In the paper are summarized the market development of tantalum and niobium electrolytic capacitors and progress on the development and manufacturing of Ta/Nb capacitors both at home and abroad.

The current situation and prospect of separating scattered metals using solvent-impregnated resins(SIRs)process have been reviewed according to the types of SIRs.Such SIRs contain neutral organophosphorus extractants or acidic organophosphorus ones.The mechanism of SIR sorption is basically similar to the case of solvent extraction. The effective separation of scattered metals can be obtained under properly-controlled conditions.More study is required in respect of the improvement of the intensity and stability of the solvent-impregnated resin,separating mechanism,mass transfer mathematical model so as to provide theoretical criteria for its industrial application.The said technology will open up a new approach for the separation of scattered metals.

The preparation of metal powders,composite powders and alloy powders of high density alloy is reviewed.The process flowsheet and characteristics of various powders are introduced.The treatment of tungsten powder is also introduced.

In this paper are reviewed the scientific development of metallic nanometer particles in recent years in respect of basic effect,characterization,application,preparation and surface modification.The future research and development of metal nanometer particles are forecasted.

Brief description is made of the preparation technology,property and applications of ITO powder,ITO target materials and ITO transparent conductive membranes.The related information is reported on its domestic and foreign resource reserve, production and consumption.

Brief description is made of the preparation of ultra-pure W powder and W materials abroad.In the paper is reported assaying results of the ultra-pure W powdet and WSi_x.

The ultra-fine CeO2 precursor for optical glass polishing material was prepared by selective oxidation and precipitation, washing, drying and calcination from low-cerium complex rare earth chlorides solution with NH3.H2O as precipitator, air and H2O2 as oxidative agent.The effect of reaction conditions and feeding mode on the content of CeO2 in precursor,and the correlativity between calcination temperature and particle size,specific surface area and mineralogical composition of precursor powder were investigated.The results show that by forward dripping, pH value controlled within 4.5 and 5.5,Ce3+ can be oxidized into Ce4+ to form hydroxide precipitant,followed by separation with other RE ions the ultra-fine polishing powder and precipitation before calcinations at 600～700 ℃ to obtain ultra-fine CeO2 precursor with CeO2 content over 80%,median particle size D50 less than 1.5 μm.

A new type wearing-resistant alloy powder block was made from nano-structured WO3+C composite powder. Processing performance test is made for the analysis of surfacing layer structure,composition and hardness,etc.The results showed that the powder block has good welding processing performance,high deposition efficiency with tiny structure in the surfacing layer mainly containing W-enriched carbides of (Fe6W6C), acicular martensite and austenite.The hardness of the surfacing layer was over HRC60,max.HRC63.Compared to the micron powder,nano-powder block is characterized by higher W content in matrix,tiny structure,higher hardness,suitable for wearable surfacing.

Description is made of the theory and method of interfacial study between metal and ceramic,focusing on the interfacial structure?doping effect and active mechanism of various doping elements of Ti(C,N)-based cermet.Process for interfacial design and surface alloying is reported.

Failure analysis is made of cemented carbide die for drawing copper tube by scanning electron microscopy,etc.It was indicated that grain abrasion and adhesive abrasion were the main types of failure in the drawing die under boundary lubrication and dry friction.Based on the analysis of surface abrasion morphology and action of cyclic load and friction heat of the drawing die,theoretical analysis is made of its failure behavior.Based on the cause of the failures,exploratory suggestion is made for longer service life of the drawing die.