Applied Mechanics and Materials Vols. 556-562

Abstract: Thin film solar cells (TFSC) are the most potential for development of new and renewable clean energy. The large-scale production and application of TFSC can ease the energy crisis and protect the environment for human. However, buffer layer is a critical layer, which determines the performance of TFSC. This paper reviews the preparation, mechanisms, deposition systems, and development of ZnS thin-film buffer layers and points out that CBD-ZnS thin film is the best buffer layer material taking place of CdS.

Abstract: In this work, the crosslink density of uncured natural rubber with different initial moisture contents, 3.80%, 10.05%, 19.76%, 23.68%, respectively, dried by microwave at frequency of 2450MHz was studied using nuclear magnetic resonance spectrometer. Seen from the results, the effect of initial moisture content of wet natural rubber on crosslink density and processability were obvious. With the increment of initial moisture content of wet natural rubber, the crosslink density of natural rubber after microwave dried with the frequency of 2450MHz decreased gradually. The crosslink density and A(Mc) of natural with the lower initial moisture content was bigger compared with natural rubber with the higher initial moisture content.

Abstract: Geometric structure and electronic structures of Zn_1-xMg_xO alloy under different Mg doped concentrations have been investigated by performing the first-principle calculations based on density functional theory under the generalized gradient approximation (GGA). The calculated results show that there is substantial change in electronic structure of Mg doped Mg_xZn_1-xO alloy, with the constant increase of Mg content, cell parameter a shall be on the gradual increase, with c on gradual decrease and band gap width of Mg_xZn_1-xO alloy on the increase. The research findings show that the position of conduction band bottom is dependent on Mg 2p and Zn 4s. Mg doping results in drift of Mg 2p and Zn 4s toward high energy region, being the root cause for the increase in band gap width,the research results in the paper are in accordance with other experimental results. The above results provide theoretical guidance to the preparation of Zn_1-xMg_xO alloy in experiment.

Abstract: Silicon steel magnesium oxide is a coating material used for preparing oriented silicon steel. In this paper, The preparation methods of silicon steel magnesium oxide and research progress of high quality silicon steel magnesium oxide preparation technology were introduced. The use of abundant brine resources in the preparation of silicon steel magnesium oxide was prospected.

Abstract: ZnS films have been deposited on glass by chemical bath deposition (CBD). The optical and structural properties were analyzed by UV-VIS spectrophotometer and X-ray diffraction (XRD). The results showed that different sides of glass substrate have different thicknesses of the ZnS thin films, which can affect the optical and structural properties of ZnS thin films. The ZnS films of the side of glass substrates back to the solution center are thicker than that of the other side, and the ZnS films from ZnSO₄ are thicker than that from Zn (NO₃)₂. The transmittances lower with the thicknesses of ZnS films increasing. The band gaps exhibit blue response with the thicknesses of ZnS films increasing. From the sides of glass substrates back to the solution center, the (111) reflection of the sphalerite structure can be observed at about 2θ=29.1°, while from the other side toward the solution center showed no significant peak.

Abstract: With the laser cladding technology, 70%Ni60A+30%WC cladding layer was cladded on the surface of Q345 steel. And the phase, microstructure and wear resistance of cladding layer were analyzed. Experiments show that the Ni-based WC alloy laser cladding treatment on Q345 steel surface have a great upgrade on grain refinement, surface hardness and wear-resistance of Q345 steel surface.

Abstract: For the characteristic of the high oxidation ratio and the high intergrowth ratio,the copper ore belongs to a kind of refractory ore.It could not get qualified concentrate and high recovery with the traditional flowsheet and general reagent system.In the case of stable grade of copper concentrate,the recovery of copper using composite reagent system could have a reasonably improve,which could reach to 84.49% at the copper concentrate grade of Cu 20.91%.

Abstract: By comparing a variety of programs, for the feature of a certain Cu-Pb-Zn poly-metallic sulfide ore in Yunnan, using the processes of copper and lead priority floating, combined depressants of sodium silicate + sodium sulfite + carboxymethylcellulose in copper flotation, the tailings of bulk flotation for copper and lead after activated flotation of zinc mineral by copper sulfate, the successful implementation of effective separation of copper and lead and gained a better indicator of dressing.

Abstract: The experimental ore belongs to a kind of typical high sulfur ore,which makes it to be a refractory ore.The copper in the ore has a relative high grade which comprehensively reaches 3.78% ,with the chalcopyrite occurs the main form.After a serious of condition tests,a final flowsheet with once roughing,twice cleaning and twice scavenger is determined.Through a closed-circuit,it could obtain copper concentrate with grade of 20.91% and recovery of 91.61%

Abstract: Because of the low ilmenite grade and fine dissemination size, a lot of low-magnetic flaky phlogopite in the run-of-mine ore and it can not effectively remove the phlogopite by the high gradient magnetic separation, so it is very difficult to sorting. We decided take the process of low intensity magnetic separation – high gradient magnetic separation and gravity separation discarding tailing - high gradient magnetic separation and shaking concentrate. Then we obtained satisfaction index - the grade and the recovery of TiO₂ were 43.32% and 74.41% in the ilmenite concentrates, the grade and recovery of Fe were 66.83% and 56.77% in the iron concentrates. It provides a feasible way for such ilmenite separation.