US 12,435,428 B2
High-pressure and multi-atmosphere assisted SLM gradient material preparation method and aluminum-lithium alloy coating
Lei Huang, Jiangsu (CN); Jianzhong Zhou, Jiangsu (CN); Yanqiang Gou, Jiangsu (CN); Li Li, Jiangsu (CN); Xiankai Meng, Jiangsu (CN); and Shu Huang, Jiangsu (CN)
Assigned to Jiangsu University, Jiangsu (CN)
Appl. No. 19/117,465
Filed by Jiangsu University, Jiangsu (CN)
PCT Filed Jan. 11, 2024, PCT No. PCT/CN2024/071711
§ 371(c)(1), (2) Date Apr. 1, 2025,
PCT Pub. No. WO2025/138349, PCT Pub. Date Jul. 3, 2025.
Claims priority of application No. 202311794170.7 (CN), filed on Dec. 25, 2023.
Prior Publication US 2025/0257467 A1, Aug. 14, 2025
Int. Cl. C23C 24/10 (2006.01); B22F 10/28 (2021.01); B22F 10/50 (2021.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); C23C 8/30 (2006.01)
CPC C23C 24/106 (2013.01) [B22F 10/28 (2021.01); B22F 10/50 (2021.01); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12); C23C 8/30 (2013.01); B22F 2201/02 (2013.01); B22F 2201/04 (2013.01); B22F 2301/052 (2013.01); B22F 2998/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A high-pressure and multi-atmosphere assisted selective laser melting (SLM) gradient material preparation method, comprising the following steps:
continuously injecting a first gas mixture into an airtight working box to maintain a high-pressure environment in the airtight working box, wherein the first gas mixture is a gas mixture of an inert gas and a carbon-containing active gas; and irradiating aluminum-lithium alloy powder laid on a surface of a substrate with a laser to form a micro-melt pool, and enabling molten materials in the micro-melt pool to react with the carbon-containing active gas to form a carbide-doped first gradient aluminum-lithium alloy coating;
discharging the first gas mixture out of the airtight working box; continuously injecting a second gas mixture into the airtight working box to maintain a high-pressure environment in the airtight working box, wherein the second gas mixture is a gas mixture of an inert gas and a carbon and nitrogen-containing active gas; irradiating aluminum-lithium alloy powder laid on a surface of the carbide-doped first gradient aluminum-lithium alloy coating with the laser to form a micro-melt pool, and enabling molten materials in the micro-melt pool to react with the carbon and nitrogen-containing active gas to form a carbide and nitride-doped second gradient aluminum-lithium alloy coating; and
discharging the second gas mixture out of the airtight working box; continuously injecting a third gas mixture into the airtight working box to maintain a high-pressure environment in the airtight working box, wherein the third gas mixture is a gas mixture of an inert gas and a nitrogen-containing active gas; irradiating aluminum-lithium alloy powder laid on a surface of the carbide and nitride-doped second gradient aluminum-lithium alloy coating with the laser to form a micro-melt pool, and enabling molten materials in the micro-melt pool to react with the nitrogen-containing active gas to form a nitride-doped third gradient aluminum-lithium alloy coating,
wherein, a pressure of the high-pressure environment created by the first gas mixture is P1, a pressure of the high-pressure environment created by the second gas mixture is P2, a pressure of the high-pressure environment created by the third gas mixture is P3, and P1>P2>P3; the pressure P1 of the high-pressure environment created by the first gas mixture is 3.5-5.0 MPa, the pressure P2 of the high-pressure environment created by the second gas mixture is 2.0-2.5 MPa, and the pressure P3 of the high-pressure environment created by the third gas mixture is 1.0-1.5 MPa.