Alloy composite brazing filler metal for improving welding wettability

Abstract

The invention discloses alloy composite brazing filler metal for improving welding wettability. The alloy composite brazing filler metal comprises the following substances, by weight, 65-78 parts of aluminum-based quasicrystal alloy powder, 17-32 parts of petroleum calcium sulfonate, 15-20 parts of triethanolamine, 20-35 parts of water glass, 19-28 parts of brass powder, 3-6 parts of sodium lauryl sulfate, 9-16 parts of polymethyl methacrylate, 11-16 parts of silicon dioxide, 40-62 parts of styrene-acrylonitrile copolymer, 5.5-8 parts of barium stearate and 10-20 parts of alkylbenzene. The alloy composite brazing filler metal enables a brazing layer to be more uniform and more reasonable in structure, so that the wettability of solder is improved, the thermal-fatigue resistance of a brazing joint is enhanced, the airtightness of the brazing joint and the strength of a brazing joint are improved, the cost of atmosphere welding is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to an alloy composite brazing material which increases welding wettability. Background technique [0002] In the prior art, for the connection between glass and glass, ceramics and ceramics, between glass or ceramics and metal, a low-temperature brazing welding method is usually used, and the brazing solder used is gold (Au) tin (Sn) Alloy solder, because gold-tin solder has the characteristics of high strength, good oxidation resistance, excellent thermal fatigue and creep resistance, low melting point, and good fluidity. However, since Au is an element of group IB, and Sn is an element of group IVA, the diffusion mechanism of Au and Sn is an interstitial mechanism, and the diffusion speed is very fast. The phase diagram of gold-tin binary alloy is very complicated, and there are many intermediate phases, and these intermediate phases are all It is a hard and brittle phase, so it often affects the quality of brazed joints, for e...

AI Technical Summary

Problems solved by technology

However, since Au is an element of group IB, and Sn is an element of group IVA, the diffusion mechanism of Au and Sn is an interstitial mechanism, and the diffusion speed is very fast. The phase diagram of gold-tin binary alloy is very complicated, and there are many intermediate phases, and these intermediate phases are all It is a hard and brittle phase, so it often affects the quality of brazing joints, for example, the strength is poor, the airtight performance cannot meet the requirements, etc., especially in the use of optoelectronic packaging, it cannot meet the use requirements