A superhydrophobic phosphate-cerium salt composite coating was prepared on hot-dip galvanizing carbon steel via a two-step chemical conversion process, namely first traditional phosphating and then dipping in solution of cerium nitrate and stearic acid. The prepared coating was characterized in terms of surface morphology, chemical composition and structure by means of field emission scanning electron microscopy (FE-SEM), energy spectrum analyzer (EDS), fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The hydrophobicity and corrosion performance of the prepared coating was assessed by means of contact angle- and sliding angle- measurement, as well as electrochemical impedance (EIS) and Tafel polarization curve measurement. Results show that the superhydrophobic coating can effectively reduce the corrosion through the interfacial air film. The contact angle of the coating can reach up to 162°. The coating, prepared by dipping in cerium salt solution for about 300 s, presents an electrochemical impedance two orders of magnitude superior to that of pure Zn, indicating a good corrosion resistance.

The foam structured catalysts of Ni/Al₂O₃-SiC were prepared via conventional impregnation (IM) and deposition-precipitation (DP) methods. These catalysts were characterized by means of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), N₂ absorption-desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and H₂ temperature-programmed reduction (H₂-TPR). The effect of preparation methods on the distribution, particle size and valence state of the active component Ni, as well as the interaction between Ni and the supporter was investigated. Furthermore, the catalytic performance of the catalysts prepared by different methods was evaluated for the liquid-phase hydrogenation of benzaldehyde. Results show that the Ni enrichment occurred on the coating surface of three catalysts prepared via impregnating and then dried in air at 40℃ and 160℃, as well as subjected to vacuum freeze-drying, respectively. The foam catalyst dried at 160℃ showed the most serious enrichment of Ni on the coating surface. Compared with the three impregnated foam catalysts, the catalyst prepared by DP method has a uniform Ni distribution and smaller Ni particles size, leading to its higher catalytic performance for hydrogenation of benzaldehyde.

One novel oligomeric BMI monomer of n ≈1 containing fluorene cardo and cyano groups (PFCBMI) was synthesized with 9,9′-bis[4-(4-maleimidophenoxy)phenyl] fluorine and dichlorobenzonitrile as raw materials. The chemical structure as well as the curing behavior and the thermal stability of the BMIs were characterized by means of 1H NMR spectroscopy and Fourier transform infrared spectroscopy (FTIR) as well as dynamic differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). In addition, the copolymerizations of PFCBMI/BDM resins were investigated. Results show that the characteristic parameters of DSC curves for PFCBMI/BDM resin system increased with the increase of PFCBMI; The increase of PFCBMI leads to the decrease of the crosslink density and thus the decrease of the characteristic parameters for PFCBMI/BDM resins. Furthermore, the PFCBMI/BDM composites present excellent heat resistance with the storage modulus about 10 GPa and the glass transition temperature above 470°C.

12CrNi2 alloy steel has been prepared by means of laser additive manufacturing (LAM) using a commercial alloy steel powder. The results show that the LAMed alloy steel contains a large number of pores intrinsically associated with the reaction of O and C, which form gases in molten pool of the laser melting alloy steel powder. The pore formation can be highly suppressed by adding into the steel powder with small amounts of Cr, because it preferentially reacts with O to form Cr₂O₃ and consequently prevents the gases formation in the molten pool. The Cr₂O₃ formation also refines the ferrite and the austenite phases of the LAMed alloy steel and increases its hardness.

Effects of grain size on the fatigue properties of Ni-base superalloy K492 at 700℃ and 800℃ with various grain sizes were investigated. The fatigue fracture mechanism is analyzed by scanning electron microscopy and transmission electron microscopy. The results show that grain refinement improves the fatigue properties of K492 at 700℃ and 800℃. For high-cycle fatigue (HCF) at 700℃, fatigue cracks occur at the metallurgical defect or at a certain crystal plane. The distribution of dislocation configuration is band-like and the morphology of γ' phase does not change. The dislocations pass through the γ' phase by shearing or Orowan loops passing. For HCF at 800℃ the fatigue cracks generated at the defects. In some regions the morphology of dislocation configuration was similar to that at 700℃ HCF and the morphology of γ' phase does not change; In the other region, the γ' phase rafts and dislocations distribute in the matrix channel, and the γ' phase loses the pinning effect of dislocations. For low-cycle fatigue (LCF) at 700℃, fatigue cracks mainly originate from the surface. For LCF at 800℃, fatigue cracks mainly occur at the secondary surface or at a certain crystal plane.

Cr, Fe, Ti and Sn were added to brass matrix as trace alloying elements. The brass alloys powder prepared by water atomization process were premixed with graphite particles and consolidated at appropriate temperature. The sintered billet was hot extruded to increase the density and prepare extrusion rod for tensile test. The effects of graphite particles and alloying elements on the machinability, microstructural and mechanical properties of Cu40Zn brass were investigated in detail. It was found that the super-saturated solid solution of Cr, Fe and Ti creates a high precipitation reaction chemical potential in water atomized brass powder, which precipitated in form of nano/micro scale particles in the subsequent hot working showing superior strengthening effect. Graphite particles with appreciate content can improve machinability effectively without deteriorating the mechanical properties.

The effect of Cu-content on microstructure and fracture behavior of Al-Cu-Mn alloy was investigated by tensile test, optical microscope (OM) and scanning electron microscope (SEM). The results show that with the decrease of Cu-content from 6.51% to 5.41% (in mass fraction) the quantity and size of the coarse Al₂Cu phase in the alloy is reduced, the elongation of the alloy increases and thus the anisotropy of the alloy is decreased. The main mechanism is that for the alloy with relatively high Cu-content, the formed micron Al₂Cu phase causes stress concentration, which induces preferentially breakage of Al₂Cu phase and then the formed cracks are interconnected. However, for the alloy with lower Cu-content, the cracks do not expand and connect with each other after the breakage of Al₂Cu phase, while fracture may expand along grain boundaries. The difference in orientation distribution of micron phases of Al₂Cu in the matrix of alloy may be the main reason for the anisotropy of mechanical properties.

The transparent conductive films aluminum doped zinc oxide (AZO) was prepared on a glass substrate by RF magnetron sputtering from powder targets. AZO films were annealed by controlling the temperature and oxygen partial pressure. The morphology and microstructure,as well as the optical and electrical properties of the as-deposited and annealed films were characterized by Scanning electron microscope(SEM),X-ray diffraction (XRD),UV-visible Spectrophotometer and the Hall-effect measure-ment．The results show that annealed AZO film keep a (002) preferred orientation hexagonal wurtzite structure, and the smooth and compact surface. With the decrease of annealing oxygen partial pressure the optical band gap becomes narrow, and the transmittance of AZO films decreases slightly but still above 80%. As the annealing oxygen partial pressure decreases, the electrical conductivity of AZO films is significantly improved with evident increase of charge carrier concentration. The resistivity is reduced to 2.1×10^-3 Ω·cm.

Spherical porous VN materials were synthesized by a facile NH₃ reduction method with spherical V₂O₅ as the precursor,while the spherical V₂O₅ was prepared via soft template method and spray drying technology. The structure, morphology and electrochemical performance of the prepared VN were characterized by means of XRD,SEM,TEM,and N₂ adsorption-desorption analysis, as well as cyclic voltammetry and galvanostatic charge-discharge measurements. The results show that the synthesized spherical porous VN powder presents cubic crystallographic structure with abundant mesopores,and its specific surface area is 120 m²·g^-1. In addition, the spherical porous VN powder presents characteristics both in electrical double-layer capacitance and redox pseudo-capacitance . Its specific capacitance is 513 F·g^-1 by current density of 100 mA·g^-1,and which remained 76.8% even after 5000 cycles. For power density is 590 W·kg^-1,its energy density is 65.0 W·h·kg^-1. When the power density was 3260 W·kg^-1,the energy density was as high as 24.17 W·h·kg^-1.

A transparent and fire-retardant nanocomposite film of NFC/nanoclay was prepared in order to realize the compatibility between high transparency and fire retardance. Firstly, the clay was exfoliated from lamellar structure into monolayer structure to enhance its uniformity in thickness; secondly, during the fabrication of nanocomposite film, the stability of monolayer clay suspension is enhanced by taking advantage of the excellent steric hindrance of NFC in water. Consequently, the individual monolayer nanoclay is self-assembled into nanocomposite film with well-ordered mortar-and-brick structure, which facilitates the transmission of light through the hybrid film. The structure, thermal stability, and flammability of the nanocomposite film were characterized by means of SEM, XRD, and TGA. The results show that as the mass ratio of monolayer clay to NFC is 1:1, the nanocomposite film exhibits ca 90% transparency and a limiting oxygen index over 60%.