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Non-solder brass solder coating material for aluminium product

A technology of coating materials and aluminum products, applied in the field of materials, can solve problems such as prolonged heating process time, increased production energy consumption, and reduced production efficiency, and achieve simple and reliable brazing process, overcome complex processes, and excellent brazing effect Effect

Inactive Publication Date: 2005-11-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After experimental research, it is found that this coating material preparation technology has several deficiencies in the actual use process: first, affected by the degree and speed of the replacement reaction, the amount of silicon element and potassium fluoroaluminate is limited, reducing the The ability of metallurgical bonding of brazed joints; second, in order to ensure the progress of the replacement reaction, the heating process time needs to be greatly extended, which increases production energy consumption and reduces production efficiency; third, this type of coating material is suitable for continuous The control temperature and atmosphere control of CAB furnace put forward higher requirements, which increases the difficulty and cost of equipment transformation for enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The composition and weight percentage of the present invention are: 30% of silicon powder, 30% of potassium fluoroaluminate, and the rest is synthetic resin.

[0014] The silicon powder has an average particle size of more than 600 meshes (ie, average particle size ≤ 20um), a purity of ≥ 99.3%, and its composition complies with the national A-level standard for industrial silicon GB 2881-91.

[0015] The average particle size of the potassium fluoroaluminate is controlled below ≤10um.

[0016] The powder ratio of the silicon powder and potassium fluoroaluminate is 1:1.

[0017] After using the present invention, the brazed seam is basically good, and the seam in the place with good contact is especially good.

Embodiment 2

[0019] The composition and weight percentage of the present invention are: 30% of silicon powder, 20% of potassium fluoroaluminate, and the rest is synthetic resin.

[0020] The silicon powder has an average particle size of more than 600 meshes (ie, average particle size ≤ 20um), a purity of ≥ 99.3%, and its composition complies with the national A-level standard for industrial silicon GB 2881-91.

[0021] The average particle size of the potassium fluoroaluminate is controlled below ≤10um.

[0022] The powder ratio of the silicon powder and potassium fluoroaluminate is 3:2.

[0023] After using the present invention, the brazing seam is not good, and there are many false welded parts.

Embodiment 3

[0025] The composition and weight percentage of the present invention are: 40% of silicon powder, 20% of potassium fluoroaluminate, and the rest is synthetic resin.

[0026] The silicon powder has an average particle size of more than 600 meshes (ie, average particle size ≤ 20um), a purity of ≥ 99.3%, and its composition complies with the national A-level standard for industrial silicon GB 2881-91.

[0027] The average particle size of the potassium fluoroaluminate is controlled below ≤10um.

[0028] The powder ratio of the silicon powder and potassium fluoroaluminate is 2:1.

[0029] After using the invention, the quality of the brazing seam is good, and the transition of the seam joint is smooth.

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Abstract

Soldered coating material without solder of aluminum product belongs to material engineering technique field. The components and corresponding weight shares are: silica flour 30í½49úÑ, potassium aluminium fluoride 20í½30úÑ and synthetic resin. Paint the coating prepared by rolling transfer application on aluminium surface of flat separation with coating thickness under 40um; dry the coating at 150Degí½220 Deg, then it presents outstanding effect in continual CAB braze welding technique and achieves advanced level in domestic and foreign. This invention overcomes the existing complex technique, increases reliability and stability of soldered joint.

Description

technical field [0001] The invention relates to a coating in the technical field of materials, in particular to a brazing coating material for aluminum products without solder. Background technique [0002] Based on the application limitations of traditional coating materials, researchers at home and abroad have begun to propose the principle of diffusion brazing seam formation using the contact reaction of silicon element and aluminum material to obtain the liquid-phase brazing filler metal necessary for brazing at high temperature, so as to get rid of the brazing. Process requirements for material coating and plating. At the same time, coating technology can be used to prepare brazing flux and silicon simple substance powder into coatings and coat them on the surface of aluminum materials, simplifying the technological requirements for brazing flux coating. In the field of aluminum heat exchanger manufacturing, the technical research of preparing a new type of coating on ...

Claims

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Application Information

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IPC IPC(8): B23K35/363
Inventor 钟元龙王俊孙宝德李克
Owner SHANGHAI JIAO TONG UNIV
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