Li-rich cathode material of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ was prepared by spray drying method. The structure, morphology and electrochemical properties of the materials were characterized and the effect of sintering temperature on electrochemical properties of the material were investigated. Results show that the cathode material has a good layered structure, the primary particles exhibited rather uniform size distribution with average size of 100 nm. The initial discharge specific capacity of the prepared material can reach 220.2 mAh/g. The coulomb efficiency of the material prepared by sintering at 800oC can reach 72.5%, and the capacity retention rate can reach 96.8% after 18 cycles. Meanwhile, it also showed good electrochemical performance in electrochemical impedance and cyclic voltammetry.

The effect of minor Zr addition on exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet was studied by means of standard exfoliation corrosion immersion tests and electrochemical impedance spectroscope (EIS) technique combined with optical microscopy (OM), electron back scattering diffraction (EBSD) technique and scanning transmission electron microscopy (STEM). The results showed that due to the addition of Zr the exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet is significantly improved, correspondingly, the maximum corrosion depth decreases from 593 μm to 421 μm and the exfoliation corrosion rating changes from EB to EA. The relevant mechanism was discussed based on the difference of grain structure and the changes of the size, spacing and microchemistry of η precipitates at grain boundaries and the width of precipitate free zone.

Creep properties of the pre-deformed F316 stainless steel by 200 MPa at 650℃, 670℃ and 700℃ were investigated. Results show that by a constant tensile stress of 200 MPa, the time to rupture of the pre-deformed F316 stainless steel decreases, while the steady creep rate and the instantaneous creep strain increase with increasing creep temperature. Ductile fracture is the dominant rupture mode for the pre-deformed F316 stainless steel. Creep cavities are mainly located in the triple junctions of grain boundaries, and the average diameter and the area ratio of the voids decrease in the location with the increasing distance to the fracture surface. In the region with the same distance to the fracture surface, the average diameter and area percentage of the voids increase obviously with the increasing creep temperature. The present pre-deformed F316 stainless steel with high density of twins has a better creep resistance than that of non-pre-deformed ones. Time to rupture by 200 MPa at 350℃ was estimated by using the Larson-Miller and θ-projection methods, respectively. The results show that the θ-projection method can give a better correlation. Besides, the long-term creep reliability of the F316 stainless steel served by 200 MP at 350℃ was discussed based on the Larson-Miller and θ-projection methods.

Nanocomposites of GO@HNTs/PP were prepared through melt blending method with polypropylene (PP) as matrix and hybrid nanofillers (GO@HNTs) composed of functionalized graphene oxide (GO) and halloysite nanotubes (HNTs) as filler. The structures and properties of the prepared hybrid nanofillers and PP nanocomposites were systematically investigated. Results show that there is chemical interactions between functionalized GO and HNTs, resulting in formation a "barrier effect" between them and inhibit the aggregation of the two species in the PP matrix. The tensile strength and impact strength of PP nanocomposites with 0.5% GO@HNTs hybrid nano-filler increased by 17.5% and 80.4%, respectively, compared with those of pure PP. Compared with the mechanical properties of composites prepared by adding the same content GO or HNTs alone, GO@HNTs hybrid nano-filler had obvious synergistic strengthening-toughening effect on the PP matrix. GO@HNTs/PP exhibited higher storage modulus, loss modulus and glass transitional temperatures than those of pure PP. The crystallization temperature, melting temperature, crystallinity and thermal decomposition temperature of PP nanocomposites are effectively increased due to the “heterogeneous nucleation effect” and “physical insulation effect” of GO@HNTs.

The composite photocatalyst of Ce-La-Ag-TiO₂/BF (basalt fiber) was prepared by coating the Ce-La-Ag co-doped TiO₂ onto BF via sol-gel method. The effect of the calcination temperature of the composite photocatalyst and the pH value of wastewater on the photocatalytic activity of these photocatalysts was evaluated by examining the degradation rate of ammonia-nitrogen wastewater. The results show that the coupling effect of Ce-La ion and Ag nanoparticles results in the decreases of the band gap of TiO₂ from 3.2 eV to 2.15 eV, with a photocatalytic activity obviously higher than those of the pure TiO₂, Ce-La-TiO₂ and Ag-TiO₂. Moreover, the catalytic activity of Ce-La-Ag-TiO₂ is further improved after being deposited onto BF. When the calcination temperature for the Ce-La-Ag-TiO₂, pH of wastewater and irradiating time of simulate visible light are 600^oC, 10.5 and 360 min, respectively, the resulted degradation rate of ammonia nitrogen wastewater can still reach above 88.2% after repeated use of the composite photocatalyst for five times.

ZnO/ZnS core-shell structured nanorods array has been successfully deposited on ITO substrate via water bath method, and then were characterized by using SEM, XRD and XPS. Results show that the surface of ZnO/ZnS core-shell nanorods array is rough composed of nanorods of 150 nm in diameter, which grown uniformly and densely on the surface of ITO substrate. The self-powered ultraviolet detector was assembled using the ZnO/ZnS core-shell nanorods array and Pt as the counter electrode, then the UV detection performance was investigated. The self-powered ZnO/ZnS heterojunction ultraviolet detector has good reproducibility and stability after multiple cycles of testing. In addition, the device also has a strong photoresponse and high photosensitivity to ultralow light intensity, and displays photoresponse switching behavior as the light intensity increasing. Compared with the self-powered ZnO nanorods detector, the self-powered ZnO/ZnS heterojunction UV detector has faster response with the rise time and decay time of 0.02 s and 0.03 s, respectively.

Manganese dioxide powders were firstly prepared via electric pulse assisted redox method with KMnO₄ and MnSO₄ as raw material, then MnO₂/C composite materials coated with different amounts of carbon were fabricated via liquid phase sintering with glucose as a carbon source. The effect of amount of coated carbon on the morphology, structure and electrochemical properties of the MnO₂/C materials were investigated. Results show that the coated carbon could induce the transformation of crystallographic structure of MnO₂ from γ-type into α-type. Under heating conditions glucose decomposed and coated on the surface of MnO₂ particles, which could inhibit the grain growth and thus refine grains. When the preparation with the process parameters: glucose concentration was 1.5 g/L and the current density was 2 A·g^-1, the prepared MnO₂/C material presented the specific capacitance of MnO₂ of 722.2 F·g^-1, in other words, the carbon coating could increase the specific capacitance by 80%, in comparison with that of the blank ones. Furthermore, after 4000 charge-discharge cycles, the capacitance retention rate could still maintain 74.72%, displayed good electrochemical performance and cycling performance.

The ingots with 120 mm diameter of burn resistant Ti-alloys with nominal composition of Ti-35V-15Cr, Ti-35V-15Cr-0.075C and Ti-35V-15Cr-0.15C were produced by vacuum arc consumable smelting. These ingots were deformed into bars with 25 mm diameter by sheathed extrusion. The microstructures of the ingots and extruded bars of burn resistant Ti-alloys were investigated. The tensile property, thermal stability and creep properties of the extruded bars of burn resistant Ti-alloys were tested under different conditions. The results show that burn resistant Ti-alloys with C addition have better ductility in tensile test due to refined grain size resulted from the sheathed extrusion process. Carbide can act as a stable sink for dissolved oxygen in the matrix, to improve the tensile ductility of the alloy even after hot exposure. In sum, the moderate C addition can improve the creep properties of burn resistant Ti-alloys.

The rapid carburization of Ti6Al4V titanium alloy was carried out by vacuum induction carburizing method. The corrosion behavior of carburized Ti-alloy in HF solution was investigated. Results show that after rapid carburization a layer of TiC and CTi_0.42V_1.58 composite compound was formed on the surface of T-alloy, and in comparison with the blank Ti-alloy, the corrosion rate in 0.2% HF solution decreases from 4.65×10^-10 g·m^-2·h^-1 to 3.3×10^-10 g·m^-2·h^-1 for the carburized Ti-alloy. Correspondingly, the free-corrosion potential increased from -0.94 V to -0.68 V, the corrosion current density decreased from 4.10 mA·cm^-2 to 1.65 mA·cm^-2, the polarization resistance increases from 6.36 Ω·cm² to 15.8 Ω·cm² and R_t increases from 0.2 Ω·cm² to 5.7 Ω·cm². The corrosion product of carburized layer mainly exhibits n-type semiconductor characteristics, and that of the blank Ti-alloy exhibits p-type semiconductor characteristics. The corrosion mechanism of F^- on the carburized layer of Ti6Al4V Ti-alloy is mainly hydrogen evolution corrosion.

Cu-Cr and Cu-Cr-Mg alloys were prepared by melting and casting process, then the effect of Mg addition on hardness, electrical properties and softening resistance of the alloys was assessed. The results show that after aging treatment, the hardness and softening temperature of the Cu-Cr-Mg alloy are higher than that of the Cu-Cr binary alloy, while the high electrical conductivity is maintained. The main strengthening mechanism of these two alloys is aging precipitation strengthening. The addition of Mg inhibits the growth and structural transformation of the nano-precipitates. The strengthening phase of the peak-aged Cu-Cr-Mg alloy still maintains a coherent interface with the matrix. The precipitate with the similar structure as Heulser phase is observed in the over-aging alloy. After post heat treatment of the peak-aged alloys, the size of the strengthening phase of Cu-Cr-Mg alloy is significantly smaller than that of the Cu-Cr alloy. Mg and Cr coexist in the precipitate at the early stage of aging, while in the later stage of aging, only Cr exists inside the precipitate. The theoretical estimation results show that Mg can significantly reduce the interfacial energy between Cu (fcc) and Cr (bcc), leading to segregation of Mg at the interface matrix/precipitate. This may be the main reason why Mg can refine the precipitates and improve the performance of the Cu-Cr alloy.