Vacuum diffusion welding process for glass and metal

A welding process and metal welding technology, applied in the field of glass and metal vacuum diffusion welding process, can solve the problems such as failure to solve the damage and failure of glass and metal sealing joints, complicated operation steps, etc., and achieve improved air tightness, simple process flow, The effect of improving the service life

Active Publication Date: 2009-05-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of the above prior art not only complicates the process steps, but also cannot solve the phenomenon of damage and failure of glass and metal sealing joints

Method used

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  • Vacuum diffusion welding process for glass and metal
  • Vacuum diffusion welding process for glass and metal
  • Vacuum diffusion welding process for glass and metal

Examples

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Effect test

Embodiment 1

[0026] A glass and metal vacuum diffusion welding process, the metal is an alloy mainly containing iron, cobalt, nickel, the process comprises the following steps:

[0027] 1) Surface treatment of glass and metal welded parts:

[0028] i. Put the metal welded parts in ethanol solution and use ultrasonic cleaning, then use 800# sandpaper and metallographic sandpaper to smooth the end face of the metal welded part and then polish it to get a smooth end face, then clean it with acetone, ethanol and water respectively Surface; the glass welded parts are cleaned with acetone, ethanol, and water respectively, and finally the metal and glass welded parts are dried in a drying oven.

[0029] ii. Put the metal weldment at 1000℃, and N 2 +H 2 O+H 2 Insulated in the atmosphere for 25min, oxidized to obtain Fe 3 o 4 Oxide film as the main component.

[0030] 2) Install the processed weldment in a high-vacuum solid-state pressure diffusion welding furnace, vacuumize, and perform vacu...

Embodiment 2

[0037] The difference between this embodiment and embodiment 1 is that the i step in step 2) is:

[0038] The metal 1 and the glass 2 are pipe fittings, the welding surfaces of the metal 1 and the glass 2 are in contact, a pair of high-temperature-resistant symmetrical semicircular fixtures 3 are added to the upper and lower end surfaces, and a symmetrical semicircular expanded graphite 4 is arranged inside the fixture 3, and the Both sides of the fixture 3 are fixed with bolts, and expanded graphite 4 is added in the metal tube 1 in order to generate sufficient pressure. The glass 2 and metal 1 diffusion welding installation and fixing methods are as follows figure 2 and 3 shown.

[0039] The invention can be widely used in solar thermal power generation, and will greatly improve the efficiency of solar parabolic trough solar thermal power generation, thereby alleviating the energy crisis and reducing the greenhouse effect.

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Abstract

The invention relates to a glass and metal vacuum diffusion welding technology, which comprises the following steps: 1) glass and metal weldments are subjected to surface treatment; and 2) the treated weldments are arranged in a high vacuum solid-state pressure diffusion welding furnace, and the vacuum is pumped for vacuum diffusion welding, wherein the step 1) comprises: step 1.1) the metal weldment is subjected to cleaning and surface finish treatment, and the surface of the glass weldment is cleaned; and step 1.2) the surface of the metal weldment is subjected to pre-oxidization treatment. The technology has the advantages that the technology improves the tensile strength, service life and vacuum tightness of glass and metal sealing joints, and has low cost and good economic effect.

Description

technical field [0001] The invention relates to a process manufacturing method for sealing glass and metal by using vacuum diffusion welding technology, and the process method can be used in solar thermal power generation technology. Background technique [0002] Vacuum diffusion welding is a solid-state welding method in which two dissimilar materials are placed in a vacuum chamber, heated to below the melting point of the welding material under a certain vacuum range and under a certain pressure, so that atoms diffuse each other to achieve welding. The existing metal and non-metallic vacuum pressure diffusion welding process includes the following process steps: (1) the welded part is subjected to surface treatment, and when the thickness of the metal welded part is greater than 2 mm, a circle is formed near the outer side of the diffusion welding surface. stress groove; then install the processed weldment in a high-vacuum solid-state pressure diffusion welding furnace and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C27/02
Inventor 凌祥申希海董为勇
Owner NANJING UNIV OF TECH
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