A hydrodynamic approach is used to investigate a three-component magnetized plasma sheath which consists of electrons and two species of positive ions. Assuming a phase space of one-dimensional spatial coordinate syst...A hydrodynamic approach is used to investigate a three-component magnetized plasma sheath which consists of electrons and two species of positive ions. Assuming a phase space of one-dimensional spatial coordinate system and three-dimensional velocity coordinate system, the effect of different concentrations of positive ion species on some characteristics of the plasma sheath such as the velocity and density distribution of positive ion species and the electrostatic potential of this region is investigated. The calculated results show that the increase in the density ratio of positive ion species causes a decrease in both the ion velocities and the electrostatic potential of the sheath region. Also, it is shown that in the sheath region of a magnetized plasma consisting of only one positive ion species the bumps of the net density of charged particles disappears much faster. In addition, three-dimensional velocity of each positive ion species in the sheath region is plotted for different concentrations of positive ion species.展开更多
为了探究镍钴(Ni-Co)合金镀层在不同工况条件下的摩擦磨损情况,采用电沉积技术制备了Ni-Co合金镀层,分别利用显微硬度计和X射线衍射仪(X-Ray Diffractometer,XRD)表征了Ni-Co合金镀层的显微硬度和相结构,利用摩擦磨损试验机、扫描电子...为了探究镍钴(Ni-Co)合金镀层在不同工况条件下的摩擦磨损情况,采用电沉积技术制备了Ni-Co合金镀层,分别利用显微硬度计和X射线衍射仪(X-Ray Diffractometer,XRD)表征了Ni-Co合金镀层的显微硬度和相结构,利用摩擦磨损试验机、扫描电子显微镜(Scanning Electron Microscope,SEM)、能谱仪(Energy Dispersive Spectrometer,EDS)和三维形貌仪研究了镀层在不同载荷、频率与摩擦副下的摩擦学性能。结果表明:镀层的显微硬度为428 HV;镀层为面心立方结构;镀层的磨损体积随载荷和频率的增大而增大;摩擦副为GCr15钢球时,主要为粘着磨损;摩擦副为Si3N4陶瓷球时,主要为磨粒磨损,且与摩擦副为GCr15钢球时相比,镀层磨损体积较小,摩擦因数(Coefficient Of Friction,COF)较低。展开更多
基金supported by the Research Council of the Shahaid Beheshti University,G.C.of Iran
文摘A hydrodynamic approach is used to investigate a three-component magnetized plasma sheath which consists of electrons and two species of positive ions. Assuming a phase space of one-dimensional spatial coordinate system and three-dimensional velocity coordinate system, the effect of different concentrations of positive ion species on some characteristics of the plasma sheath such as the velocity and density distribution of positive ion species and the electrostatic potential of this region is investigated. The calculated results show that the increase in the density ratio of positive ion species causes a decrease in both the ion velocities and the electrostatic potential of the sheath region. Also, it is shown that in the sheath region of a magnetized plasma consisting of only one positive ion species the bumps of the net density of charged particles disappears much faster. In addition, three-dimensional velocity of each positive ion species in the sheath region is plotted for different concentrations of positive ion species.
文摘为了探究镍钴(Ni-Co)合金镀层在不同工况条件下的摩擦磨损情况,采用电沉积技术制备了Ni-Co合金镀层,分别利用显微硬度计和X射线衍射仪(X-Ray Diffractometer,XRD)表征了Ni-Co合金镀层的显微硬度和相结构,利用摩擦磨损试验机、扫描电子显微镜(Scanning Electron Microscope,SEM)、能谱仪(Energy Dispersive Spectrometer,EDS)和三维形貌仪研究了镀层在不同载荷、频率与摩擦副下的摩擦学性能。结果表明:镀层的显微硬度为428 HV;镀层为面心立方结构;镀层的磨损体积随载荷和频率的增大而增大;摩擦副为GCr15钢球时,主要为粘着磨损;摩擦副为Si3N4陶瓷球时,主要为磨粒磨损,且与摩擦副为GCr15钢球时相比,镀层磨损体积较小,摩擦因数(Coefficient Of Friction,COF)较低。
