Femtosecond laser surface modification-based brazing of Si3N4 ceramics to 7A52 aluminum alloy
Source abstract
Abstract
This paper presents a method for joining Si3N4 and 7A52 aluminum alloy using femtosecond laser surface modification of Si3N4 ceramics. This study investigated the impact of laser scanning speed on the morphology, chemical composition, and wettability of Si3N4 ceramic surfaces, as well as the mechanism behind the laser-assisted joining of Si3N4 and 7A52. After undergoing femtosecond laser processing, the ceramic material underwent modifications resulting in the creation of a periodic groove structure. This structure featured an ideal depth-to-width ratio that effectively increased the surface area for bonding with the solder. Furthermore, the surface of Si3N4 experienced thermal decomposition, which produced a recrystallized layer of ‘Si.’ This layer improved the solder’s wetting effect on the ceramic surface, which led to a stronger diffusion of Al and Mg elements to the ceramic interface. The presence of the periodic groove structure also changed the fracture path of the joint, ultimately enhancing the strength of the brazed joint by approximately 52.4% when compared to the original joint. Notably, this significant improvement was achieved without the need for surface metallization. In summary, the femtosecond laser processing method significantly improved the strength of the ceramic–metal brazed joint through surface modifications, promoting a more reliable and robust bond.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · High-Temperature Coating Behaviors · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
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