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To address the urgent demand for long-service capability space conductive slip rings in the aerospace field, the running-in behavior and failure mechanism between the AgCuNi alloy and Au-electroplated layer are investigated using a ball-on-disc tribometer in this paper. The results show that the transfer film composed of Au plays an important role in modifying the friction during the sliding process. With the accumulation of wear debris composed of Ag on the disc, the contact material of the friction pair changed from Au and Au to Au, Ag and Au, so the surface roughness of wear tracks increased. Finally, the transfer film broke, which made the layer fail. This paper reveals the key element failure mechanism that causes transfer film failure in the running-in contact area, which is used to reveal the friction behavior and failure mechanism of slip ring friction pair materials, and provides a basis for the selection of running-in parameters during the running-in process of slip rings before power-on operation.<\/jats:p>","DOI":"10.3390\/s25010107","type":"journal-article","created":{"date-parts":[[2024,12,27]],"date-time":"2024-12-27T09:13:32Z","timestamp":1735290812000},"page":"107","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Running-In Behavior and Failure Mechanism Between AgCuNi Alloy and Au-Electroplated Layer"],"prefix":"10.3390","volume":"25","author":[{"given":"Hongjian","family":"Wu","sequence":"first","affiliation":[{"name":"College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471023, China"},{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya\u2019nan","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"},{"name":"College of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingjian","family":"Jia","sequence":"additional","affiliation":[{"name":"China Academy of Space Technology (Xi\u2019an), Xi\u2019an 710100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Cao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,12,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1016\/j.triboint.2018.06.028","article-title":"Friction and wear properties of MoS2-based coatings sliding against Cu and Al under electric current","volume":"127","author":"Wang","year":"2018","journal-title":"Tribol. 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