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Brazing sheet for heat exchanger and manufacturing method thereof

A technology for heat exchangers and manufacturing methods, which is applied in the field of fin materials, can solve the problems that it is difficult to prevent buckling of fins, and does not specifically mention the precipitation of core material structures, so as to prevent preferential corrosion, excellent buckling performance, and realize The effect of longevity

Active Publication Date: 2018-03-20
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 2 also describes that the structure before brazing heating is preferably a fibrous structure, and that it is difficult to prevent buckling of the fins during brazing heating due to thinning of the fins.
In addition, there is no specific mention of precipitates in the core structure

Method used

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  • Brazing sheet for heat exchanger and manufacturing method thereof
  • Brazing sheet for heat exchanger and manufacturing method thereof
  • Brazing sheet for heat exchanger and manufacturing method thereof

Examples

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Embodiment

[0059] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0060] Table 1 shows the alloy compositions of the core materials used in this example. An ingot having a size of 258 mm×790 mm×1600 mm was produced using an alloy having a composition of A1 to A23, and face cutting was performed. Next, a skin material having an alloy composition of B1 to B9 shown in Table 2 was coated on both sides of the core alloy at a coverage rate of 4% to 16%, and sample Nos. 1 to 42 shown in Table 3 were prepared. cladding material. Then, after heating at 410°C to 520°C for 3 hours, hot rolling to 3.5mm, cold rolling to a specified thickness, intermediate annealing at 370°C for 2 hours, and further cold rolling to produce a thickness A brazing sheet of 60 μm, and a brazing sheet having a plate thickness of 30 μm are used for reference.

[0061][Table 1]

[0062]

[0063] [Table 2]

[0064] Table 2 ...

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Abstract

An aluminum alloy brazing sheet for heat exchangers, and a method for producing the same, wherein the aluminum alloy brazing sheet for heat exchangers contains 0.6-2.0 mass % Mn, 0.05-0.5 mass % Fe, 0.4-0.9 mass % % Si, 0.02 to 4.0 mass % of Zn, and an Al alloy composed of Al and inevitable impurities in the remainder as a core material, and both sides of the core material contain 6.0 to 13.0 mass % of Si, 0.05 to 0.80 mass % Fe, 0.05 to 0.45 mass % of Cu, and an Al alloy composed of Al and unavoidable impurities as the skin material, the particle size of the Al-Mn-Fe system and the Al-Mn-Si system in the core material is The ratio A / B of the number density A (pieces / mm2) occupied by the precipitates with a particle size of 0.1 μm or more and less than 3.0 μm and the number density B (pieces / mm2) of the precipitates with a particle size of 3.0 μm or more satisfies 50≤ A / B≦500, and the average crystal grain diameter of the core material in the longitudinal section of the fin after brazing heating is 100 μm or more.

Description

technical field [0001] The present invention relates to a heat exchanger excellent in durability against corrosion and a fin material used therein, and in particular to a heat exchanger useful in automotive applications such as condensers, evaporators, oil coolers, and radiators for automotive air conditioners and the like Heat exchangers such as condensers for room air conditioners and fin materials used therein. Background technique [0002] Aluminum alloys are light in weight and have excellent thermal conductivity, high corrosion resistance can be achieved by appropriate treatment, and efficient joining can be achieved by brazing with brazing sheets, so they are often used as materials for heat exchangers such as automobiles to use. However, in recent years, in order to improve the performance of automobiles and respond to the environment, it is required to improve the performance of heat exchangers to have lighter weight and higher durability, and an aluminum alloy mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00B23K35/22B23K35/28C22F1/04F28F21/08C22F1/00
CPCB23K35/0238B23K35/286B23K35/288B32B15/016C22C21/00C22C21/02C22C21/04C22C21/10C22F1/00C22F1/04C22F1/043F28F21/084F28F21/089F28F2275/04B23K35/22B23K35/28C22C21/08F28F21/08
Inventor 菅野能昌田中哲寺山和子
Owner FURUKAWA SKY ALUMINUM CORP