The Si3N4 microcrystals with a hollow sphere structure were prepared by using the simple heat treatment of the Si3N4 flakes, which were prepared by using the cathode arc plasma. The products were characterized by XRD,...The Si3N4 microcrystals with a hollow sphere structure were prepared by using the simple heat treatment of the Si3N4 flakes, which were prepared by using the cathode arc plasma. The products were characterized by XRD, SEM and TEM. The photoluminescence (PL) spectrum of the Si3N4 nano-microsphere was studied. The obtained Si3N4 microcrystals, which show a hollow sphere structure, are up to several nanometers in diameter. During the process, the heat treatment and Ni catalyst play a key role in the forming structure and morphology. This result provides a possibility for mass producing Si3N4 microcrystals.展开更多
Friction behaviors of hydrogenated diamond-like carbon (H-DLC) films are investigated on a ball-on-disk type tribometer in dry N2 and dry vacuum.The result shows that the friction behaviors of the H-DLC films are very...Friction behaviors of hydrogenated diamond-like carbon (H-DLC) films are investigated on a ball-on-disk type tribometer in dry N2 and dry vacuum.The result shows that the friction behaviors of the H-DLC films are very sensitive to the testing environment,the H-DLC films exhibit a very low friction coefficient of 0.016 in dry N2,and similarly in an inert gas the friction coefficient increases to about 0.063 in dry vacuum.Combining the testing conditions,friction results,SEM and XPS investigation,it is concluded that the friction behaviors of the hydrogenated DLC films are associated with surface hydrogen of the H-DLC films and are dictated by whether or not hydrogen bonds are formed between the transfer films/H-DLC films at the sliding interface.A hydrogen-induced hydrogen bond model is proposed to interpret the friction behaviors of hydrogenated DLC films in different environments.展开更多
基金Project(60376039) supported by the National Natural Science Foundation of China
文摘The Si3N4 microcrystals with a hollow sphere structure were prepared by using the simple heat treatment of the Si3N4 flakes, which were prepared by using the cathode arc plasma. The products were characterized by XRD, SEM and TEM. The photoluminescence (PL) spectrum of the Si3N4 nano-microsphere was studied. The obtained Si3N4 microcrystals, which show a hollow sphere structure, are up to several nanometers in diameter. During the process, the heat treatment and Ni catalyst play a key role in the forming structure and morphology. This result provides a possibility for mass producing Si3N4 microcrystals.
基金Supported by the National Natural Science Foundation of China under Grant Nos 51005110 and 11104126China Postdoctoral Science Foundation under Grant No 20090450846the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20096204120002。
文摘Friction behaviors of hydrogenated diamond-like carbon (H-DLC) films are investigated on a ball-on-disk type tribometer in dry N2 and dry vacuum.The result shows that the friction behaviors of the H-DLC films are very sensitive to the testing environment,the H-DLC films exhibit a very low friction coefficient of 0.016 in dry N2,and similarly in an inert gas the friction coefficient increases to about 0.063 in dry vacuum.Combining the testing conditions,friction results,SEM and XPS investigation,it is concluded that the friction behaviors of the hydrogenated DLC films are associated with surface hydrogen of the H-DLC films and are dictated by whether or not hydrogen bonds are formed between the transfer films/H-DLC films at the sliding interface.A hydrogen-induced hydrogen bond model is proposed to interpret the friction behaviors of hydrogenated DLC films in different environments.
