Method for laser sealing glass and kovar alloy

An alloy and glass technology, applied in the field of connection of dissimilar materials, can solve the problems of low production efficiency, difficult preparation, human health hazards, etc., and achieve a good flexible manufacturing environment, narrow processing heat affected zone, and improve service life. Effect

Inactive Publication Date: 2013-07-24
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation process of the above method is relatively complicated, and its production efficiency is relatively low
In addition, the above-mentioned methods can generally only produce small-sized seals, and it is difficult to obtain large-scale seals with small thermal stress seals. In some fields, such as the construction industry, large-scale glass and Kovar alloys are required Sealing parts, the above method is difficult to prepare
At present, the above-mentioned large-size glass and Kovar alloy seals used in the construction industry are mainly sealed with glass putty. However, the glass putty in this connection method is a chemical substance that is harmful to human health and does not conform to the national green development. the trend of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A laser sealing method for glass and Kovar alloy, comprising the steps of:

[0026] First, the window glass sample and Kovar alloy are pretreated (cleaning, degreasing and pre-oxidation treatment),

[0027] Place the window glass sample (8×20×4mm (length×width×thick)) on the Kovar alloy steel plate (10×25×1.5mm (length×width×thick)), and clamp the two with a clamp (guarantee The two are in full contact, no gap visible to the naked eye), and the laser beam is scanned at a distance of 1~3mm from the edge of the sample. During the scanning process, the laser head does not move, and the worktable moves linearly along the X or Y direction to complete the sealing process;

[0028] The position of the scanning line is 1~2mm away from the edge of the window glass sample, the focus of the laser beam is located at the interface between the window glass and the Kovar alloy steel plate, the length of the scanning line is 78mm (X direction) and 18mm (Y direction), the current is 120...

Embodiment 2

[0032] A laser sealing method for glass and Kovar alloy, comprising the steps of:

[0033] First, the window glass sample and Kovar alloy are pretreated (cleaning, degreasing and pre-oxidation treatment), and the window glass sample (8×20×4mm (length×width×thickness)) is placed on the Kovar alloy steel plate (10×25 ×1.5mm (length×width×thickness)), and clamp the two with a clamp;

[0034] Nd:YAG laser sealing is carried out on the window glass and Kovar alloy. The scanning line is 1~2mm away from the edge of the window glass sample. The focus of the laser beam is located at the interface between the window glass and the Kovar alloy steel plate. direction) and 16mm (Y direction), the current is 130A, the pulse width is 2.5ms, the frequency is 10Hz, and the scan rate is 100mm / min;

[0035] After the sealing is completed, the samples and fixtures are quickly moved to a 200°C box-type resistance furnace for stress relief treatment. The cooling method is to cool with the furnace, ...

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Abstract

The invention discloses a method for laser sealing glass and kovar alloy. The method includes that (a) clean treatment is carried out on the glass, and derosination treatment and deoiling treatment are carried out on the kovar alloy; (b), the glass is placed on the kovar alloy and is contacted with the kovar alloy tightly; (c) straight-line radiation is carried out with a laser device, the focus of a laser beam is positioned in the junction of the glass and the kovar alloy to obtain a sealing body; and (d) the sealing body is moved to a heating furnace of 100-300 DEG C, stress relief annealing is carried out, and after cooled to room temperature along with the furnace, the sealing body of the glass and the kovar alloy can be obtained. According to the method, due to the fact that technological parameters are optimized, a heat action area and temperature distribution in the area are accurately controlled, and the pulse width, frequency, scanning speed and the temperature of the stress relief annealing are controlled, so that the low-stress and large-size sealing body of the glass and the kovar alloy is obtained, the sealing body can be applied to the construction industry, and the service life of a product is improved substantially.

Description

technical field [0001] The invention relates to a laser sealing method for glass and Kovar alloy, which belongs to the technical field of connection of heterogeneous materials. Background technique [0002] Kovar alloy, English is KOVAR, also known as iron-nickel-cobalt alloy. The alloy has a linear expansion coefficient similar to that of hard glass in the range of 20~450 °C and the corresponding hard glass can be effectively sealed and matched, and has a high Curie point and good low-temperature structural stability. The oxide film of the alloy is dense. , easy to weld and weld, has good plasticity, can be cut and processed, and is widely used in the production of electric vacuum components, emission tubes, picture tubes, switching tubes, transistors, sealing plugs and relay casings, etc. [0003] At present, the connection methods of glass and Kovar alloy mainly include flame fusion sealing method and anodic diffusion bonding method. For example: Chinese invention paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/32C03C27/02B23K26/324
Inventor 陈长军包亦望王晓南张敏万德田
Owner SUZHOU UNIV
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