN201510672728 A CN 201510672728A CN 105254191 B CN105254191 B CN 105254191B
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- kovar alloy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention discloses a kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method for belonging to glass-to-metal seal technical field.The method for sealing is used in room temperature to kovar alloys and glass tube of 450 DEG C of temperature range coefficients of expansion difference no more than 15%, by the use of the glass dust of the coefficient of expansion therebetween as transition material, realizes the seal of glass and metal.The method for sealing has higher mechanical strength and reliability, and mode of operation is simple, can be achieved to cut down and glass batch sealing-in；Cost is cheap, suitable for medium temperature field of solar evacuated collector tube.
Description
Technical field
The invention belongs to glass-to-metal seal technical field, more particularly to a kind of middle temperature solar vacuum heat-collecting tube glass
Metal sealing method.
Background technology
Middle temperature solar vacuum heat-collecting tube is by stainless steel mesotube and glass outer sleeve pipe with coating for selective absorption
Composition, it is the core component of solar energy medium temperature collecting system, its reliability and optical property have been largely fixed whole collection
The efficiency of hot systems.In order to protective seletion absorber coatings and reduce heat collecting pipe heat waste, it is necessary to by mesotube and glass bushing it
Between vacuumize, and thermal-collecting tube service life requirement be up to 20 years as long as, this just proposes very high to glass-to-metal sealing quality
Requirement.
The method that traditional glass-metal sealing process uses flame sealing, this method typically require metal and glass swelling
Coefficient matches (error is less than 6%) very much, and process for sealing difficulty is larger, and used glass transmission rate, chemical stability
High borosilicate hard glass can be below etc. universality；Another route of flame sealing is using the non-matching glass of the coefficient of expansion
Glass and metal, but metal needs are thinned to below 0.1mm could discharge stress of sealing, this method for sealing due to metal thickness too
It is thin, closure mechanical strength can be caused to substantially reduce, reliability is still needed further checking.
Except flame sealing method, patent CN1262248A proposes a kind of glass metal hot press sealing process, that is, utilizes
The hot pressing encapsulation method of solid State Welding reaches the requirement of vacuum tight by together with glass and metal sealing.It is characterized in that welding
Carried out under conditions of heating is pressurizeed, welding temperature is generally 0.7-0.9 times of solder melt point.This method uses in low
Solder is mainly lead, and maximum operation (service) temperature is less than 200 DEG C, so the vacuum heat collection pipe of lead hot-press sealing can only apply warm photo-thermal profit
Use field.The hot-press sealing technology later stage has attempted aluminium as solder, but residual stress is larger after sealing-in, and yield rate is than relatively low.
A kind of method using more piece glass transition also be present to realize the sealing-in of glass and metal, metal in other in the market
Material is generally 4J29 and can cut down, and with that can cut down matched seal, remaining glass expansion coefficient reduces first segment glass successively, by three sections
After transition finally with hard high-boron-silicon glass sealing-in.The method for sealing technique is relatively complicated, and the transitional glass supply of material is rare,
Cost is higher.
The content of the invention
It is an object of the invention to provide a kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method.
To achieve the above object, the technical scheme taken of the present invention is：
A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method, using swollen to 450 DEG C of temperature ranges in room temperature
Kovar alloy and glass tube of the swollen coefficient difference no more than 15%, by the use of the glass dust of the coefficient of expansion therebetween as
Material is crossed, realizes the seal of glass and metal；
The method for sealing concretely comprises the following steps：
(1) kovar alloy is processed into kovar alloy ring with groove, and carries out annealing in hydrogen atmosphere and pre-oxidation treatment；
(2) one or both of terpinol or ethyl cellulose and glass dust are mixed and made into glass dust slurry, use glass
Glass slurry material fills up horizontal positioned kovar alloy ring groove, and is heated to 150-300 DEG C of progress de-waxing；
(3) glass tube is put into horizontal positioned kovar alloy ring groove in vertical shape, ensures that the two contact is close,
Under inert atmosphere protection, 400-650 DEG C is heated the sample to by the way of high-frequency induction heating or in atmosphere furnace, insulation
10-60min。
(4) seal is completed in annealing cooling, and annealing time maintains 20-40min, and annealing temperature maintains 400-500
℃。
Described kovar alloy ring by kovar alloy ring component I 1 and kovar alloy ring component II 2 by laser welding and
Into.
Described glass tube material is 3.3 high-boron-silicon glass.
The volume ratio that one or both of described terpinol or ethyl cellulose mix with glass dust is 2:1-1:1.
Described inert atmosphere is high pure nitrogen or high-purity argon gas.
Sealing structure made of described middle temperature solar vacuum heat-collecting tube glass metal sealing method and stainless steel center
The sealing for the vacuum solar heat-collecting pipe that pipe and bellows are formed is good, and service life is permanent.
A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method provided by the invention, have higher machinery strong
Degree and reliability, temperature in use is up to 400 DEG C.This method uses hard high-boron-silicon glass, remains high-boron-silicon glass in printing opacity
Advantage in the performances such as rate, chemical stability；Devise uniqueness cuts down structure and glass dust filling method；Sealing-in advance can be cut down
Go annealing in hydrogen atmosphere and pre-oxidation treatment, improve the sealing-in quality that can be cut down with glass to greatest extent.
Brief description of the drawings
Fig. 1 is a kind of medium temperature solar vacuum heat-collecting tube sealing structure schematic diagram.Wherein, 1 is kovar alloy ring component I；2
For kovar alloy ring component II；3 be transition material；4 be glass tube；5 be stainless steel mesotube；6 be bellows.
Embodiment
With reference to the accompanying drawings and the present invention will be further described in conjunction with the embodiments.
Embodiment 1：
(1) kovar alloy ring component I is processed into groove cut down with kovar alloy ring component II by laser welding
Alloy hoop, and carry out annealing in hydrogen atmosphere and pre-oxidation treatment；Glass tube material is 3.3 high-boron-silicon glass, external diameter 125mm, and thickness is
3.0mm。
(2) by glass dust and terpinol by volume 2:1 is mixed and made into glass dust slurry, and level is filled up with glass dust slurry
The kovar alloy ring groove of placement, and 240 DEG C of progress de-waxings are heated to, the de-waxing time is 30min；
(3) glass tube is put into horizontal positioned kovar alloy ring groove in vertical shape, ensures that the two contact is close,
Under nitrogen atmosphere protection, 560 DEG C are heated the sample to by the way of high-frequency induction heating, is incubated 15min.
(4) 420 DEG C of insulation 30min annealing, complete seal.
Embodiment 2：
(1) kovar alloy ring component I is processed into groove cut down with kovar alloy ring component II by laser welding
Alloy hoop, and carry out annealing in hydrogen atmosphere and pre-oxidation treatment；Glass tube material is 3.3 high-boron-silicon glass, external diameter 140mm, and thickness is
3.3mm。
(2) by glass dust and ethyl cellulose by volume 3:2 are mixed and made into glass dust slurry, are filled up with glass dust slurry
Horizontal positioned kovar alloy ring groove, and 260 DEG C of progress de-waxings are heated to, the de-waxing time is 30min；
(3) glass tube is put into horizontal positioned kovar alloy ring groove in vertical shape, ensures that the two contact is close,
Under argon gas atmosphere protection, 620 DEG C are heated the sample in atmosphere furnace, is incubated 30min.
(4) 470 DEG C of insulation 30min annealing, complete seal.
Claims (1)
- A kind of 1. middle temperature solar vacuum heat-collecting tube glass metal sealing method, it is characterised in that using in room temperature to 450 DEG C of temperature Kovar alloy and glass tube of the coefficient of expansion difference in section no more than 15% are spent, utilizes the glass of the coefficient of expansion therebetween Powder realizes the seal of glass and metal as transition material；The method for sealing concretely comprises the following steps：(1) kovar alloy is processed into kovar alloy ring component I (1) and kovar alloy ring component II (2), by laser welding into Kovar alloy ring with groove, and carry out annealing in hydrogen atmosphere and pre-oxidation treatment；(2) one or both of terpinol or ethyl cellulose are mixed with the glass dust that percent by volume is 33%-50% Glass dust slurry is made, horizontal positioned kovar alloy ring groove is filled up with glass dust slurry, and is heated to 150-300 DEG C of progress De-waxing；(3) it is 120-150mm by external diameter thickness, thickness is that 3.0-4.0mm 3.3 high-boron-silicon glass pipes are put into level in vertical shape In the kovar alloy ring groove of placement, ensure that the two contact is close；Under the inert atmosphere protection of high pure nitrogen or high-purity argon gas, 400-650 DEG C is heated the sample to using high-frequency induction heating mode or in atmosphere furnace, is incubated 10-60min；(4) seal is completed in annealing cooling, and annealing time maintains 20-40min, and annealing temperature maintains 400-500 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672728.3A CN105254191B (en) | 2015-10-16 | 2015-10-16 | A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672728.3A CN105254191B (en) | 2015-10-16 | 2015-10-16 | A kind of middle temperature solar vacuum heat-collecting tube glass metal sealing method |
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| Publication Number | Publication Date |
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| CN105254191A CN105254191A (en) | 2016-01-20 |
| CN105254191B true CN105254191B (en) | 2017-12-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285648A (en) * | 2017-05-15 | 2017-10-24 | 淮北蓄煌新能源科技有限公司 | A kind of method for welding between nonmetallic materials and metal material |
| CN107540246B (en) * | 2017-10-18 | 2024-02-20 | 镇江市鑫汉太阳能电力有限公司 | Glass with sealing structure and high expansion coefficient |
| CN107628759A (en) * | 2017-10-25 | 2018-01-26 | 上海容东激光科技有限公司 | A kind of burn-back technique of kovar alloy and hard glass |
| CN111039579A (en) * | 2019-12-31 | 2020-04-21 | 沧州天瑞星光热技术有限公司 | Low-temperature annealing process for reducing stress of glass-metal sealing structure |
| CN111555102B (en) * | 2020-05-12 | 2022-11-15 | 南通斯派特激光科技有限公司 | Glass-metal sealing structure laser tube |
| CN113185147A (en) * | 2021-06-19 | 2021-07-30 | 贵州航箭电子产品有限公司 | Stainless steel-glass high-temperature sealing process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS573741A (en) * | 1980-06-11 | 1982-01-09 | Toshiba Corp | Glass soldering method |
| CN201327210Y (en) * | 2008-12-12 | 2009-10-14 | 东莞市康达机电工程有限公司 | Inner corrugated pipe type solar vacuum heat-collecting pipe |
| CN102109231B (en) * | 2009-12-23 | 2013-08-14 | 中金盛唐新能源科技（北京）有限公司 | Line focusing solar vacuum heat-collecting tube |
| CN101786805B (en) * | 2009-12-25 | 2012-03-21 | 北京天瑞星光热技术有限公司 | Sealing method of borosilicate glass and kovar alloy of solar collector tube |
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Effective date of registration: 20190726 Address after: 101407 Beijing city Huairou District Yanqi Economic Development Zone Branch Hing Street No. 11 Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088 Beijing city Xicheng District Xinjiekou Avenue No. 2 Patentee before: General Research Institute for Nonferrous Metals |