Aluminum alloy for brazing and aluminum brazing sheet

A technology for aluminum alloys and brazing sheets, which is applied in the field of aluminum alloys for flux-free brazing and aluminum brazing sheets for flux-free brazing, and can solve problems such as unstable joint states

Active Publication Date: 2020-01-14
MA ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even when this technique is used, the MgO film grows on the surface of the molten brazing material, and the joint state tends to become unstable.

Method used

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  • Aluminum alloy for brazing and aluminum brazing sheet
  • Aluminum alloy for brazing and aluminum brazing sheet
  • Aluminum alloy for brazing and aluminum brazing sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] For various bare materials with the compositions shown in Nos. 1 to 30 in Table 1 and Nos. 62 to 71 in Table 2 (the rest is Al and unavoidable impurities), the casting conditions and heat shown in Table 5 Under rolling conditions, hot-rolled sheets were fabricated. In addition, as shown in Table 3 and Table 4, No. 1 to 30 and No. 62 to 71 were not covered with brazing filler metal.

[0125] Then, by cold rolling including an intermediate annealing step, a cold-rolled sheet with a thickness of 0.10 mm in H14 equivalent temper was produced and formed into a corrugated fin shape.

[0126] In addition, as a brazing target member, a brazing sheet having a plate thickness of 0.3 mm was produced, and the brazing sheet contained a brazing filler metal containing 10% of Si and 0.5% of Mg by mass % and A3003 at a coating rate of 10%. The core material of the alloy was assembled, and a tube having a width of 25 mm with the brazing filler metal surface on the outside was molded. ...

Embodiment 2

[0129] For Nos.31 to 61 of Table 1 and Table 3 (Table 1: Core material, Table 3: Brazing material), No.72 to 79 of Table 2 and Table 4 (Table 2: Core material, Table 4: Brazing material) Various brazing sheets having the compositions shown (the remainder being Al and unavoidable impurities) were produced as hot-rolled sheets under the casting conditions and hot-rolling conditions shown in Table 5.

[0130] Then, by cold rolling including an intermediate annealing step, a cold-rolled sheet having a thickness of 0.30 mm in the H14 equivalent temper was produced. In addition, in the brazing sheet, the coating rate of the brazing filler metal was set to 10%.

[0131] In addition, corrugated fins of A3003 alloy and H14 aluminum bare material (thickness 0.1 mm) were prepared as brazing target members.

[0132] A pipe with a width of 25 mm was produced using the brazing sheet, and the pipe and corrugated fins were combined so that the brazing material of the pipe was in contact with...

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Abstract

The invention provides an aluminum alloy for brazing without scaling powder. Brazing filler metal is supplied to brazing performed in a flux-free manner through Al-Si-based brazing filler metal in a non-oxidizing atmosphere not accompanied by pressure reduction. The aluminum alloy contains, in mass%, 0.01-2.0% of Mg and 0.005-1.5% of Bi. For the Mg-Bi-based compound contained in the aluminum alloy, in a cross-section parallel to the rolling direction before brazing, more than 10 Mg-Bi-based compounds having a diameter of 0.01 [mu]m or more and less than 5.0 [mu]m in terms of equivalent circlediameter are present per 10,000 [mu]m<2> of field of view. Furthermore, the number of Mg-Bi-based compounds having a diameter of 5.0 [mu]m or more is less than 2 per 10,000 [mu]m<2> of the field of view. Furthermore, in a cross-section parallel to the rolling direction before brazing, the number of Bi elementary substance particles contained in the aluminum alloy is less than 5 per 10,000 [mu]m<2>of field of view, said Bi elementary substance particles having a diameter of 5.0 [mu]m or more in terms of equivalent circle diameter.

Description

technical field [0001] The present invention relates to an aluminum alloy for flux-free brazing and an aluminum brazing sheet for flux-free brazing, which are used for flux-free brazing. Background technique [0002] With regard to heat exchangers for automobiles made of aluminum such as radiators, the aluminum material has become thinner and stronger in line with the previous miniaturization and weight reduction. In the manufacturing process of aluminum heat exchangers, brazing is performed to join the joints, but in the current mainstream brazing method using fluoride-based fluxes, the fluxes are not activated because they react with Mg in the material In addition, poor brazing is likely to occur, so the utilization of Mg-added high-strength components is limited. Therefore, a brazing method for joining Mg-added aluminum alloys without using flux is desired. [0003] In flux-free soldering using Al-Si-Mg solder, the Al oxide film (Al 2 o 3 ) undergo reductive decomposi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/02C22C21/08C22C21/10C22C21/14C22C21/16B23K35/28B32B15/01B32B15/20
CPCC22C21/02C22C21/00C22C21/08C22C21/14C22C21/16C22C21/10B23K35/286B23K35/288B32B15/016B23K35/0238F28F21/084C22F1/00C22F1/04C22F1/043C22F1/047C22F1/05C22F1/053C22F1/057F28D1/05366F28F1/126F28F2275/045C22C21/06
Inventor 森祥基三宅秀幸吉野路英岩尾祥平江戸正和
Owner MA ALUMINUM CORP
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