Low-temperature glass brazing method aided by micro-arc oxidation

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...