Silver-based solder paste and preparation method thereof

Abstract

The invention discloses silver-based solder paste and a preparation method thereof. The silver-based solder paste comprises the components of, by mass, 75%-80% of Ag-Cu-Zn alloy brazing filler metal powder, 10%-14% of fluoride silver brazing flux powder, 7%-8% of a saturated sodium silicate aqueous solution, 2%-3% of white oil and 1%-2% of alkylphenol polyoxyethylene. The preparation method comprises the steps that (1) an Ag-based brazing filler metal ingot is made into powder of about 200 meshes, 75%-80% of the filler metal powder and 10%-14% of the fluoride silver brazing flux powder are selected by mass and stirred to be evenly mixed by utilization of a glass rod; (2) sodium silicate powder with the modulus being 1.8-2.0 is dissolved into distilled water at the temperature of around 80 DEG C, the saturated sodium silicate solution is prepared, and 7%-8% of the saturated sodium silicate solution is weighed; (3) 2%-3% of the white oil is sufficiently dissolved into 1%-2% of the alkylphenol polyoxyethylene, and an organic solution is obtained after evenly mixing the white oil and the alkylphenol polyoxyethylene; and (4) a brazing filler metal and fluoride silver brazing flux powder mixture and the saturated sodium silicate solution are evenly mixed, and the organic solution is added into a mixture and mixed evenly again to obtain the solder paste.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a paste solder used for induction brazing of diamond drill bits. Background technique [0002] At present, factories mainly use flame brazing to manufacture diamond bits, which not only has low efficiency and is easy to pollute the environment, but also the quality of products produced by flame brazing is unstable, and it is easy to cause burning of the diamond layer. Its quality depends entirely on The technical level of workers. The invention provides a brazing paste which can be used for high-frequency induction brazing. The brazing paste has the characteristics of short working time interval, little environmental pollution, simple and convenient preparation method and low cost. The brazing paste is pre-coated on the welding position before welding. Since the brazing paste contains a binder, it can be solidified at the initial position during heating without auxiliary posit...

AI Technical Summary

Problems solved by technology

[0002] At present, factories mainly use flame brazing to manufacture diamond bits, which not only has low efficiency and is easy to pollute the environment, but also the quality of products produced by flame brazing is unstable, and it is easy to cause burning of the diamond layer. Its quality depends entirely on worker's technical level

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