Non-solder brass solder coating material for aluminium product

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 ...

Examples

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.

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 ...

Examples

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.