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Ultrasonic-assisted low-temperature glass brazing method

A technology of low-temperature glass and brazing method, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as high viscosity of molten glass, insufficient wetting and spreading, residual pores, etc., achieve good wettability, overcome Insufficient fluidity, the effect of improving strength

Active Publication Date: 2016-04-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient wetting and spreading and residual pores due to the high viscosity of molten glass and narrow weld seam in the existing process of using low temperature glass for brazing, and proposes an ultrasonic Auxiliary Low Temperature Glass Brazing Method

Method used

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  • Ultrasonic-assisted low-temperature glass brazing method

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specific Embodiment approach 1

[0019] Specific implementation mode one: the ultrasonic-assisted low-temperature glass brazing method of this implementation mode is carried out according to the following steps:

[0020] 1. Mix the low-temperature sealing glass powder and the adhesive, put it in a solder paste mixer, and stir at a speed of 100-150r / min for 1-2 hours to obtain a low-temperature glass solder paste;

[0021] 2. Use cutting equipment to cut the raw materials to be welded into shapes to obtain weldments;

[0022] 3. Place the weldment obtained in step 2 in acetone, perform ultrasonic cleaning at room temperature, use water sandpaper to mechanically polish the weldment after ultrasonic cleaning, then place it in acetone for ultrasonic cleaning, and finally transfer it to a drying box drying in medium to obtain dry weldments;

[0023] 4. Use the screen printing method to evenly coat the low-temperature glass solder paste on the pre-connection position on the surface of the dry weldment to obtain th...

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the low-temperature sealing glass solder described in step one consists of 50 parts by mass of P 2 o 5 , 12 parts of SnO, 18 parts of ZnO, 6 parts of B 2 o 3 , 1 copy of A1 2 o 3 , 1 part of SiO 2 and 0.5 parts of Li 2 O composition. Other steps and parameters are the same as those in Embodiment 1.

[0027] In this embodiment, the sealing temperature of the low-temperature sealing glass solder is 480-600°C, and the coefficient of thermal expansion is between 75-125×10 -7 / °C, the viscosity at sealing temperature is 10 3 ~10 5 Pa·s.

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the particle size of the low-temperature sealing glass frit described in step 1 is 25-75 μm. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to an ultrasonic-assisted low-temperature glass brazing method. The ultrasonic-assisted low-temperature glass brazing method aims at solving the problems that in the existing process of brazing through low-temperature glass, as the viscosity of fusion glass under low temperature is large and a welding line is narrow, wetting spreading is not sufficient, and air hole remaining exists. The brazing method includes the steps that (1) low-temperature sealing glass powder and a binding material are mixed to obtain low-temperature glass brazing soldering paste; (2) a to-be-soldered raw material is cut and molded; (3) a soldered piece is subject to ultrasonic washing and polishing; (4) the low-temperature glass brazing soldering paste is coated to pre-connecting positions of the soldered piece; (5) the pre-connecting positions of the soldered piece are attached to form a to-be-soldered piece; and (6) heating is carried out to fuse the low-temperature glass brazing soldering paste, secondary ultrasonic vibration is applied to the surface of the to-be-soldered piece, and furnace cooling is carried out after vibration is stopped. The low-temperature sealing glass used in the method is low in sealing temperature, effective wetting spreading on the surface of the welded piece is carried out under the ultrasonication, obtained brazing connectors are free of macroscopic defects such as cracks and air holes, the residual stress is small, the strength is high, and the gas tightness is good.

Description

technical field [0001] The invention relates to an ultrasonic-assisted low-temperature glass brazing method. Background technique [0002] Low-temperature sealing glass refers to the interlayer glass that seals glass, ceramics, metal and composite materials with each other. Due to its low melting temperature and sealing temperature, good chemical stability and heat resistance and high mechanical strength, it is often used for mutual sealing between glass, ceramics, metals and composite materials. Vacuum and microelectronics technology, laser and infrared technology, high-energy physics, energy, aerospace, automotive, chemical and industrial testing and many other fields have a wide range of applications. [0003] At present, the main problem of using low-temperature sealing glass for brazing is that due to the low brazing temperature, the viscosity of the molten glass solder is relatively high, and the brazing seam is narrow, resulting in the spread of the molten glass sold...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/06B23K1/20C04B37/00C03C8/24
CPCB23K1/008B23K1/06B23K1/20C03C8/24C04B37/005C04B2237/10C04B2237/343C04B2237/36
Inventor 林铁松何鹏于凯凯闫海蓬
Owner HARBIN INST OF TECH
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