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A kind of copper-phosphorus brazing filler metal and preparation method thereof

A technology of copper-phosphorus brazing material and soldering sheet, which is applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of high surface finish of soldering sheet, limited self-brazing performance, poor wettability of soldering sheet, etc., and shorten the production process , improve the production efficiency of brazing, and the effect of uniform flux distribution

Active Publication Date: 2022-02-15
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the existing copper-phosphorus solder has limited self-brazing performance, and the wettability of the solder sheet is poor when used for welding brass parts, and it is usually necessary to apply additional flux on the surface of the solder sheet; however, due to the rolling process The surface finish of the obtained copper-phosphorus solder solder sheet is very high, and the flux is difficult to be evenly coated on the surface of the solder sheet, which affects the welding effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing a copper-phosphorus brazing sheet, comprising:

[0033] (1) Weaving thin copper wires with a diameter of 0.1mm into a metal cloth with a two-dimensional grid structure; cutting the appropriate size;

[0034] (2) Weigh 65g of copper powder, 15g of red phosphorus powder, 5g of tin powder, and 10g of solder powder and pour them into a container, add 5g of propylene carbonate, and fully stir with a stirrer for 1-2h to obtain the mass of the slurry and tin powder The score is 5%;

[0035] (3) Brush the slurry evenly on the surface of the metal cloth, and remove the excess slurry with a scraper;

[0036] (4) Put the metal cloth coated with slurry into a drying oven at 80°C for 1-2h; after drying, put it into a hot press, adjust the pressure to 4.3MPa, temperature 590°C, hot-press for 1-5h, take it out and clean it That's it.

[0037] Among them, heat treatment includes:

[0038] When the temperature reaches 232°C, the tin po...

Embodiment 2

[0041] This embodiment provides a method for preparing a copper-phosphorus brazing sheet. The difference from Embodiment 1 is (increase the pressure of hot pressing): the hot pressing condition is: the pressure is 10 MPa.

Embodiment 3

[0043] This embodiment provides a method for preparing a copper-phosphorus solder sheet, the difference from Embodiment 1 is:

[0044] Hot pressing includes: the first metallurgical stage and the second metallurgical stage;

[0045] The conditions of the first metallurgical stage: temperature 232°C; time 0.5h;

[0046] The conditions of the second metallurgical stage: temperature 590°C; time 2h.

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Abstract

The invention belongs to the technical field of brazing materials, and in particular relates to a copper-phosphorus brazing filler metal sheet and a preparation method thereof. The copper-phosphorus brazing solder sheet is obtained by coating the copper-phosphorus brazing paste with tin-containing copper-phosphorus solder paste on the surface of the copper wire mesh, and then hot pressing. In the present invention, tin powder is added to the copper-phosphorus solder slurry, and under the action of high temperature and pressure, the tin powder is used to undergo metallurgical reactions with the copper powder and the copper wire mesh skeleton in the slurry, so as to achieve the purpose of obtaining thin solder sheets by using hot pressing technology , which solves the problem that the existing rolling process cannot produce thinner copper-phosphorus brazing solder sheets with high tin content; and the brazing material in the solder sheet is more evenly distributed, on the one hand, it protects the powders from oxidation during the pressing process, on the other hand Lower the melting temperature and improve the wettability, thereby significantly improving the self-brazing properties of the solder sheet, which not only simplifies the actual brazing operation, saves additional solder, but also greatly shortens the production process of the copper-phosphorus solder solder sheet, improving production efficiency .

Description

technical field [0001] The invention belongs to the technical field of brazing materials, and in particular relates to a copper-phosphorus brazing filler metal sheet and a preparation method thereof. Background technique [0002] Solder refers to the filler added in the gap or beside the gap in order to realize the combination of two materials (or parts). Copper-phosphorus brazing material has low melting temperature, self-brazing property, good brazing process performance for copper alloy, and low price. It is widely used in brazing of copper alloy pipe fittings in electric power, refrigeration, radiator, sanitary ware and other industries. [0003] However, due to the brittle phase Cu contained in the copper-phosphorus solder 3 P, resulting in poor plasticity of the solder; at the same time, with the increase of phosphorus content, the brittleness of the solder increases sharply, so the technical difficulty of making thinner copper-phosphorus solder solder sheets through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/302B23K35/40
Inventor 韩晓辉刘勇武永寿徐野张志毅
Owner CRRC QINGDAO SIFANG CO LTD
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