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By using an atomic force microscope, the nanowear tests of Si(100) surface against SiO2 microsphere were performed both in humid air and in water. The experimental results indicated that mechanical interaction could significantly enhance the tribochemical wear of Si/SiO2 pair. There existed a threshold pressure (~1.1GPa) for tribochemical wear under one sliding cycle at 50% RH, which was much less...
Nanowear tests of bare silicon were conducted in water using an atomic force microscope with micro-spherical SiO2 tips. The effect of mechanical interaction, such as contact pressure, sliding velocity, and sliding cycles, on the tribochemical wear of bare silicon was examined. Experimental results indicated that contact pressure significantly influenced the wear of bare silicon. When the maximum contact...
During producing silicon surface and fabricating silicon devices, the machining, cutting and milling from nanoscale to macroscale are accomplished with friction and wear under single- and multiple-asperity contact. In the present study, the scratch tests on silicon surface under single- and multiple-asperity contact were contrastively investigated, and the transition and correlation between different...
The anisotropic removal behavior of single crystal calcium fluoride (CaF2) severely restricts the improvement of surface quality in ultra-precision machining. In this study, the anisotropic mechanical removal of CaF2 material was investigated quantitatively along various crystal orientations on CaF2(111), (110), and (001) surfaces by a conical diamond tip. With the increase of load, the wear of CaF...
During producing silicon surface and fabricating silicon devices, the machining, cutting and milling from nanoscale to macroscale are accomplished with friction and wear under single- and multiple-asperity contact. In the present study, the scratch tests on silicon surface under single- and multiple-asperity contact were contrastively investigated, and the transition and correlation between different...
During machining and polishing of GaAs, surface material removal has become an issue of much concern. By using an atomic force microscope and a spherical SiO2 tip, the nanoscratch tests were conducted on GaAs(100) surface under various sliding velocities. The depth of the scratches increases with the decrease in the sliding velocity. High-resolution transmission electron microscope (HRTEM) detection...
It is of great importance to investigate the occurrence of engraving (also known as “scoring”) of rotating bands during firing to achieve optimal design, manufacturing, use and maintenance of medium and large caliber rifled guns and their corresponding projectiles. In our present study, two short rifled gun barrel sections and projectiles with copper, Al–bronze and nylon rotating bands were prepared...
Due to its excellent mechanical properties and stable chemical behaviours, the diamond-like carbon (DLC) coating has been extensively used as a low-frictional and wear-resistant protective coating in MEMS. However, its efficacy on resisting nanofretting damage of silicon substrate needs to be verified. With an atomic force microscopy, the nanofretting behaviours of ultrathin DLC coating and its Si(100)...
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