The influence of Si in solution, silicide and α2 phase on the high temperature creep and creep rupture properties of Ti–60 titanium alloy was investigated. The results show that silicide precipitated between α plates increases the creep resistance at 600 ^oC, which becomes more pronounced when α2 phase precipitated in the matrix. However, the effect of silicide on the creep rupture property was negative when silicides exist in large size and amount. Precipitation of α2 phase was beneficial both to high temperature creep and creep rupture properties. Increase of silicide in solution by way of lowering the silicide precipitation was more beneficial to creep rupture properties with higher applied stress than to creep properties with lower applied stress. The underlying  mechanism under creep test condition can be rationalized by the different deformation mechanism under different applied stress.

Two kinds of self-assembled monolayers (SAMs) with same length of molecule chain and different functional groups are prepared on titanium metal film by self-assembled method and radiated by ultraviolet radiation treatment for different times. The characterization and friction properties measurement of titanium metal film and SAMs are explored. The effects of ultraviolet radiation, functional groups, sliding velocity and load on friction properties of SAMs are investigated. The results show that compact SAMs can be prepared by hydroxylation in titanium film surface with ultraviolet radiation, hydrolysis and condensation of self-assembled molecules. Two kinds of short chain SAMs can reduce friction and the friction properties of APS SAMs is better than MPS SAMs, The friction force of SAMs with 5 min ultraviolet radiation is the lowest because the organic contamination at surface is vaporized which results in decrease of the adhesive force to tip and deformation of tip reduced. Lubrication effects of SAMs with 15 min ultraviolet radiation are weakened because of the destroy of compact net structure of SAMs. The friction forces increase slightly with the increasing of sliding velocity and decrease with the increasing of load, but change not significantly.

The self-assembly growth of Au nano-particles on atomic-layer-deposited (ALD) Al₂O₃ thin film has been achieved. And the self-assembly process and the thermal stability have been investigated.The results show that the ALD Al₂O₃ film is inclined to adsorb (3-Aminopropyl)-trimethoxysilane (APTMS), which is in favor of self-assembly growth of Au nano-particles. The resulting Au nano-particles are mainly in the range of 5–8 nm with a density of nearly 4×10¹¹cm⁻². The annealing at 300   in N2 leads to an increase in the dimension of Au nano-particles, however, the good adsorption of APTMS and the chemical compositions of Au nano-particles are maintained. When the annealing temperature elevates to 450  , Au nano-particles exhibit severe agglomeration together with extreme nonuniformilty.

A stress-strain relation of the thermoviscoelastic matrix composites with pre-strained NiTi fiber is proposed in the field of variable temperature based on the thermoviscoelasticity theory and the rule of mixtures, and in view of the process of martensite reverse transformation. During the reverse transformation and the thermoviscoelastic state of matrix, due to matrix relaxation modulus decreasing,the results show that upon the step constant stress, the compression strain of the composites increases rapidly, and the recovery stress of the NiTi fiber increases then decreases; Under the step constant strain, the increase of the composites stress become slow then fast, till steady. The behaviors of the composites, and the NiTi fiber actuation performance are influenced by higher temperature as well as the material parameters.

Two types of core-shell structured cathode materials-pyrolytic carbon(PyC)/LiFePO₄ and carbon nanofiber(CNF)/LiFePO₄ were synthesized by fluidized bed chemical vapor deposition method and their electrochemical properties were explored. The PyC or CNF coating can effectively reduce the resistivity of LiFePO₄, and greatly improved its charge-discharge capacity and cyclability. Compared with PyC, the one dimensional structure and excellent mechanical performance of CNF make it more suitable as the conductive additive of LiFePO₄.

Equal high porosity shaped Al alloy foam were fabricated by metallurgy bonding of Al alloy foam flans in the shaped mould with enough equal TiH₂ powder by two--step foaming (TSF) method. The microstructure of bonding joint between Al alloy foam was observed by using stereo--microscope and X--CT, and the tensile strength of the bonding joint was tested. The results show that the optimized temperature and foaming time for appropriate bonding are 700--900℃ and 250--800 s, respectively. The interface mechanical joining and the interface diffusion dominate the bonding mechanisms of Al alloy foam by TSF method. The metallurgy bonding tensile strength of shaped Al alloy foam increases with the decrease of the porosity of Al alloy foam, and the bonding strength is close to the Al alloy foam matrix when the porosity rises to 74.9%.

Acoustic absorption of single–layer porous electrolytic iron–nickel panels with different parameters was measured and analyzed, as well as double–layer porous electrolytic iron–nickel panels. Porous electrolytic iron–nickel panel was idealized as micro–perforated panel with ultra–minute perforation to calculate sound absorption applying statistical average hole diameter and hole space by Maah‘s theory. Porous electrolytic iron–nickel panel with back cavity exhibited resonant absorption character and performed good sound absorption. For single–layer porous electrolytic iron–nickel panel with cavity, calculations by Maah's theory were in concord with measurement results. For double–layer structure, calculation presented frequency character of absorption and maximum absorption coefficient similar to measurements, but there existed frequency shift of maximum absorption between calculation and measurement results.

The polymer ceramic precursors with varied structures were made from UV cure thiol/vinyl silizane copolymer. Silicon nitride ceramic was obtained by pyrolyzing at high temperature. The effects of functionality of thiol, size of thiol molecular, thiol to vinyl ratio and the amount of inert filler on crystallinity and grain size were investigated and characterized by XRD, FESEM and energy spectrometer. It is found that the increase of functionality of thiol declines the crystallinity of the ceramic, but makes the grain size increase, whereas, the high of thiol stoichiometric molecular weight has the reverse effect. The increase of thiol to vinyl ratio enhances the crystallinity of the ceramic. There is a peak of the grain size when the vinyl to thiol ratio is 1:0.5. The incorporation of inert filler(β-Si3N4) can obviously depress the shrinkage of the size of ceramic.

Microstructure and properties of plasma immersion ion implantation and deposition (PIII&D) diamond-like carbon (DLC) films on bearing steel substrate were investigated. PIII&D DLC consists of a mixture of amorphous and crystalline phases, with a variable ratio of sp²/sp³ carbon bonds, and the sp³ bonds content more than 10%. The DLC film has extremely smooth area, good adhesion, high uniformity and efficiency of space filling over large areas. The nanohardness (H) and the elastic modulus (E) of DLC films measurement indicates that the maximum H(E) value is 40 GPa (430 GPa), increases by 263.6% (95.5%). The friction and wear behaviors and rolling contact fatigue (RCF) life of these samples have also been investigated by ball-on-disc and three-ball-rod fatigue testers. Results show that the friction coefficient decrease from 0.87 to 0.2; the L₁₀ L₅₀ L_a and mean life L of treated sample in 90% confidence level increases by 10.1, 4.2, 3.5 and 3.4 times, respectively. The RCF life scatter extent of treated samples is improved significantly.

The influence of cooling rates on the morphology of pearlite in Fe--0.12%C alloy under high magnetic field (12T) was investigated. It is shown that the long axes of pearlite colonies tend to align and elongate along the magnetic field direction, and such tendencies become weak as the cooling rates increases. The pearlite percentage in the sample placed with its plate plane parallel to the magnetic field direction reduces as compared with the one placed with its plate plane perpendicular to the field direction. Meanwhile, the tendencies of elongation of pearlite colonies and alignment of their long axes along the magnetic field direction decreases. Finally, the mechanism of magnetic field on the morphology of pearlite evolution is discussed.

By the numerical simulation of spherical indenter, it was observed that for the material with strain hardening exponent n >0.23, sinking-in will happen for all values of yield strain σy/E, but when n <0.23, both pile-up and sinking-in depend on the changing of σy/E. For the material with σ_y/E >0.02, sinking-in was observed for all values of n during indenting, but when σ_y/E <0.02, both pile-up and sinkin depend on the changing of n. For the ratio of residual indentation depth and maximum indentation depth (h_f /h_max)<0.76, the material shows sinking-in behavior, and the higher strain hardening exponent is, the greater sinking-in is. For h_f /h_max>0.76, pile-up changes to sinking-in when n <0.23 and totally sinking-in when n >0.23. The relation between the feature of pile-up or sinking-in c2 and contact area was obtained, and the effect of c2 on error of hardness was analyzed.

A novel method for producing carbon nanotubes (CNTs) reinforced alumina ceramics was reported. The reaction heat generated by combustion was utilized as a high temperature source, and great mechanical pressure was applied when the combustion reaction was finished. When adding 1% CNTs, the fracture toughness of the composites increased about 50% compared with the pure alumina ceramics prepared in the same conditions. The results indicate that the sintering method is beneficial to protecting the CNTs from destruction. The toughening mechanisms are mainly CNTs pulled-out and CNTs bridging.

Perovskite type sulfuric acid-modified titanium-bearing blast furnace slag (STBBFS) photocatalysts were prepared by the high energy ball milling method at different temperatures and characterized. Its photocatalytic activity was checked through the photocatalytic reduction of Cr(VI) as a model compound under UV-Vis light irradiation. The results showed that CaTiO₃/TiO₂ mixed crystal structure was found in STBBFS photocatalysts; the particle size increased with increasing calcinations temperature; the photocatalytic activities calcined at 400 ^oC showed a higher catalytic activity than other catalysts; the potocatalytic reduction efficiency of Cr(VI) reached 100% after 10 h.

Single shear lap creep specimens were developed using Ag particle-enhancement SnCu based composite solder to examine the influence of stress on creep behavior of the composite solder in this paper. Results show that the creep resistance of solder joints of particle enhancement 99.3Sn0.7Cu based composite solder is superior to that of 99.3Sn0.7Cu solder joints. At the same time, the creep rupture lifetime of the solder joints of the composite solders was decreased with the increasing of stresses and felt down faster than those of 99.3Sn0.7Cu solder joints.

The effect of welding processes friction stir welds (FSW) and (TIG) on fatigue properties of LF2 aluminum welded joints were analyzed and the S-N curve of the welded joints were established. The results show that the fatigue properties of FSW welded joints are better than that of TIG welded joints. Fatigue strength of friction stir welds is determined as 59~65MPa under N=106. Microstructures of joints are comparatively fine grain and narrow HAZ zone in the FSW welds which inhibit the growth of crack and produce high fatigue life compared to that of the TIG welds. Fracture morphologies of TIG welds show that the fatigue fracture occurs from weld defects.

Through the 3×3 orthogonal experimental design methods, the influences of the different temperature stages of 2–step annealing heat treatment on the mechanical properties and the microstructures of the TC18 titanium alloy were investigated. The influence of the changes of temperature on the mechanical properties was quantitatively analyzed. The results show that the stress level can be increased by increasing the middle–stage of temperature and lowering the low–stage of temperature; the elongation level can be increased by lowering the high–stage temperature and increasing the low–stage temperature; and the impact toughness can be upgraded also by lowering the high–stage and the middle–stage temperature. The stress levels of TC18 titanium can be controlled by the amounts of the β phase and α_s phase, the shape of α_s phase; the elongation levels can be controlled by the shape of αp phase and the shape of the αs phase; and the impact toughness is controlled by the shape and the amounts of the α_p phase.

The deformation and fracture characteristics of a low carbon Si–Mn steel with ferrite/bainite dual–phase structure were investigated by thermo–mechanical controlled process (TMCP). The results showed that the curves of the instantaneous work–hardening factor n* value versus true strain ε are made up with three stages during uniform plastic deformation: n* value is relatively higher at stage I, decreases slowly with  ε  in stage  II, and then decreases quickly with ε in stage III. Compared tothe equiaxed ferrite/bainite dual–phase steel, the quasi–polygonal ferrite/bainite dual–phase steel shows higher tensile strength and n*value in the low strain region. The voids or micro–cracks formed not only at ferrite–bainite interfaces but also within ferrite grains in the necked region, which can improve the property of resistance to crack propagation by reducing local stress concentration of the crack tips.

The 2.5 nm, 3.5 nm and 5.0 nm diameter CdS quantum dots had been synthesized using octadecylamine (ODA) as surfactant and solvent. The size and composition of quantum dots could be adjusted by changing the amount of added sulfur. The size of CdS quantum dots was increased with the increase of sulfur during the synthesis procedure. On the other hand, the excess sulfur will eliminate the sulfur vacancies effectively and suppress the surface state emission. The ODA could passivate the surface states presented on the surface of CdS quantum dots and suppress the surface states emission effectively.

The paramagnetic polymer particles with the size range of 0.6–20 μm were synthesized by microsuspension copolymerization with vinyl acetate(VAc) and divinylbenzene(DVB) in the presence of modified magnetite nanoparticles. Evident paramagnetic behavior was observed and saturation magnetization reached 16.7 emu·g−1 at room temperature. These magnetic microspheres were first activated by divinylsulfone, and then modified with mercaptoethanol. By using these thiophilic magnetic microspheres, immunoglobulin G (IgG) could be directly isolated from human serum. This thiophilic magnetic adsorbent performed an evident salt-dependent adsorption behavior for IgG. Due to their strong specificity towards IgG under high salt concentration, the absorbed antibodies could be extracted with high purity. The main factors to influence the isolation, such as the ion types, the ion concentration and the temperature, were also investigated. The technology has great potential to purify antibodies from human serum.

The solidification behavior and as-cast microstructure feature of a nickel-base Recontaining superalloy for conventional casting have been investigated. The results show that because of the adding of Re, the (γ+γ') eutectic temperature, MC carbide formation temperature and γ' precipitating temperature are increased, and the eutectic reaction segregation as well as solidification segregation is enhanced. There is a eutectic reaction segregation region around eutectic caused by eutectic forming. The pseudo-dendritic γ'  precipitates form, resulting from latent heat of eutectic reaction and impact of Re in γ'  precipitating temperature together.

Nanosilica was used to reinforce the selective laser sintering (SLS) parts of nylon–12, and a dissolution–precipitation process was successfully developed to prepare a nanosilica/nylon–12 composite powder (3% nanosilica) for SLS. The effect of nanosilica on the mechanical properties of the SLS parts was also investigated. The results show that nanosilica disperses uniformly on a nano–scale level in the nylon– 12 matrix; the composite powder has a smaller particle size than that of the neat nylon–12 powder, which helps to improve the sintering rate and part accuracy; the composite powder has much higher thermal stability than that of neat nylon–12; the tensile strength, tensile modulus and impact strength of the SLS specimens made from the composite powder are 20.9%, 39.4% and 9.54%, indicating that nanosilica has a remarkable reinforcement effect on nylon–12 SLS parts.

Yttria-stabilized zirconia (YSZ) films on Ni/YSZ substrates were prepared by electrophoretic deposition under constant voltage. Effects of YSZ content, applied voltage and deposition time on electrophoretic processes and YSZ film properties were investigated. Results showed that dense YSZ films can be obtained when 20 g/L YSZ suspension was used and a deposition voltage of 10 V was applied for 5 min. YSZ film contacts with anode substrate compactly with a thickness of 10 μm.