US 12,269,129 B2
Aluminum alloy brazing sheet and manufacturing method thereof
Tomoki Yamayoshi, Tokyo (JP); Hidetoshi Kumagai, Tokyo (JP); Hirokazu Tanaka, Tokyo (JP); Taketoshi Toyama, Kariya (JP); Naoki Sugimoto, Kariya (JP); Nobuhiro Honma, Kariya (JP); Shogo Yamada, Kariya (JP); and Takahiro Shinoda, Kariya (JP)
Assigned to UACJ CORPORATION, Tokyo (JP)
Appl. No. 17/630,006
Filed by UACJ Corporation, Tokyo (JP)
PCT Filed Jul. 6, 2020, PCT No. PCT/JP2020/026325
§ 371(c)(1), (2) Date Jan. 25, 2022,
PCT Pub. No. WO2021/020037, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-137541 (JP), filed on Jul. 26, 2019.
Prior Publication US 2022/0250195 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C22F 1/04 (2006.01); B23K 35/02 (2006.01); B23K 35/28 (2006.01); C21D 9/46 (2006.01); C22C 21/08 (2006.01); C22F 1/047 (2006.01); B23K 103/10 (2006.01)
CPC B23K 35/288 (2013.01) [B23K 35/0233 (2013.01); C21D 9/46 (2013.01); C22C 21/08 (2013.01); C22F 1/047 (2013.01); B23K 2103/10 (2018.08)] 13 Claims
 
1. An aluminum alloy brazing sheet used for brazing of an aluminum material in an inert gas atmosphere or in vacuum and
formed of a two-layer material in which a brazing material and a core material are stacked in this order,
the core material being formed of an aluminum alloy and having a grain size of 20 to 300μm, the aluminum alloy comprising Mn of 0.50 to 2.00 mass %, Mg of 0.40 to 2.00 mass %, Si of 1.50 mass % or less, and Fe of 1.00 mass % or less, and optionally at least one of Ti of 0.30 mass % or less, Cu of 1.20 mass % or less, Zr of 0.30 mass % or less, and Cr of 0.30mass % or less, with the balance being aluminum and inevitable impurities,
the brazing material being formed of an aluminum alloy comprising Si of 4.00 to 13.00mass % and further comprising at least one of Mn of 2.00 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, and Cr of 0.30 mass % or less, and at least one of Bi of 1.00 mass % or less, Na of 0.050 mass % or less, Sr of 0.050 mass % or less, Sb of 0.050 mass % or less, Mg of 2.00 mass % or less, Zn of 8.00 mass % or less, Cu of 4.00mass % or less, In of 0.100 mass % or less, Sn of 0.100 mass % or less, and Fe of 1.00 mass % or less, with the balance being aluminum and inevitable impurities, and
in a drop-type fluidity test, a ratio α (α=Ka/Kb) of a fluid coefficient Ka after a 5% strain is applied to a fluid coefficient Kb before the strain is applied being 0.55 or more.