In-situ synthesized metal coating silver brazing rod and preparation method thereof

A technology of metal cladding and in-situ synthesis, applied in metal processing equipment, welding equipment, welding media, etc., can solve the problems of easy oxidation, difficulty in making rings, corrosion of solder cores, etc., and achieve high coating activity, Effect of improving wettability and fluidity

A technology of metal cladding and in-situ synthesis, applied in metal processing equipment, welding equipment, welding media, etc., can solve the problems of easy oxidation, difficulty in making rings, corrosion of solder cores, etc., and achieve high coating activity, Effect of improving wettability and fluidity

CN108406162AActive Publication Date: 2018-08-17ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • In-situ synthesized metal coating silver brazing rod and preparation method thereof
  • In-situ synthesized metal coating silver brazing rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method for in-situ synthesis of metal-clad coating silver brazing rod, comprising the following steps:

[0028] a) Take Ag 34%, Cu 35.8%, Zn 27%, Sn 1.5%, P 0.4%, Ni 1%, Si0.15% and Li 0.15% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace , obtaining strip-shaped silver solder cores by smelting, casting, extruding and drawing;

[0029] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, add metal cleaning agent, and degrease and clean the surface of the strip-shaped silver solder core;

[0030] c) Prepare a pickling solution with sulfuric acid and water at a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak for 10 minutes at a temperature of 60°C;

[0031] d) Rinse the strip-shaped silver solder cores after pickling, then passivate them in a passivating agent, and then put the s...

Embodiment 2

[0035] A preparation method for in-situ synthesis of metal-clad coating silver brazing rod, comprising the following steps:

[0036] a) Take Ag 50%, Cu 32%, Zn 14%, Sn 1.75%, P 0.5%, Ni 1.5%, Si0.1% and Li 0.15% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace , obtaining strip-shaped silver solder cores by smelting, casting, extruding and drawing;

[0037] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, add metal cleaning agent, and degrease and clean the surface of the strip-shaped silver solder core;

[0038] c) Prepare a pickling solution with sulfuric acid and water at a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak for 20 minutes at a temperature of 40°C;

[0039] d) Rinse the strip-shaped silver solder core after pickling, then passivate it in a passivating agent, and then put the stri...

Embodiment 3

[0043] A preparation method for in-situ synthesis of metal-clad coating silver brazing rod, comprising the following steps:

[0044] a) Take Ag 40%, Cu 30%, Zn 25%, Sn 2.5%, P 0.5%, Ni 1.6%, Si 0.2% and Li 0.2% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace, Obtaining strip-shaped silver solder cores by smelting, casting, extruding and drawing;

[0045] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, add metal cleaning agent, and degrease and clean the surface of the strip-shaped silver solder core;

[0046] c) Prepare a pickling solution with sulfuric acid and water at a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak for 15 minutes at a temperature of 70°C;

[0047] d) Rinse the strip-shaped silver solder core after pickling, then passivate it in a passivating agent, and then put the strip-...

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Abstract

The invention relates to an in-situ synthesized metal coating silver brazing rod and a preparation method thereof. The in-situ synthesized metal coating silver brazing rod is composed of a strip-shaped silver brazing filler metal core and a coating coated on the outer part of the silver brazing filler metal core, wherein the silver brazing filler metal core consists of the following components inpercentage by weight: 10-50% of Ag, 15-45% of Cu, 17-40% of Zn, 1-3% of Sn, 0.1-0.5% of P, 0.5-2% of Ni, 0.1-0.3% of Si and 0.1-0.3% of Li; and the coating consists of the following components in percentage by weight: 5-10% of elemental boron micro powder, 5-10% of sodium borohydride, 15-30% of potassium fluoborate, 25-40% of boric anhydride, 10-30% of sodium fluoride, 2-4% of potassium bifluoride, 1-5% of copper sulfate, 0.1-2% of polystyrene and 0.2-2% of dibutyl phthalate. The brazing filler metal core of the coating sliver brazing rod is good in wettability, is good in liquidity, has self-brazing effect, and enables zinc to be not liable to volatilize; and moreover, the coating has the advantages of being high in activity, weak in moisture absorption, less in carbon residues, good in plasticity and toughness, and the like, and is especially suitable for assemblies such as brazing stainless steel and manganese brass.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to an in-situ synthesized metal-coated silver brazing rod and a preparation method thereof. Background technique [0002] The traditional brazing process of the pipeline is the manual flame brazing of wire or strip solder. The flame brazing temperature is high and the heating is fast, but it is prone to problems such as uneven heating and overburning, and the heat conduction of brazing copper is fast. The heating time is longer for metals. When brazing, wire or strip-shaped solder is used to apply the flux to the workpiece before heating or pre-heating. The amount of solder can not be guaranteed, and problems such as solder leakage and solder blockage are prone to occur, followed by Rework, rework or even scrapping will cause waste of solder and raw materials and increase manufacturing costs. In addition, the operation of solder paste or pre-coated flux increases the pre...

Claims

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Application Information

Patent Timeline
17 Aug 2018
Publication
CN108406162A
IPC
B23K35/30; B23K35/40; B23K35/365
CPC
B23K35/0227; B23K35/3006; B23K35/302; B23K35/3602; B23K35/3606; B23K35/365; B23K35/404
Inventors
裴夤崟; 钟素娟