US 12,227,423 B2
Silicon-aluminum alloy and preparation method therefor
Xuemin Chen, Guangdong (CN); Ronald Ray Duckworth, Guangdong (CN); Yueming Yu, Guangdong (CN); Qingchao Wang, Guangdong (CN); and Zhi Zhou, Guangdong (CN)
Assigned to SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO., LTD., Guangdong (CN)
Appl. No. 17/802,970
Filed by SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO., LTD., Guangdong (CN)
PCT Filed May 28, 2020, PCT No. PCT/CN2020/092956
§ 371(c)(1), (2) Date Nov. 28, 2022,
PCT Pub. No. WO2021/169073, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 202010131433.6 (CN), filed on Feb. 28, 2020.
Prior Publication US 2023/0094357 A1, Mar. 30, 2023
Int. Cl. C01B 33/02 (2006.01); C01B 33/021 (2006.01); C22C 1/047 (2023.01); C22C 21/02 (2006.01); C22C 21/04 (2006.01)
CPC C01B 33/02 (2013.01) [C01B 33/021 (2013.01); C22C 1/047 (2023.01); C22C 21/02 (2013.01); C22C 21/04 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A preparation method of a silicon-aluminum alloy, the preparation method comprising the following steps:
Step S1, adding metal aluminum or molten aluminum into a container, wherein the temperature of the molten aluminum is between 700° C. and 800° C.;
Step S2, adding a semi-metallic silicon raw material into the molten aluminum, closing a furnace cover, carrying out vacuumization, and introducing argon to ensure that the interior of a magnetic induction furnace is in a positive-pressure state, and stirring the aluminum metal or molten aluminum with a graphite stirring head;
Step S3, powering on and heating so that the aluminum metal or molten aluminum is heated to 1000° C. or above and molten, and holding the temperature between 1000° C. and 1500° C., wherein the metal aluminum and silicon mostly form an intermetallic compound in this process and the time of the alloying process is between 30 min and 2 h; and
Step S4, after alloying is completed, cooling to 1000° C. or below, opening the furnace cover, pouring the silicon-aluminum alloy into a corresponding mold, and cooling for molding, wherein the silicon-aluminum alloy being molded comprises, by weight, 55% to 90% of silicon and the balance of aluminum and impurities.