Brazing filler metal paste for stainless steel flux-free brazing, preparation method of brazing filler metal paste, copper-manganese-nickel-cobalt brazing filler metal and application thereof

A solder paste, stainless steel technology, used in welding equipment, welding/cutting media/materials, welding media, etc., can solve problems such as pollution of the environment, leakage, and growth of stainless steel grains

Pending Publication Date: 2021-11-02
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing H1CuNi30-2-0.2 solder does not have self-brazing properties. When brazing stainless steel in an atmosphere furnace, the dense oxide film on the surface of the stainless steel is difficult to remove when the brazing temperature is lower than 1000 ° C. When the temperature is higher than 1000 ° C The grain growth of stainless steel affects the welding quality of stainless steel and the cost is high
When H1CuNi30-2-0.2 copper-based solder uses flux to braze stainless steel in an atmospheric environment, a better joint can be obtained. However, most of the flux contains fluoride, which is volatile during brazing, pollutes the environment, and endangers human health; Residual flux residues are highly corrosive and easily corrode stainless steel pipelines, causing leakage and affecting the service life of stainless steel heat exchangers

Method used

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  • Brazing filler metal paste for stainless steel flux-free brazing, preparation method of brazing filler metal paste, copper-manganese-nickel-cobalt brazing filler metal and application thereof
  • Brazing filler metal paste for stainless steel flux-free brazing, preparation method of brazing filler metal paste, copper-manganese-nickel-cobalt brazing filler metal and application thereof
  • Brazing filler metal paste for stainless steel flux-free brazing, preparation method of brazing filler metal paste, copper-manganese-nickel-cobalt brazing filler metal and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of the solder paste for stainless steel flux-free brazing of the present embodiment, the parts by weight of the raw materials used consist of: 70 parts of copper-based solder powder, 3 parts of nano silicon dioxide, 3 parts of sodium hydroxide, 10 parts of deionized water; the mass percent of each component in the copper-based solder powder is: Mn26.0%, Ni26.0%, Co4.0%, B0.1%, Li0.1%, Na0.1% , K0.01%, Cu balance.

[0038] Prepared using the following steps:

[0039] (1) Take each component in proportion, and first dissolve sodium hydroxide in deionized water to form an alkaline aqueous solution for subsequent use;

[0040] (2) Add nano-silica (30-50nm) into step (1) alkaline aqueous solution, put it in a high-pressure reactor, and react for 3.0 hours under 0.3MPa steam pressure to form a suspension (transparent colloidal liquid + a small amount of silicon dioxide); the schematic diagram of the reaction process is as figure 1 shown;

[0041] (3...

Embodiment 2

[0043]The preparation method of the solder paste for stainless steel flux-free brazing of the present embodiment, the parts by weight of the raw materials used consist of: 72 parts of copper-based solder powder, 4 parts of nano silicon dioxide, 2 parts of sodium hydroxide, 11 parts of deionized water; the mass percent of each component in the copper-based solder powder is: Mn27.0%, Ni27.0%, Co5.0%, B0.2%, Li0.2%, Na0.1% , K0.1%, Cu balance. The specific preparation method is basically the same as that of Example 1, except that in step (2), the steam pressure is 0.4 MPa, and the reaction time is 4.0 h.

Embodiment 3

[0045] The preparation method of the solder paste for stainless steel flux-free brazing of the present embodiment, the parts by weight of the raw materials used consist of: 74 parts of copper-based solder powder, 5 parts of nano silicon dioxide, 1 part of sodium hydroxide, 12 parts deionized water. The mass percentage of each component in copper-based solder powder is: Mn28.0%, Ni28.0%, Co6.0%, B0.3%, Li0.4%, Na0.2%, K0.15%, Cu margin.

[0046] The specific preparation method is basically the same as that of Example 1, except that in step (2), the steam pressure is 0.5 MPa, and the reaction time is 5.0 h.

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Abstract

The invention belongs to the technical field of brazing materials, and particularly relates to brazing filler metal paste for stainless steel flux-free brazing, a preparation method of the brazing filler metal paste, copper-manganese-nickel-cobalt brazing filler metal and application thereof. The brazing filler metal paste is mainly composed of water, sodium silicate, nano silicon dioxide and copper-based brazing filler metal. The brazing filler metal paste is prepared from the following raw materials in parts by weight: 70-80 parts of copper-based brazing filler metal, 3-5 parts of nano silicon dioxide, 1-3 parts of sodium hydroxide and 10-15 parts of water. According to the brazing filler metal paste, the paste containing water, sodium silicate and nano-silicon dioxide is dehydrated at high temperature to form a film during brazing, and the nano-silicon dioxide can construct a three-dimensional network structure, has a huge surface area and great activity, and can enhance the strength and high temperature resistance of the film to form a high-temperature-resistant film. The thin film isolates air and protects the brazed surface, molten brazing filler metal is not oxidized, and brazing flux-free brazing of stainless steel in the atmospheric environment is achieved. And meanwhile, the nano silicon dioxide particles are pinned in the brazing seam, so that the strength of the stainless steel joint is enhanced.

Description

technical field [0001] The invention belongs to the technical field of brazing materials, and in particular relates to a solder paste for stainless steel flux-free brazing, a preparation method thereof, a copper-manganese-nickel-cobalt solder and applications thereof. Background technique [0002] Stainless steel has superior high temperature performance and good corrosion resistance, and is widely used in the manufacture of heat exchanger piping. In recent years, stainless steel heat exchangers have become heat exchange devices commonly used in metallurgy, chemical industry, energy, transportation, light industry, food and other industrial sectors. Brazing is a key link in the manufacture of stainless steel heat exchanger piping, which determines the service life of the heat exchanger. With the improvement of people's quality of life, the requirements for the welding quality of stainless steel heat exchangers are getting higher and higher. The welding quality of stainless...

Claims

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Application Information

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IPC IPC(8): B23K35/02B23K35/30B23K35/40B23K1/002
CPCB23K35/025B23K35/302B23K35/40B23K1/002
Inventor 龙伟民钟素娟黄俊兰裴夤崟张冠星薛行雁聂孟杰李文彬
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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