{"title":"Microscopic characterization and tribological properties of boron-doped microtextured spherical diamond composite coatings","authors":"Daohui Xiang, Jun Zhang, Zhiqiang Zhang, Yu Zhang, Zhong Cheng, Chaosheng Song, Yanqin Li, Guofu Gao, Jinglin Tong","doi":"10.1016/j.ijrmhm.2025.107054","DOIUrl":null,"url":null,"abstract":"<div><div>Since the poor abrasion resistance and adhesion strength of ordinary CVD diamond coatings and the single shape of the substrate have seriously limited the development of diamond surface coating technology in the machining industry, the study of the adhesion and tribological properties of diamond coatings under different shapes of substrates is necessary to solve this problem. In this study, diamond coatings were prepared on the spherical surface of cemented carbide, combining surface micro-texturing, boron doping, and composite coating techniques to investigate diamond coatings' adhesion strength and friction properties. Research Methodology: Diamond spherical films with different micro-texturing and coating types were processed on the spherical surface of WC-Co cemented carbide by laser etching and hot filament chemical vapor deposition (HFCVD). Adhesion and tribological properties of spherical diamond films were studied by indentation and friction experiments. Study results: The optimum boron doping concentration was near 4000 ppm; Concentric square groove boron doped micro/nanodiamond (SGBDM/NCD) spherical films showed the smallest maximum crack diameter of 413 μm after indentation experiments and the best bonding strength to the substrate; The average friction coefficients of nanocrystalline diamond (NCD) spherical films, micro/nanocrystalline diamond (M/NCD) spherical films, boron-doped nanocrystalline diamond (BDNCD) spherical films, boron-doped micro/nanocrystalline diamond (BDM/NCD) spherical films, concentric grooves of boron-doped micro/nanocrystalline diamond (CGBDM/NCD) spherical films, and SGBDM/NCD spherical films were reduced in the order of magnitude. Compared with ordinary NCD ball film, SGBDM/NCD ball film has improved wear resistance and increased the removal performance of mold steel by about 23.5 %.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107054"},"PeriodicalIF":4.6000,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Refractory Metals & Hard Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263436825000198","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Since the poor abrasion resistance and adhesion strength of ordinary CVD diamond coatings and the single shape of the substrate have seriously limited the development of diamond surface coating technology in the machining industry, the study of the adhesion and tribological properties of diamond coatings under different shapes of substrates is necessary to solve this problem. In this study, diamond coatings were prepared on the spherical surface of cemented carbide, combining surface micro-texturing, boron doping, and composite coating techniques to investigate diamond coatings' adhesion strength and friction properties. Research Methodology: Diamond spherical films with different micro-texturing and coating types were processed on the spherical surface of WC-Co cemented carbide by laser etching and hot filament chemical vapor deposition (HFCVD). Adhesion and tribological properties of spherical diamond films were studied by indentation and friction experiments. Study results: The optimum boron doping concentration was near 4000 ppm; Concentric square groove boron doped micro/nanodiamond (SGBDM/NCD) spherical films showed the smallest maximum crack diameter of 413 μm after indentation experiments and the best bonding strength to the substrate; The average friction coefficients of nanocrystalline diamond (NCD) spherical films, micro/nanocrystalline diamond (M/NCD) spherical films, boron-doped nanocrystalline diamond (BDNCD) spherical films, boron-doped micro/nanocrystalline diamond (BDM/NCD) spherical films, concentric grooves of boron-doped micro/nanocrystalline diamond (CGBDM/NCD) spherical films, and SGBDM/NCD spherical films were reduced in the order of magnitude. Compared with ordinary NCD ball film, SGBDM/NCD ball film has improved wear resistance and increased the removal performance of mold steel by about 23.5 %.
期刊介绍：
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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