In view of the low working capacity（ penetrating capacity） ,low allowable concentration of WO3, Cl^- , OH^- in feed solution in ion exchange process, systematic study is made of the height difference of exchange zone and its adaptability to WO3, Cl^- , OH^- concentration of the modified resin. The results show that the property of the modified resin is remarkably better than that of the marketable resin 201 7 and the feed solution concentration of the commercial solution. A new ion exchange process is developed based on the new modified resin with equipment and operation concentration of the feed solution is doubled. process similar to that for the typical process and the concentration of the feed solution is doubled.

Thermodynamic calculation is made to analyze the possible reaction of Y2 O3, ZrO2, Al2 O3, MgO, Cao,Ce2O3 and BeO with the main elements Nb,Si,Ti and Hf of the new Nb silicide-based superalloys at high temperature. The curve of relationship between △G^- and temperature T for those reactions is obtained. Through analyzing and comparing the chemical stability of several oxides with the melt of Nb silicide-based superalloys,it is found that both Y2 O3 and BeO are chemically stable to these alloy elements at high temperature,and Y2O3 is well suitable for the coating of graphite crucibles to melt Nb silicide-based superalloys.

The anode material of olivine LiFePO4 is prepared by microwave heating. The structure,morphology of particles and electrochemical performance of the samples were investigated by X-ray diffraction, scanning electron microscopy,cyclic voltammetry and constant current charge-discharge test. The effect of different carbon sources, e. g. dextrose and conductive carbon black is studied. The results show that the single phase LiFePO4 powder can prepared by this method at a low discharging rate,the initial specific discharge capacity of the anode material with dextrose as carbon sources is 131. 1 mA · h/g the circulating performance is good with only 2.1 % capacity fading after 30 discharge-charge circles. The specific discharging capacity of the anode material with conductive carbon black as carbon sources is 118. 3 mA · h/g the circulate performance is good with only 5.2% capacity fading after 30 discharge-charge circles.

TiN-Al3Ti-Al composite coating is prepared by reactive plasma spraying. Phase analysis and surface morphological analysis is done through XRD,SEM. The results show that the coating mainly consists of TiN-Al3Ti-Al;the structure of the coating is multilayer which includes rich horniness and rich flexible composition stacking together. The Vickers-hardness indentation and the fractography show that the toughness of the composite coatings is much better than that of the Al2O3 coatings.

The tungsten-inert-gas （TIG） welding test on YG30 cemented carbide and the 45 # steel was done with Co-Fe-C alloys in different composition as filling materials. The phase constituents,microstructure and hardness distribution near YG30/weld interface was analyzed by means of scanning electronic microscopy （SEM）, X-rays analyzer and microhardness tester. The results showed that the detrimental multicarbides（called as （phases, hereafter） were decreased or inhibited by properly increasing Co content in FeC alloys. When the Co content was 73%wt, no η phases were formed near the YG30/weld interface. The hardness distribution near the YG30/weld interface were smoothly transited with the increase of Co content in the filling materials.

Effect of annealing technology on the mechanical properties and physical properties of rolled CPC electronic composite packaging material was investigated in this paper. The results show that annealing technology has an important effect on the properties, including shear strength of the interface, rolling direction electric conductivity and through-thickness thermal conductivity of the composite material. The CPC electronic packaging materials have the best integrated properties when annealed under the temperature of 900 ℃ for 1.5 hours.

Study is made of the influence of RE elements of Ce,Er,Y and Sc on the physical property, wetting property and mechanical property of Sn-Ag-Cu alloy with Sn-3.0Ag-0.5Cu-based solder as master alloy. The test results show that rare earth elements would affect in different way the property of the solder. The addition of trace rare earth Ce in the solder can further improve the property.

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