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Glass metal bonding sealing process based on force thermoelectric coupling condition

A glass-to-metal, thermoelectric coupling technology, applied in the field of glass-to-metal sealing technology, can solve problems such as unusable, inapplicable, and no successful cases, and achieve low air leakage, high production efficiency, high vacuum and heat collection performance Effect

Inactive Publication Date: 2014-06-04
HAINING MICRO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method cannot be used in the glass-to-metal sealing process with a larger area.
Therefore, this method is not suitable for the sealing of large-diameter glass-metal above Φ37 for solar vacuum heat collectors, and no successful cases have been seen.

Method used

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  • Glass metal bonding sealing process based on force thermoelectric coupling condition
  • Glass metal bonding sealing process based on force thermoelectric coupling condition
  • Glass metal bonding sealing process based on force thermoelectric coupling condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Before sealing: Polish, level, clean and dry the end face of the glass nozzle of the solar vacuum heat collecting tube (conventional technology) to ensure the smoothness of the bonding surface. Polishing, leveling, cleaning and drying (conventional technology) on the metal sheet 4 (round kovar alloy sheet, which can be covered with the glass nozzle of the solar vacuum heat collection tube and whose shape matches) to ensure the integrity of the bonding surface bright and clean.

[0036] Such as figure 1 As shown, the end face of the glass nozzle 6 of the solar vacuum heat collecting tube is clamped and fixed with a clamp 8 (conventional clamp) upwards, and then the middle aluminum solder is stacked. The shape of the end face of the glass nozzle matches, and the thickness is 1-5 μm (this embodiment adopts 2 μm), and finally the Kovar alloy sheet is covered, and it is necessary to ensure that the entire glass surface (that is, the end face of the glass nozzle of the solar...

Embodiment 2

[0039] Before sealing: Polish, level, clean and dry the end face of the glass nozzle of the solar vacuum heat collecting tube (conventional technology) to ensure the smoothness of the bonding surface. Polishing, leveling, cleaning and drying (conventional technology) for the metal sheet (round aluminum sheet, no special requirements for thickness, can be covered with the glass nozzle of the solar vacuum heat collection tube, and the shape matches) to ensure the bonding The smoothness of the face.

[0040] The end face of the glass nozzle of the solar vacuum heat collecting tube is clamped and fixed with the fixture 8 (conventional fixture), and then covered with an aluminum sheet, placed under vacuum conditions, and the entire glass surface (that is, the glass of the solar vacuum heat collecting tube) The end face of the nozzle) and the aluminum sheet are bonded horizontally, the temperature field (realized by electric heating) starts to heat up from room temperature, and the ...

Embodiment 3

[0043] Before sealing: Polish, level, clean and dry the end face of the glass nozzle of the solar vacuum heat collecting tube (conventional technology) to ensure the smoothness of the bonding surface. Polishing, leveling, cleaning and drying (conventional technology) on the metal sheet (round kovar alloy sheet, which can be covered with the glass nozzle of the solar vacuum heat collection tube, and the shape matches) to ensure the smoothness of the bonding surface .

[0044] The end face of the glass nozzle of the solar vacuum heat collecting tube is clamped and fixed with the clamp 8 (conventional clamp), and then covered with a Kovar alloy sheet, and the entire glass surface (that is, the end face of the glass nozzle of the solar vacuum heat collecting tube) ) and the Kovar sheet are bonded horizontally, the temperature field (realized by electric heating) starts to heat up from room temperature, and the heating rate is 0.1-5°C / min. In this embodiment, the heating rate is 3°...

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Abstract

The invention provides a glass metal bonding sealing process based on the force thermoelectric coupling condition. Mechanical pressure sealing and anode bonding are combined and applied to the sealing of metal and glass, double advantages of mechanical pressure sealing and anode bonding are integrated, related processes are simplified, the glass and metal quickly approach under certain impact pressure at relatively low bonding temperature, and the production efficiency and later success rate are improved; meanwhile, with the beneficial effects of anode bonding, the defects of single physical press fit in mechanical pressure sealing are thoroughly overcome, and obvious chemical bond combination is formed between the glass and metal, thereby greatly improving the stability and reliability of the sealing interface and ensuring that a finished glass-metal sealing type evacuated collector tube does not leak air in a long-time medium and high-temperature thermal application process and remarkably high vacuum degree and heat collection property are still maintained; moreover, batch production is easy to realize.

Description

technical field [0001] The invention relates to a glass-to-metal sealing process, in particular to a glass-to-metal bonding and sealing process based on force-thermoelectric coupling conditions. Background technique [0002] The thermal expansion coefficients of glass and metal are very different. The sealing technology of these dissimilar materials is known as the jewel in the crown of the solar thermal industry. At present, the sealing methods mainly include gluing, mechanical sealing, and matching sealing. . [0003] As for the gluing method, it is not suitable for the high temperature condition of the heat collecting tube, so it is basically not considered. The most commonly used method of metallic glass sealing is the method of flame sealing, which fuses the sealed glass and metal together. This method requires that the expansion coefficients between the sealed glass and metal be very matched (the difference is less than 5% ) (the so-called matching seal), and careful...

Claims

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Application Information

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IPC IPC(8): C03C27/00
Inventor 李君朱文豪邵芳芳
Owner HAINING MICRO ENERGY TECH
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