Materials Express最新文献_第10页

Enhancing amorphous carbon wear resistance at high contact stresses through Ag incorporation 通过加入银提高无定形碳在高接触应力下的耐磨性

IF 0.7 4区材料科学

Materials Express Pub Date : 2024-03-01 DOI: 10.1166/mex.2024.2681

Yan-yan Lin, Zhi-jun Deng

{"title":"Enhancing amorphous carbon wear resistance at high contact stresses through Ag incorporation","authors":"Yan-yan Lin, Zhi-jun Deng","doi":"10.1166/mex.2024.2681","DOIUrl":"https://doi.org/10.1166/mex.2024.2681","url":null,"abstract":"High load capacity is desirable in various industrial applications, such as gudgeon pins, cam followers, gears and bearings. Amorphous carbon (a-C) coatings, known for their minimal friction and low wear rates, have found extensive application in automotive components. However, the\u0000 a-C films often fail at high contact stress (>2 GPa). Extensive efforts have been devoted for the application of a-C under high contact stress, and a few groups can prevent the sudden failure of a-C in high load condition up to now. Nevertheless, the wear rate is still high, which is in\u0000 the range of ∼10−7 mm3/Nm, at least ten times greater than that of films under low stresses (<2 GPa). To tackle this issue, Ag-C supra-nano-dual-phase composite (SNDP) was fabricated using magnetron sputtering (‘supra-nano-dual-phase’ means the\u0000 diameter of each phase is smaller than 10 nm). Various methods were employed to examine the structural features, mechanical attributes, and tribological performance of Ag-C SNDP. The research revealed that Ag nanocrystals, ranging in size from 2 to 4 nm, were uniformly incorporated within\u0000 the amorphous carbon matrix. The Ag-C SNDP film with 4.0 at.% Ag shows an order of magnitude lower than amorphous carbon (a-C) at wear rate. It also pushes the load-bearing capacity as high as 4.0 GPa, which has rarely been reported before. The superior tribological behavior of Ag-C SNDP composite\u0000 can be explained in three factors: (1) the ‘supra-nanometer-sized dual-phase’ structure provides adequate strength; (2) the surface graphitization within several nanometers from the surface enables low friction coefficient and prevents sudden failure; (3) incorporating Ag into\u0000 the films resulted in a reduction in residual stress and an increase in film toughness.","PeriodicalId":18318,"journal":{"name":"Materials Express","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140091160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}