US 11,654,477 B2
Method for manufacturing aluminum alloy exterior material for smart device
Yun Soo Lee, Changwon-si (KR); Hyoung Wook Kim, Changwon-si (KR); Su Hyeon Kim, Changwon-si (KR); and Kwang Jun Euh, Changwon-si (KR)
Assigned to KOREA INSTITUTE OF MATERIALS SCIENCE, Changwon-si (KR)
Filed by KOREA INSTITUTE OF MACHINERY & MATERIALS, Daejeon (KR)
Filed on Nov. 1, 2019, as Appl. No. 16/672,419.
Claims priority of application No. 10-2019-0085588 (KR), filed on Jul. 16, 2019.
Prior Publication US 2021/0016344 A1, Jan. 21, 2021
Int. Cl. B22D 11/00 (2006.01); B22D 11/04 (2006.01); B22D 11/06 (2006.01); C25D 11/04 (2006.01); C22F 1/053 (2006.01); C22C 21/10 (2006.01)
CPC B22D 11/003 (2013.01) [B22D 11/008 (2013.01); B22D 11/0405 (2013.01); B22D 11/06 (2013.01); C22C 21/10 (2013.01); C22F 1/053 (2013.01); C25D 11/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for manufacturing an aluminum alloy exterior material for smart devices, the method comprising:
preparing a molten aluminum alloy;
casting the molten aluminum alloy into a sheet shape using a rotating mold to form an aluminum alloy cast sheet; and
anodizing the aluminum alloy cast sheet, wherein in the forming of an aluminum alloy cast sheet, X in Equation 1 below has a value in a range of greater than 0 to equal to or less than 0.15,
X=(WZn+WMg+WCu+WSi)/TC(wt %/(W/m·K))  <Equation 1>
where Wzn is the content (wt %) of the zinc (Zn) in the aluminum alloy, WMg is the content (wt %) of the magnesium (Mg) in the aluminum alloy, WCu is the content (wt %) of the copper (Cu) in the aluminum alloy and WSi is the content (wt %) of the silicon (Si) in the aluminum alloy, and where WZn+WMg+WCu+WSi is the total content (wt %) of the zinc (Zn), magnesium (Mg), copper (Cu) and silicon (Si) in the aluminum alloy, and TC is the thermal conductivity (W/m K) of the rotating mold,
wherein the aluminum alloy cast sheet comprises a 6000 series aluminum alloy or a 7000 series aluminum alloy,
wherein the rotating mold comprises a copper twin roll, and
wherein the copper twin roll has thermal conductivity in a range of 200 W/m·K to 500 W/m·K.