Nanocomposite Cr C/hydrogenated amorphous carbon(nc-CrC/a-C:H) coatings were deposited by a hybrid beams system comprised of a hollow cathode ion source and a cathodic arc ion-plating unit with varying H_2 flow rates....Nanocomposite Cr C/hydrogenated amorphous carbon(nc-CrC/a-C:H) coatings were deposited by a hybrid beams system comprised of a hollow cathode ion source and a cathodic arc ion-plating unit with varying H_2 flow rates. The influences of H_2 flow rates on the morphologies, microstructures, and properties of the coatings were systematically studied. The morphologies and microstructures of the coatings were characterized by SEM, AFM, XPS, Raman spectroscopy, GIXRD, and HRTEM. The mechanical and tribological properties were measured by a nano-indenter, scratch tester, and ball-ondisk tribometer. The wear tracks were evaluated using 3D profilometer, optical microscope, and EDS analysis. It has been found that a moderate H_2 flow rate can effectively smooth the surface, enlarge the fraction of a sp^3 bond, and improve the properties. The coating exhibits the highest hardness and elastic modulus at the H_2 flow rate of 40 sccm. A superior combination of adhesion strength,friction coefficient, and wear resistance can be achieved at the H_2 flow rate of 80 sccm.展开更多
为比较磁控溅射制备的a-C:BCx和a-C:Cr这2种涂层的摩擦学性能,并研究2种涂层结构对摩擦学性能的影响,采用非平衡磁控溅射技术在38Cr Mo Al齿轮钢表面制备了a-C:BCx和a-C:Cr涂层,通过扫描电子显微镜与纳米压痕仪对2种涂层显微结构与力学...为比较磁控溅射制备的a-C:BCx和a-C:Cr这2种涂层的摩擦学性能,并研究2种涂层结构对摩擦学性能的影响,采用非平衡磁控溅射技术在38Cr Mo Al齿轮钢表面制备了a-C:BCx和a-C:Cr涂层,通过扫描电子显微镜与纳米压痕仪对2种涂层显微结构与力学性能进行了表征,并利用摩擦磨损试验机对涂层在干摩擦和油润滑(4109润滑油)条件下的摩擦学性能进行了评价。结果表明:a-C:BCx涂层的显微硬度和弹性模量均高于a-C:Cr涂层,a-C:BCx涂层在常温干摩擦、常温油润滑和高温油润滑下的摩擦学性能均优于a-C:Cr涂层,这主要归因于a-C:BCx涂层具有较高的显微硬度以及在对偶球上形成稳定的转移膜。展开更多
Hydrogenated amorphous carbon coatings, deposited by low pressure plasma to minimize the wear of C100 steel components, were optimized and characterized. In order to ensure good adhesion of the films to the steel surf...Hydrogenated amorphous carbon coatings, deposited by low pressure plasma to minimize the wear of C100 steel components, were optimized and characterized. In order to ensure good adhesion of the films to the steel surface, a thin Ti interlayer was deposited, by magnetron sputtering, before the plasma deposition. The chemical characterization of the deposits was performed by means of RAMAN, XPS, RBS and ERDA analysis, while nanoindentation, nanoscratch and nanowear tests allowed to estimating the tribomechanical properties of the deposits, with the aim of evaluating their scuff-resistance. It was found that the optimized plasma deposited hydrogenated amorphous carbon coatings were well adherent to C100 steel and increased more than 70% its surface hardness.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11275141 and 11175133)the International Cooperation Program of the Ministry of Science and Technology of China(No.2015DFR00720)+2 种基金the Center for Electron Microscopy of Wuhan Universitythe Center of Nanosci. and Nanotech,Research of Wuhan Universitythe Analysis and Test Center of Wuhan University
文摘Nanocomposite Cr C/hydrogenated amorphous carbon(nc-CrC/a-C:H) coatings were deposited by a hybrid beams system comprised of a hollow cathode ion source and a cathodic arc ion-plating unit with varying H_2 flow rates. The influences of H_2 flow rates on the morphologies, microstructures, and properties of the coatings were systematically studied. The morphologies and microstructures of the coatings were characterized by SEM, AFM, XPS, Raman spectroscopy, GIXRD, and HRTEM. The mechanical and tribological properties were measured by a nano-indenter, scratch tester, and ball-ondisk tribometer. The wear tracks were evaluated using 3D profilometer, optical microscope, and EDS analysis. It has been found that a moderate H_2 flow rate can effectively smooth the surface, enlarge the fraction of a sp^3 bond, and improve the properties. The coating exhibits the highest hardness and elastic modulus at the H_2 flow rate of 40 sccm. A superior combination of adhesion strength,friction coefficient, and wear resistance can be achieved at the H_2 flow rate of 80 sccm.
文摘为比较磁控溅射制备的a-C:BCx和a-C:Cr这2种涂层的摩擦学性能,并研究2种涂层结构对摩擦学性能的影响,采用非平衡磁控溅射技术在38Cr Mo Al齿轮钢表面制备了a-C:BCx和a-C:Cr涂层,通过扫描电子显微镜与纳米压痕仪对2种涂层显微结构与力学性能进行了表征,并利用摩擦磨损试验机对涂层在干摩擦和油润滑(4109润滑油)条件下的摩擦学性能进行了评价。结果表明:a-C:BCx涂层的显微硬度和弹性模量均高于a-C:Cr涂层,a-C:BCx涂层在常温干摩擦、常温油润滑和高温油润滑下的摩擦学性能均优于a-C:Cr涂层,这主要归因于a-C:BCx涂层具有较高的显微硬度以及在对偶球上形成稳定的转移膜。
文摘Hydrogenated amorphous carbon coatings, deposited by low pressure plasma to minimize the wear of C100 steel components, were optimized and characterized. In order to ensure good adhesion of the films to the steel surface, a thin Ti interlayer was deposited, by magnetron sputtering, before the plasma deposition. The chemical characterization of the deposits was performed by means of RAMAN, XPS, RBS and ERDA analysis, while nanoindentation, nanoscratch and nanowear tests allowed to estimating the tribomechanical properties of the deposits, with the aim of evaluating their scuff-resistance. It was found that the optimized plasma deposited hydrogenated amorphous carbon coatings were well adherent to C100 steel and increased more than 70% its surface hardness.
