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This study aims to systematically investigate the influence of Sn content a (a = 0, 10, 20, 30, 40, 50, 80, 99 at. %) on the wettability, interfacial structure, surface\/interface energy (\u03c3lv\/\u03c3sl), and adhesion behavior of the Cu\u2013aSn\u20131Cr\/Cgr system at 1100 \u00b0C. The experimental results show that as the Sn content increases, the equilibrium contact angle (\u03b8e) of the metal droplet shows a non-monotonic trend; the thickness of the reaction product layer (RPL, consisting of Cr carbides (CrmCn)) gradually increases, accompanied by a decrease in the calculated adhesion work (Wadcal). A \u201csandwich\u201d interface structure is observed, consisting of two interfaces: metal||CrmCn and CrmCn||Cgr. Sn content mainly affects the former. At metal||CrmCn, Sn exists in various forms (e.g., Cu\u2013Sn solid solution, CuxSny compounds) in contact with CrmCn. To elucidate the wetting and bonding mechanisms of metal||CrmCn, simplified interfacial models are constructed and analyzed based on first-principles calculations of density functional theory (DFT). The trend of theoretically calculated results (\u03c3metal and Wad) agrees with the experimental results (\u03c3lv and Wadcal). Further analysis of the partial density of state (PDOS) and charge density difference (CDD) reveals that charge distribution and bonding characteristics vary with Sn content, providing the microscopic insight into the nature of wettability and interfacial bonding strength.<\/jats:p>","DOI":"10.3390\/ma18081793","type":"journal-article","created":{"date-parts":[[2025,4,15]],"date-time":"2025-04-15T03:59:06Z","timestamp":1744689546000},"page":"1793","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Effect of Sn Content on Wettability and Interfacial Structure of Cu\u2013Sn\u2013Cr\/Graphite Systems: Experimental and First-Principles Investigations"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3544-3819","authenticated-orcid":false,"given":"Wenjuan","family":"Ci","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qiaoli","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xuefeng","family":"Lu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-5148-6461","authenticated-orcid":false,"given":"Yu","family":"Shi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Likai","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenkai","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou 730050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,14]]},"reference":[{"key":"ref_1","unstructured":"Inagaki, M., and Kang, F. 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