Preparation method of water-in-oil type BNi5 solder paste

Abstract

The invention discloses a preparation method of water-in-oil type BNi5 solder paste. The preparation method comprises the following steps of (1) mixing fatty alcohol-polyoxyethy with stearic acid and stearoyl-rac-glycerol according to measured quantity to obtain a mixture A, melting the mixture A under 60-70 DEG C, stirring the melted mixture under 60-70 DEG C for 1 hour, and discharging the stirred mixture when being hot to obtain sheet-like emulsifier materials; and (2) weighing and adding an appropriate quantity of the sheet-like emulsifier materials into mechanical oil to obtain a mixture B, melting the mixture B under 60-70 DEG C, stirring the melted mixture, and uniformly heating the stirred mixture; then adding water and polyethylene glycol 6000 to obtain a mixture C, stirring the mixture C under room temperature for 2 hours to fully emulsify the mixture C; and finally, adding BNi5 solder powder to obtain a mixture D, and stirring the mixture D for 2 hours to obtain the water-in-oil type BNi5 solder paste. The lubrication level of the water-in-oil type BNi5 solder paste and metal surfaces is improved, so that through air purging, excessive solder is blown off from porous channels, and required solder can be aggregated at a to-be-brazed point; through air purging, excessive solder paste on the surfaces can be completely blown off, and the solder paste can be repeatedly used; and production technology is simplified, production efficiency is improved, solder paste is saved, and product quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of BNi5 solder paste preparation, in particular to a preparation method of water-in-oil type BNi5 solder paste capable of improving the lubricity with metal surfaces. Background technique [0002] BNi5 solder is an indispensable material for high temperature resistant metal products, especially the special solder paste for high temperature vacuum brazing, which is characterized by high welding strength and good high temperature resistance, and is an indispensable material for the production of metal honeycomb carriers. The production of the metal carrier is to superimpose and wind the corrugated foil belt and the flat belt, and then apply solder paste and braze at high temperature. The brazing point of the carrier is a metal indirect contact, which is a linear contact and is on the three tops of the channel (triangle), so the solder must be applied to the brazing point to be effective, otherwise it will not ...

AI Technical Summary

Problems solved by technology

Currently commercially available BNi5 solder paste has poor fluidity, and water washing and rolling coating methods are often used. The washing method must recover the solder paste washed off by water, and then mix it after centrifugal separation, drying, and testing. The process is cumbersome and wastes a lot

The method of roller coating is to adhere a layer of solder paste on the metal surface, and then process it after drying. First, the equipment investment is large, and second, part of the solder paste coating will fall off during post-processing, which will affect product quality. Third, the solder paste big waste