Anodizing-assisted low-temperature glass brazing method

A low-temperature glass and anodizing technology, applied in anodizing, welding equipment, manufacturing tools, etc., can solve the problems of high viscosity of molten glass solder, poor chemical compatibility of solder, and cumbersome solder paste configuration process, so as to reduce costs. and the complexity of the brazing process, good protection, and the effect of improving joint strength and air tightness

Active Publication Date: 2016-04-06
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. Due to the problems of low strength of brazed joints, cumbersome solder paste configuration process, and poor control of dosage, an anodic oxidation-assisted low-temperature glass brazing method that can improve the corrosion resistance of the base metal is proposed

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0019] Specific Embodiment 1: The low-temperature glass brazing method assisted by anodic oxidation in this embodiment is carried out according to the following steps:

[0020] 1. Put the low-temperature sealing glass powder into the graphite mold, place it in a resistance furnace, and heat it to 600-700°C at a heating rate of 10-15°C / min under nitrogen protection, keep it warm for 30-60min and then cool it with the furnace. Then keep it warm for 30-40 minutes at a temperature of 400-500°C, and cool to room temperature to obtain a low-temperature sealed glass block;

[0021] 2. Cut the low-temperature sealing glass block obtained in step 1 into thin slices by using an inner circle cutting machine to obtain sheet-like low-temperature glass solder, and then use cutting equipment to cut the base material to be welded into shape to obtain weldments;

[0022] 3. Use water sandpaper to mechanically grind the weldment obtained in step 2, then place the polished weldment in pickling s...

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the low-temperature sealing glass frit described in step one consists of 65 parts by mass of B 2 o 3 , 20 copies of P 2 o 5 , 12 parts of ZnO, 0.3 parts 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.

[0027] In this embodiment, the low-temperature sealing glass powder is lead-free sealing glass powder, the sealing temperature is between 460-530°C, and the linear expansion coefficient is 80-150×10 -7 / °C, the viscosity when sealing is less than 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 30-80 μm. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses an anodizing-assisted low-temperature glass brazing method which aims at mainly solving the problem that in the process of using low-temperature glass brazing for brazing, spreading wetting is insufficient due to poor chemical compatibility of the brazing and base metal or low brazing temperatures and large fused glass brazing viscosity. The brazing method comprises the steps that firstly, low-temperature sealing ground glass is put into a mold to be smelted into a block, and a low-temperature glass block is obtained; secondly, the low-temperature sealing glass block is cut into slices, and base metal to be brazed is cut and molded; thirdly, a brazing piece is subjected to ultrasonic cleaning and grinding; fourthly, the brazing piece is subjected to anodizing and hole sealing treatment; fifthly, the slice-shaped low-temperature glass brazing is put at the to-be-connected position of the brazing piece; and sixthly, heating is conducted for melting brazing paste, heat preservation is carried out, and then the brazing piece is cooled along with a furnace. The slice-shaped low-temperature glass used in the method is low in sealing temperature and small in coefficient of linear expansion, an obtained brazing connector is free of macroscopic defects such as cracks and air holes and high in strength, and meanwhile an oxidation film formed through anodizing has a good protection effect on the base metal.

Description

technical field [0001] The invention relates to a method for anodic oxidation-assisted low-temperature glass brazing. 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] Anodizing is the electrochemical oxidation of a metal or alloy. Under the corresponding electrolyte and specific process conditions, metals and their alloys form an oxide film on the surface due to the action of external current. The metal oxide film cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20C25D11/02C03C12/00
CPCB23K1/008B23K1/206C03C12/00C25D11/02
Inventor 林铁松何鹏于凯凯闫海蓬
Owner HARBIN INST OF TECH
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