Molybdenum disulfide nanoparticles is prepared by thermal decomposition of ammonium tetrathiomolybdate.The morphology, composition and structure of the product is tested by TEM,SEM,XRD and ED.Results showed that the resultant dark-gray molybdenum disulfide nanoparticles have average diameter less than 100 nm.The product is hexagonal lattice,a=0.316 nm,c=1.229 nm,it is quite pure,almost free of impurities from comparison of X-ray diffraction pattern with JCPDS.ED analysis also showed that nanoparticles were highly-crystallized multi-crystals,with continuous and clear diffraction ring at surface such as (0004), (0110) and (0112) in conformance with XRD analysis results.Discussion is made on the factors affecting the formation of molybdenum disulfide powder such as the reaction temperature,duration,the material layer thickness,carrier gas flowrate,the reaction material.

CeO_2-catalyzed cobalt phthalocyanine is synthesized in situ inside KX molecular sieve by microwave radiation.Comparison is made between synthesis by microwave heating and by traditional heating.The synthesized product was characterized by IR and XRD methods.The catalytic activity of the product for the decomposition of H_2O_2 was investigated as well.

The principle,fearure and the technical process of recovery of W、Mo、Cr、V from high-speed steel tool grinding chips by pyrometallurgical process are introduced.The effects of raw material size and reducing reagent and lime on the recovery are analyzed.The results show that the technology is practicable.The recovery of W and Mo is more than 96%;Cr recovery is over 91%,the V recovery about 91%.The quality of product is stable enough for steel-making purpose.

Observation and analysis is made through SEM of Ti alloy IST brazing seams with several different Ag-based brazing filler metals at the same temperature and same duration.Analysis and discussion is made of the characteristic of different phases formed in the brazing joints,the effects of intermetallic compounds on the joint binding performance.

High-Si aluminum alloy is fabricated by air-atomization water cooling and vacuum canned hot extrusion.The powder has gone through morphology SEM,density test、microstructure analysis and mechanical property testing.Experimental results have shown that,compared to the as-cast sample,the resultant material is characterized by very uniform,dispersed and fine Si initial crystal,obviously higher tensile strength.With the increase of extrusion temperature and Si content and the primary silicon crystal was fined and evenly distributed.Otherwise,with the increasing extrusion temperature,the particle size of initial Si crystalline phase becomes larger and the tensile strength drops.

The new AgSnO_2 contact material is developed by chemical co-precipitation and powder hot forging.Analysis and testing is made of its structure and physical properties such as density,hardness and resistivity,etc.

An oscillopolarographic method for the rapid determination of trace germanium in the medium of gallic acid-V(Ⅳ)-EDTA was presented.The peak potential was at-0.60 V,the linear range of the determination was 5×10^-8～2×10^-6 g/L,and the detection limit was 4×10^-9 g/L.The method is directly used for the rapid determination of trace germanium in zinc electrolyte solution with satisfactory results.

Soluble silicate is dissolved in hot water from the trial sample,then hydrofluoric acid is added to dissolve insoluble silicate.At pH=1.5～2.0,silicate ion and ammonium molybdate becomes the yellow silicon-molybdenum heteropoly acid and is reduced into silico-molybdenum blue by the reductant.The resultant material shows maximum absorption peak at 810 nm,the apparent mol light absorption coefficient is 1.2×10~4 L/(mol·cm ),content ranges 0～100 μg/50 ml, as conforms to Beer's Law.The method can be directly used for total silicon determination from commercial and reagent chloride potassium.

Description is made of several feasible technologies,process flowsheet and main technical parameters for the treatment of APT crystal parent solution.

This paper reviews the latest research on W-Ni-Fe,W-Ni-Cu,W-Cu high-density tungsten alloys.It introduces some key techniques for tungsten alloys,and points out research directions of tungsten alloy materials.