Self-brazing aluminum alloy laminar composite and preparation method and application thereof

A technology of aluminum alloy layer and composite material, which is applied in the field of aluminum alloy brazing to achieve the effects of easy surface treatment, high brazing pass rate, and bright and smooth surface

Inactive Publication Date: 2020-10-30
上海萨新东台热传输材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a self-brazing aluminum alloy layered composite material, a manufacturing method and its application, which can overcome a series of problems caused by the traditional brazing process requiring the addition of flux. Through the short-flow brazing process, both Reduce user equipment investment, and greatly reduce production costs, while improving production efficiency and brazing quality

Method used

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  • Self-brazing aluminum alloy laminar composite and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1, powder mixing and pressing: the raw material is Al-Si alloy powder containing 4% Si by mass; the flux powder composition is: 28% K, 17% Al, 53% F, ≤0.03% Fe, ≤0.02% Ca, ≤2.5%H 2 O: The two powders with a flux powder content of 6% by mass are fully mechanically mixed and uniformly pressed into a rectangular parallelepiped shape of 8mm*600mm*800 by a press.

[0046] Wherein, the chemical composition mass percent of Al-Si alloy powder is:

[0047] Al Si Fe Cu mn Mg Ti Zn 95.789 4 0.15 0.003 0.05 0.001 0.002 0.015

[0048] S2, heating: the core material ingot is combined with the single brazing layer alloy plate made by S1, and then heated to 490°C in the furnace and kept for 2 hours;

[0049] S3, hot-rolled composite: hot-rolled billet thickness 8mm;

[0050] S4, cold rolling: After 3 passes of cold rolling to 2mm, the total processing rate is 75%;

[0051] S5, finished product annealing: the finished product annealing temperat...

Embodiment 2

[0054] S1, powder mixing and pressing: the raw material is Al-Si alloy powder containing 10.5% Si by mass; the flux powder composition is: 31% K, 16% Al, 52.5% F, ≤0.03% Fe, ≤0.02% Ca, ≤2.5%H 2 O: The two powders with a flux content of 3% by mass are fully mechanically mixed and pressed into a rectangular parallelepiped shape of 8mm*600mm*800 by a press.

[0055] Wherein, the chemical composition mass percent of Al-Si alloy powder is:

[0056] Al Si Fe Cu mn Mg Ti Zn 89.279 10.5 0.15 0.003 0.05 0.001 0.002 0.015

[0057] S2, heating: the core material ingot is combined with the single brazing layer alloy plate made by S1, and then heated to 490°C in the furnace and kept for 2 hours;

[0058] S3, hot-rolled composite: hot-rolled billet thickness 6mm;

[0059] S4, cold rolling: after 5 passes of cold rolling to 0.5mm, the total processing rate is 83.3%;

[0060] S5, finished product annealing: the finished product annealing temperature i...

Embodiment 3

[0063] S1, powder mixing and pressing: the raw material is Al-Si alloy powder containing 13% Si by mass; the flux powder composition is: 29.5% K, 17.8% Al, 52.2% F, ≤0.03% Fe, ≤0.02% Ca, ≤2.5%H 2 O: The two powders with a flux content of 0.1% by mass are fully mechanically mixed and then pressed into a rectangular parallelepiped shape of 8mm*600mm*800 by a press.

[0064] Wherein, the chemical composition mass percent of Al-Si alloy powder is:

[0065] Al Si Fe Cu mn Mg Ti Zn 86.842 13 0.11 0.003 0.03 0.001 0.002 0.012

[0066] S2, heating: the core material ingot is combined with the double-sided brazing layer alloy plate made by S1, then heated to 500°C in the furnace, and kept for 2 hours;

[0067] S3, hot-rolled composite: hot-rolled billet thickness 8mm;

[0068] S4, cold rolling: After 2 passes of cold rolling to 4mm, the total processing rate is 50%;

[0069] S5, finished product annealing: the finished product annealing tempera...

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Abstract

The invention relates to a self-brazing aluminum alloy laminar composite and a preparation method and application thereof. The self-brazing aluminum alloy laminar composite comprises at least one self-brazing aluminum alloy layer. The self-brazing aluminum alloy layer is formed by mixing and pressing Al-Si brazing alloy powder and brazing flux powder, wherein the mass percentage of the content ofthe brazing flux powder is 0.1%-10%, and the mass percentage of Si in the Al-Si brazing alloy powder is 4%-13%. The preparation method comprises a series of manufacturing steps of mixing and pressing,heating, hot rolling compounding, cold rolling, finished product annealing, finishing and packaging and the like, and then the self-brazing aluminum alloy laminar composite is manufactured. An appropriate amount of brazing flux is added and evenly distributed in the brazing alloy layer, so that the brazing quality of a brazed piece is stable and reliable, the yield of one-time brazing is high, the surface of the brazed piece is bright and smooth, and follow-up surface treatment is easy; and brazing flux spraying of a traditional brazing technology is omitted, and therefore pollution to a production environment is avoided.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy brazing, in particular to a self-brazing aluminum alloy layered composite material, a preparation method and an application. Background technique [0002] Brazing technology uses a brazing alloy with a lower melting point than the base metal as the solder, heats the weldment and the solder to a temperature higher than the melting point of the solder but lower than the melting point of the base metal, and fills the joint with the wetting action of the liquid solder Gap, a method of interdiffusion with the base metal to realize the connection of the workpiece to be welded. The brazing processes of aluminum and aluminum alloys mainly include vacuum brazing, flux brazing, dip brazing, flame brazing, etc. Among them, vacuum brazing and flux brazing have higher product quality and production efficiency, so they are widely used For the manufacture of brazed aluminum heat exchangers, with the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 姜之韬
Owner 上海萨新东台热传输材料有限公司
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