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Open AccessArticle

Flux-Free Diffusion Joining of SiCp/6063 Al Matrix Composites Using Liquid Gallium with Nano-Copper Particles in Atmosphere Environment

1
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3
Faculty of Engineering, University of Rijeka, 51000 Rijeka, Croatia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 437; https://doi.org/10.3390/nano10030437
Received: 13 January 2020 / Revised: 18 February 2020 / Accepted: 27 February 2020 / Published: 29 February 2020
A new method for flux-free diffusion joining of aluminum matrix composites reinforced with SiC particles (SiCp/Al MMCs) in atmosphere environment has been developed. Liquid gallium and nano-copper particles were employed as filler metal under joining temperatures ranging between 400 °C to 480 °C, with a holding time of 2 h and pressure of 3 MPa. The results showed that 65 vol.% SiCp/6063 Al MMCs were successfully joined together. X-ray diffraction (XRD) analysis confirmed the presence of Ga2O3 at the fracture. Meanwhile, neither copper oxide nor aluminum oxide was detected. The formation of Ga2O3 can protect nano-copper particles and SiCp/6063 Al MMCs from oxidation. The width of weld seam tended to be narrowed from 40 μm to 14 μm gradually with increasing temperature from 400 °C to 480 °C. The maximum shear strength level of 41.2 MPa was achieved with a bonding temperature of 450 °C. The change of the strength was due to the adequate elements’ mutual diffusion and solution, as well as the change of the quantity and morphology of intermetallic compounds in the weld seam, such as Al2Cu and Cu3Ga. When the diffusion joining temperature reached 440 °C or above, the leak rate of the specimen remained under 10−10 Pa·m3/s. View Full-Text
Keywords: SiCp/Al matrix composites; diffusion joining; liquid gallium; nano-copper particles; microstructure SiCp/Al matrix composites; diffusion joining; liquid gallium; nano-copper particles; microstructure
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MDPI and ACS Style

Gao, Z.; Yang, H.; Feng, J.; Ji, F.; Niu, J.; Brnic, J. Flux-Free Diffusion Joining of SiCp/6063 Al Matrix Composites Using Liquid Gallium with Nano-Copper Particles in Atmosphere Environment. Nanomaterials 2020, 10, 437. https://doi.org/10.3390/nano10030437

AMA Style

Gao Z, Yang H, Feng J, Ji F, Niu J, Brnic J. Flux-Free Diffusion Joining of SiCp/6063 Al Matrix Composites Using Liquid Gallium with Nano-Copper Particles in Atmosphere Environment. Nanomaterials. 2020; 10(3):437. https://doi.org/10.3390/nano10030437

Chicago/Turabian Style

Gao, Zeng; Yang, Huanyu; Feng, Jianguang; Ji, Fei; Niu, Jitai; Brnic, Josip. 2020. "Flux-Free Diffusion Joining of SiCp/6063 Al Matrix Composites Using Liquid Gallium with Nano-Copper Particles in Atmosphere Environment" Nanomaterials 10, no. 3: 437. https://doi.org/10.3390/nano10030437

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