The microstructure, phase composition and mechanical properties of Ti-40Al-3.5Nb-0.8Mo-0.3Y superalloy were studied by scanning electron microscope,X-ray diffractometer and tensile test. The results show that the chaotic βphase in Ti-40Al-3.5Nb-0.8Mo-0.3Y alloy can effectively improve high tempera- ture resistance of the alloy. Hot isostatic pressing and homogenization processes improve the density of the alloy. The tensile strength of the alloy at room temperature is 583 MPa, with flat tensile fracture morpholo- gy and brittle transgranular cleavage fracture characteristics. When the tensile test temperature gradually rises from room temperature to 760 ℃ ,the tensile strength of the alloy continuously declines,and the elon- gation of the alloy gradually rises of brittle fracture characteristics.

La0.6Sr0.4CoO3 perovskite-type oxide was prepared with sol-gel method, and the effect of calcina- tion temperature on its electrocatalytic properities in bifunctional oxygen electrodes was particularly stud- ied. The phase and morphology of La0.6Sr0.4CoO3 perovskite-type oxide were analyzed by XRD, SEM and BET,and the steady-state polarization curves and steady-state galvanostatic curves of the cathode and an- ode of the bifunctional oxygen electrodes were plotted in a three-electrode system. The results show that increasing the calcination temperature is advantageous for decreasing the impurities in La0.6Sr0.4CoO3 per- ovskite-type oxide. When the calcination temperature reaches 800 ℃, pure La0.6Sr0.4CoO3 perovskite-type oxide is obtained with the highest catalytic activity,and the bifunctional oxygen electrode owns the lowest electrochemical polarization and the highest stability.

The static nitriding and bottom-blown nitrogen nitriding processes of Sm-Fe melt were re- searched. The phase, morphology and composition of nitrided alloy samples were investigated through XRD,SEM and EDS, respectively. And the effects of the two nitriding processes were compared. The results show that during static nitriding of Sm-Fe alloy melt,the surface of the sample is easy to form highmelting-point refractory Sin2O3. Sm2O3 covers Sm-Fe alloy surface to hinder the diffusion of N atoms into the melt,and therefore the static nitriding method fails to achieve the desired nitriding effect. The nitrogen element is found in Sm2Fe17 phase of the alloy sample after bottom-blown nitrogen nitriding,and the main peak of Sm2Fe17 phase shifts to a smaller angle,indicating that N atoms enter Sm2Fe17 phase and the nitriding effect is good.

Jarosite was prepared from titanium white waste water by adding potassium chlorate and potassi- um hydroxide. The effects of reaction temperature,solution pH and reaction time on Fe precipitation rate were investigated. And microstructure and phase composition of the precipitated product were also ana- lyzed. The results show that the precipitation rate of Fe from titanium white waste water is more than 99% under the conditions of temperature of 95 ℃, solution pH of 2.0 and reaction time of 40 min. The precipita- ted product is the acicular crystal of jarosite. In addition to the significant decrease of SO4^2-and Fe2＋ concentrations in the filtrate,the contents of the rare metal ions such as Ti,V and Sc are almost unchanged, which is beneficial for the separation and purification of rare metals in the next process step.

The industrial method for lithium isotope （6Li and 7Li） separation is using amalgam. However, this method requires the use of plenty of toxic mercury, causing serious human health and environmental problems. Gallium is a kind of liquid metal like mercury. Phase equilibrium diagrams of Hg-Li and Ga-Li are compared, and it is found that the two systems are very similar. Therefore, gallium may replace mercu- ry to separate lithium isotope. Gallium-indium alloy of lower eutectic temperature was selected to separate lithium isotope. The results show that the lighter isotope 6 Li is preferentially fractionated into gallium-indium alloy with single-stage lithium isotope separation factor of 1.01. Gallium-indium alloy has the poten- tial for the separation of lithium isotope with certain development prospects.

The texture and microstructure evolution law of hot-pressed sintered beryllium ingot during warm-rolling was studied by electron backscatter diffraction （EBSD）. The results show that slip is the main deformation mechanism during warm-rolling. With the increase of rolling deformation, the grains are gradually elongated and refined. When the reduction reaches 37.9%, the basal texture in rolled beryllium sheet reaches a maximum value. And then continuously increasing the reduction, all the texture, grain size and mierohardness of beryllium material no longer change significantly. The annealing process is required during or after rolling of beryllium material. The annealing process has a certain weakening effect on the basal texture of beryllium sheet,which can improve its internal microstructure and rolling performance.

The influences of activation temperature and activation duration of heat preservation on the hy- drogen absorption/desorption performance of ZrVFe alloy were investigated. The transformation of phase structure of ZrVFe alloy before and after hydrogen absorption/desorption was analyzed by XRD. Pressure- composition- temperature （P- C- T） plots of ZrVFe alloy during hydrogen absorption/desorption were drawn. And standard enthalpyΔSΘ, and standard entropy AHe of hydrogen absorption/desorption reaction of the alloy were calculated using Van＇t Hoff equation. The extrapolated equilibrium hydrogen pressure of hydrogen absorption/desorption can reach the levels of 10^-8 Pa and 10^-10 Pa at room temperature,respec- tively. Furthermore,ZrVFe alloy has excellent air poisoning resistance and pulverizing resistance.

Using Ni60A,Ni60CuMo and Ni60WC10 powders of 53 - 150 μm particle size as raw materials, the corresponding coatings were prepared with Castolin SuperJet S flame spray welding system. The mi- crostructure and wear resistance of the coatings were analyzed by metallographic microscope,X-ray diffrac- tometer （XRD）, scanning electron microscope （SEM） and friction and wear test machine. The results show that all the Ni60A,Ni60CuMo and Ni60WC10 coatings exhibit high hardness （HRC^57.0） and lower po- rosity （〈1.0%） ,and there is metallurgical bond between the coating and the substrate. The main diffrac- tion peaks of each coating are from Ni-based solid solution,and there is obvious WC diffraction peaks in the Ni60WC10 layer. The wear resistance of Ni60WC10 coating is about 2.5 times higher than that of Ni60A coating and about 3.5 times higher than that of Ni60CuMo coating.

The ceramic coating on metal surface was synthesized by hot dipping with the matrix of 304 stainless steel and the dipping solution of Al（NO3）3 solution. The influences of different Al（NO3）3 concentra- tions, heating temperature and time on the properties of ceramic coating were determined by XRD,hard- ness test and corrosion resistance test. The results indicate that the composition of ceramic coating is Al2O3 and Al（OH）3. Ceramic coating has significantly increased hardness, approximately 1. 13--4. 60 times as high as that of stainless steel matrix. And the ceramic coating also has good corrosion resistance.

Schiff base transition metal monomers of Ni（salphen） and Ni（CH3O-salphen） were synthesized with simple two-step method. The monomers were easily electropolymerized onto MWCNTs by cyclic voltammetry to form composite electrodes as the supercapacitor cathode materials. The experimental results show that the addition of the substituent methoxy groups into Schiff base transition metal makes the polymer exhibit better electrochemical activity and larger specific capacity, and the polymer material also ob- tains significantly improved electrochemical performance. In addition,XPS analysis results show that energy storage is achieved by the pseudocapaeitance contributed by the reversible change of active groups in the polymer during charge and discharge,rather than by the capacity contributed by Ni valence change.