Glass and metal vacuum brazing technique

A brazing process and a technology for metal workpieces, applied in the field of glass and metal vacuum brazing process, can solve the problem of difficulty in meeting the quality requirements of glass and metal sealing joints in solar collectors, low quality of welded joints, limited connection methods, etc. problems, to achieve the effect of low cost, few welding steps, and easy mass production

Active Publication Date: 2011-08-17
NANJING UNIV OF TECH
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Problems solved by technology

The sealing of glass and metal is the connection between dissimilar materials. Due to the great difference in the physical properties of their materials, there are many difficulties in their connection, and the connection methods are also very limited.
At present, the commonly used sealing methods mainly include high-temperature fusion sealing and field diffusion connection, and vacuum brazing is used to seal very few, and the quality of welded joints obtained by fusion sealing and field diffusion connection is not high, and it is difficult to meet the requirements of solar energy. Quality requirements for glass and metal sealing joints in collectors

Method used

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  • Glass and metal vacuum brazing technique
  • Glass and metal vacuum brazing technique
  • Glass and metal vacuum brazing technique

Examples

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Embodiment 1

[0024] A glass and metal vacuum brazing process, the process includes the following steps:

[0025] 1) Treat glass and metal surfaces:

[0026] i. Sand blast the glass surface, then clean the surface with acetone, ethanol and water; put the metal workpiece in a hydrogen burning furnace for "hydrogen burning" purification treatment, and then polish the end surface with 1000# sandpaper and metallographic paper , After obtaining a smooth end face with a certain roughness, clean it with acetone, ethanol and water respectively. Finally, the glass and metal workpieces are dried in a drying oven for later use.

[0027] ii. Coating a uniform layer of copper on the surface of the glass workpiece.

[0028] 2) Assemble the processed welded workpieces, then place them in a vacuum brazing furnace, evacuate and heat for vacuum brazing:

[0029] i. The solder 5 is preset in the welding interface between the glass 4 and the metal 6, taking into account the influence of the expansion and de...

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Abstract

The invention relates to a glass and metal vacuum brazing technique which has the advantages of simple operation, low cost and good economic effect. The technique has the technical scheme of comprising the steps of: 1) carrying out surface treatment on glass and metal workpieces; and 2) putting the treated welding workpieces into a vacuum brazing furnace, and vacuumizing and heating for vacuum brazing. The technique is characterized in that the step 1) comprises: carrying out roughening and cleaning treatment on the surface of glass; carrying out surface purification and smooth finish treatment on the metal workpieces; and carrying out chemical plating treatment on the surface of glass.

Description

technical field [0001] The invention relates to a manufacturing method for sealing glass and metal by vacuum brazing technology, and the method can be applied to the fields related to the connection of glass and metal. Background technique [0002] The sealing technology of glass and metal has been widely used in the manufacture of various high-quality electric light sources, electron tubes and other electric vacuum devices. In recent years, it has been applied to solar thermal power generation technology and has become the key technology of solar collector tubes. For the glass and metal sealing joints in solar collector tubes, it is necessary not only to ensure a certain degree of vacuum in the collector tubes, but also to withstand large tensile stresses and alternating loads due to the large temperature difference between day and night. high quality requirements. The sealing of glass and metal is the connection between dissimilar materials. Due to the great difference in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C27/00
Inventor 凌祥钟正军谭明明
Owner NANJING UNIV OF TECH
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