Xu S.,China Solar Power |
Xu S.,Jiuquan New Energy Research Institute |
Chen W.,China Solar Power |
Chen W.,Jiuquan New Energy Research Institute |
And 3 more authors.
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2016
Ultrathin tetrahedral amorphous carbon (ta-C) films were deposited by a home developed filtered cathodic vacuum arc technology. The effect of arc current on the structure and property of the prepared films was investigated. Results show that as the arc current increased from 40 A to 70 A, the deposition rate increased, the sp3 fraction increased first and then decreased; when the arc current was 60 A the maximal density of 3.067 g/cm3 and sp3 fraction of 66% was obtained. The variation of residual compressive stress was similar to sp3 fraction. The minimum residual stress was found about 4 GPa for the arc current 40 A. The surface roughness as a function of arc current decreased gradually first and then increased, and when the arc current was 50 A the minimum surface roughness was 0.195 nm. The deposited ions could fill in the defects of substrate which leads to reducing the surface roughness of ultrathin ta-C films. © All right reserved.
Chen W.-Q.,Jiuquan New Energy Research Institute |
Li Y.-H.,Jiuquan New Energy Research Institute |
Xu S.-P.,Jiuquan New Energy Research Institute |
Lin L.,Jiuquan New Energy Research Institute |
And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015
CaO-Al2O3-SiO2 glass-ceramics were prepared by melting method using gold tailings as the main raw materials, and calcite, borax as auxiliary materials. The phases, thermal properties and microstructures of the as-prepared samples were characterized by XRD, DSC and SEM. The effects of TiO2 and Cr2O3 as crystal nucleus on crystallization of glass-ceramics samples from gold tailings were investigated, respectively. The results show that only the surface of the samples crystallize a lot of crystal, and it crystallized from surface to the inside when using 2% TiO2 as crystal nucleus. The inside of the samples crystallized a little crystal when uisng 4% TiO2 as crystal nucleus. The inside of the samples crystallizes a little reunion crystals when using the 2% Cr2O3 as crystal nucleus. The inside of the samples crystallizes a lot of particle crystals when using 2% TiO2 and 2%Cr2O3 as composite crystal nucleus, and it is greatly improved the overall crystallization ability of the glass-ceramics. The main crystalline phase is diopside (CaMgSi2O3), and the secondary crystalline phase is Anorthite (CaAl2Si2O8). ©, 2015, Rengong Jingti Xuebao/Journal of Synthetic Crystals. All right reserved.