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A micro-arc oxidation assisted low temperature glass brazing method

A technology of low-temperature glass and micro-arc oxidation, applied in welding equipment, soldering irons, manufacturing tools, etc., can solve the problems of high viscosity of molten glass solder, poor chemical compatibility of solder, insufficient spreading and wetting, etc., and achieve airtightness Good performance, good protection, cost reduction and effective effect

Active Publication Date: 2018-03-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the insufficient spreading and wetting caused by the poor chemical compatibility between the solder and the base material or the low brazing temperature and the high viscosity of the molten glass solder in the process of using low-temperature glass solder. In order to solve the problem of low strength of brazed joints, a low-temperature glass brazing method assisted by micro-arc oxidation that can improve the corrosion resistance of the base metal is proposed

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0021] Specific implementation mode 1: The low-temperature glass brazing method assisted by micro-arc oxidation in this implementation mode is carried out according to the following steps:

[0022] 1. Mix the low-temperature sealing glass powder with the adhesive and place it in a solder paste mixer, and stir at a speed of 100-130r / min for 1-2 hours to obtain a low-temperature glass solder paste;

[0023] 2. Use cutting equipment to cut the base metal to be welded into shape to obtain weldments;

[0024] 3. Use water sandpaper to mechanically polish the weldment obtained in step 2, then place it in pickling solution for pickling, and finally place the weldment after pickling in acetone, and ultrasonically clean it at room temperature to obtain the pretreated weldment. pieces;

[0025] 4. Connect the pretreated weldment to the anode of the DC power supply, connect the stainless steel plate to the cathode of the DC power supply, and immerse it in the alkaline electrolyte at the...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is that when the low-temperature sealing glass powder described in step one is composed of 60 parts of PbO, 25 parts of ZnO, 6 parts of B 2 o 3 , 0.3 copies of A1 2 o 3 , 0.2 parts of SiO 2 and 0.3 part of Li 2 O composition. Other steps and parameters are the same as those in Embodiment 1.

[0030] In this embodiment, the low-temperature sealing glass frit is PbO-ZnO-B 2 o 3 system, the sealing temperature is between 420-480°C, and the coefficient of thermal expansion is 75-90×10 -7 / °C, the viscosity at sealing temperature is 10 2 ~10 5 Pa·s

specific Embodiment approach 3

[0031] 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 25-80 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 a low-temperature glass brazing method aided by micro-arc oxidation. The invention aims at solving the problems that the spreadability and the wettability are insufficient and the strength of a brazed joint is relatively low due to poor chemical compatibility or low brazing temperature between a brazing material and masterbatch and high viscosity of a molten glass brazing material in a process of brazing using the low-temperature glass brazing material. The brazing method comprises the following steps: 1, mixing low-temperature sealing glass powder and an adhesive to obtain brazing paste; 2, carrying out cutting molding on masterbatch to be brazed; 3, carrying out ultrasonic cleaning and polishing on a weldment; 4, carrying out micro-arc oxidation and hole sealing on the weldment; 5, coating the surface of the weldment subjected to micro-arc oxidation with the brazing paste; 6, constituting a piece to be brazed; 7, carrying out high-pressure brazing in an argon atmosphere or under a negative pressure condition. The low-temperature sealing glass used in the brazing process is low in sealing temperature and small in linear expansion coefficient; the obtained brazed joint has no cracks and pores, and has small residual stress, high strength and good air tightness; meanwhile, a compact ceramic film layer formed by micro-arc oxidation has a favorable protection effect on the masterbatch.

Description

technical field [0001] The invention relates to a method for brazing low-temperature glass assisted by micro-arc oxidation. 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] Micro-arc oxidation technology is a combination of electrolyte and corresponding electrical parameters, relying on the instantaneous high temperature and high pressure generated by arc discharge on the surface of metals and their alloys to grow a cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K3/03
CPCB23K1/008B23K1/19B23K1/203B23K1/206B23K3/0384
Inventor 林铁松何鹏于凯凯闫海蓬
Owner HARBIN INST OF TECH
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