Lil-yTiy FePO4 is synthesized by Ti doping with solid-phase processs, tudy is made of the effect of doped Ti content, roasting temperature and duration, as well as the electrochemical properties of lithium ion battery. The following optimum technological parameters were confirmed through Latin orthogonal experi- ment [L9 （3^3）] ： doped Ti^4＋ content 1% （x）, the roasting temperature 700 ℃, roasting duration 16 h. The test results proves that the optimized synthesis technology is good for improvement of electrochemical property of lithium ion battery anode material.

A series of low-Co type hydrogen storage alloys are prepared by vacuum induction melting. Through X-ray diffraction （XRD） and electrochemistry, systematical study and analysis is made of the elec trochemical performances （maximum discharge capacity, high-rate capability and recycle stability）, the mi crostructure and kinetic characteristics of hydrogen storage alloys.

Through re-melting Nb-based ultrahigh-temperature alloy in ZrO2 ,Y2O3 ,BN and Al2 03 crucibles at 2 053 K or 2 153 K respectively,the reaction behavior between the alloy melt and the above-mentioned crucibles was evaluated. It has been found that Y2O3 ,BN or Al2O3 crucibles contaminated the alloy melt to some extent. Although a reaction layer about 50-60μm thick and with many microcracks or etch pits exis- ted in the ZrO2 cucible wall adjacent to the melt after remelting,and HfO2 nd TiO2 as found in this layer, the ZrO2 rucible did not contaminate the alloy melt indeed. When YSZ coating was prepared directly on a graphite crucible,the reaction of ZrO2 with C took place. In order to prevent ZrO2 from reaction with C,a SiC inner layer was firstly prepared on the graphite by CVD method,and then ZrO2 coating was prepared on the SiC inner layer by soak and paint method.

Superfine crystalline WC-IOCo hard metal is prepared from nano-meter WC and super fine Copowder by the process of planet ball milling-pressing-hydrogen degumming and vacuum sintering. The testresults show that the use of planet milling resulted in evenly distributed fine-grained mixture with goodcompactability. The superfine hard metal prepared by vacuum sintering has particle size about 0.34 μm,bending strength S 100 MPa,hardness 1 900 kg/mme ,fracture toughness 10. S MPa · m^1/2.

Through orthogonal experiment,systematic study is made of the influence of upper bed/lower-bed gas temperature,metallic melt temperature and catheter projecting height on the average particle size and particle distribution of the powder prepared by multi-stream gas atomization. Through visual analysis and variance analysis, the extent of influence of various parameters was evaluated, and the parameters were op- timized. The results of the experiment showed that the optimum technological parameters are as follows： the pressure of the upper atomizer and the lower atomizer is 0.7 MPa and 0.4 MPa respectively,the tem- perature of molten metal is 350 ℃,and the projecting length of the catheter was 4mm,the mean particle size was 6.3 μm and 77.3 % of the powder has particle size〈10 μm. And the firsl wave crest value in the size distribution curve is about 500nm,which is an order of magnitude smaller than that as reported.

The influence of hot extruding and annealing on the microstructure and properties of three Mg-Zr alloys were investigated. The results showed that significant grain refinement during hot extrusion im- proved the mechanical property of the alloy. In cast condition,damping capacity increased with higher strain amplitude. However, upon hot extrusion, the damping capacity of the alloys is lowered remarkably, weakly depended on strain amplitude. Annealing of the hot extruded alloy resulted in damping capacity increase, but it was still lower than the as-cast alloy. The mechanical properties of Mg-0.6Zr-0.3Ca and Mg-0.6Zr- 0.3Ca-0.1Y alloys were higher than that of Mg-0.6Zr alloy in different conditions, and their damping ca- pacities were similar to that of Mg-0.6Zr alloy in cast condition, yet much lower after hot extrusion and an- nealing. The change of damping capacities of three alloys at different processing conditions could be ex- plained by the dislocation model of Granato and Lücke.

自2006年由中国硬质合金协会、中国国际贸促会上海浦东分会、上海星辉展览服务有限公司联合举办“中国国际硬质合金展览会”以来，连续两届展会均有众多知名企业参展，展会以其规模、效果、专业化而得到业界的认可。

In view of the difficulty in cracked lining withdrawl from the extrusion chamber of 3150T extru- der,specially-designed accessory unit is used to cut off and withdraw the cracked lining. Upon checkup and repair of the inner wall of the extrusion chamber,the extruder can again be put into operation. Through a- nalysis of the cause of the crack in the lining, corresponding improvement are made. The practice proved that this method and improvement are feasible and effective.

Study is made on the NH3/N balance calculation from ammonium molybdate production by ion exchange. Bench-scale test was done for ammonium removal by heating and alkalization from ammonium- bearing solution during ion exchange. The test results showed that under given technological condition, 99% of NH4-N can be effectively removed from the ammonium solution with waste water discharge up to Class II discharge norms as specified in GB8978--1996.

The applications of tribromoarsenazo in determination of total rare earth, cerium group and single rare earth elements by spectrophotometry was reviewed in the paper based on the comprehensive analysis of lots of literatures. The spectrophotometry covers absorption photometry, solid photometry,kinetic pho- tometry and calculation photometry, etc.