A kind of borosilicate glass, glass-metal matching sealing piece and its preparation method and application

A glass and metal technology, applied in the field of glass and high temperature vacuum solar collectors, can solve the problems of poor wettability, poor cold and thermal shock resistance, poor light transmittance and weather resistance of molybdenum group glass, and achieve strong weather resistance. , The effect of stable quality and reducing technical difficulty

Inactive Publication Date: 2014-10-15
SHANDONG LINUO NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early research, in order to reduce the difficulty of sealing, molybdenum group glass and Kovar alloy were used for matching sealing, but the light transmittance and weather resistance of molybdenum group glass are poor, and it is difficult to meet the long-term outdoor work requirements of high temperature vacuum solar collector tubes
Historically, no other matched metal and glass has had a large number of industrial applications
In addition, there is also a lot of research on non-matching sealing technology. SOLEL uses borosilicate 3.3 glass and stainless steel metal ring with wedges for non-matching sealing. Since the average linear expansion coefficient of borosilicate 3.3 glass (3.3 ± 0.1) × 10 -6K-1 (20℃~300℃) and stainless steel expansion coefficient (6~16×10-6 / ℃) differ too much Large, extremely high requirements on the mechanical processing of metal sealing parts and glass-metal sealing technology, and the sealing parts are poor in air tightness and poor in cold and heat shock resistance
Patent 200820124787.2 also discloses a glass-metal hermetic joint, which is welded by non-matching welding technology. Although it can be used at high temperature, the expansion coefficient difference between glass and metal is relatively large, and the wettability is not good. The metal alloy needs to be treated, and the weather resistance and light transmittance of the glass used are difficult to further improve

Method used

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  • A kind of borosilicate glass, glass-metal matching sealing piece and its preparation method and application

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Embodiment 1

[0028] The borosilicate glass of the present invention has good performance, and its coefficient of expansion is close to Kovar alloy, and can be matched and sealed with Kovar alloy, and its composition is: B 2 o 3 10.0wt%, Al 2 o 3 6.5 wt%, Na 2 O 6.5 wt%, K 2 O 1.5 wt%, CaO 0.5 wt%, Li 2 O 0.5wt%, SiO 2 In addition, in addition to the above-mentioned components, iron impurities are inevitably mixed in the glass, and the iron content is controlled to be ≤150ppm during preparation. According to the composition of the above glass components, select quartz sand, aluminum hydroxide, anhydrous borax, boric acid, soda ash, potassium carbonate, lithium carbonate, calcite, fluorite, and table salt as raw materials to prepare glass. When selecting raw materials, the dosage requirements of each raw material It is determined according to the content in the glass composition, and the iron content of each mineral raw material is ≤50ppm.

[0029] According to the use of the glass...

Embodiment 2

[0032] The glass tube prepared above can be matched and sealed with Kovar alloy to obtain a glass-metal matching seal, such as figure 1 shown. The specific steps are: stamping and turning 4J29 Kovar alloy to obtain a Kovar alloy ring, the outer diameter of the alloy ring is 125mm, the inner diameter is 118mm, the length of one end flanging is 3.5mm, the length is 25mm, and the wall thickness is 0.8mm. Clean the Kovar alloy ring, and after cleaning, treat it in wet hydrogen at 1000°C for 30 minutes, and then use a high-temperature flame to carry out matching sealing between the borosilicate glass tube and the Kovar alloy. The glass tubes are sealed with a sealing length of 5 mm, and annealed at 560° C. for 1 hour after sealing to eliminate the glass-metal sealing stress and obtain a glass-metal matching sealing piece. The obtained sealing piece can be used to cover glass tubes with trough-type high-temperature vacuum solar heat collection tubes, has strong weather resistance, ...

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Abstract

The invention discloses a borosilicate glass, which is characterized in that it comprises the following components in weight percentage: B2O3 10.0%, Al2O3 6.5%, Na2O 6.5%, K2O 1.5%, CaO 0.5%, Li2O 0.5%, The rest is SiO2. The invention also discloses a glass-metal matching sealing piece obtained by matching and welding the glass and Kovar alloy, and a preparation method and application of the sealing piece. The glass of the present invention has strong weather resistance, strong mechanical impact resistance, high solar transmittance, and the average linear expansion coefficient is very close to that of Kovar alloy. The sealing technology is difficult, the preparation process conditions are mild, and it is easy to implement. The obtained glass-metal matching seal has strong weather resistance and can work stably for a long time in the range of room temperature to 300 °C, which meets the requirements of the field of high-temperature vacuum solar collector tubes.

Description

technical field [0001] The present invention relates to a new borosilicate glass and the glass-metal matching sealing part obtained by sealing the glass and metal, and also relates to the preparation method of the sealing part and its application in high-temperature vacuum solar heat collecting tubes, belonging to glass and metal High-temperature vacuum solar collector tube technology field. Background technique [0002] The trough solar thermal power generation system is the breakthrough and focus of promoting the commercial application of the solar thermal power generation system in the world in the near future. The United States once organized a large number of experienced experts to form a working group to evaluate the trough solar thermal power generation system. The result is The trough solar thermal power generation system has low power generation cost and has good technical development potential and market potential. The core component of the trough solar thermal po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/091C03C27/00F24J2/48
CPCY02E10/40
Inventor 刘希杰郑树祥禚明裴志杰杨波
Owner SHANDONG LINUO NEW MATERIAL
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