The yttrium aluminum garnet （YAG） fibers were chloride, aluminum powder, yttrium oxide, acetic acid as raw YAG fiber phase and morphology were studied. The results YAG phase,with smooth surface and uniform diameter. ZrO2 prepared by sol-gel method using aluminum materials. The effects of zirconia addition in showed zirconia-containing fibers remains in can be used as YAG fiber toughening phase.

In view of adjacent atomic number, the uniformity of tungsten rhenium alloy is difficult to charac- terize. The tungsten rhenium alloy morphology of polished section is characterized by SEI and BEI. The high rhenium region and the low Re region in the polished section of tungsten rhenium alloy were success- fully classified through a scanning electron microscope with spectrometer. The distribution of Re element in -Re alloy is shown clearly. In addition, the feasibility of this method is analyzed theoretically, as can pro- vide reference for the analysis of the uniformity of the alloys of adjacent elements such as W-Re.

Description is made of the latest development of molybdenum alloys. The paper has described systematically the brittle mechanism, strengthening type and toughening mechanism of the molybdenum alloys. It is pointed out that the development tendency of high-performance Mo alloy is toward RE-doped Mo-based composite.

The effect on the oxidation and dissolution of WC in different antirust solutions is investigated through electrical conductivity measurement, scanning electron microscopy （SEM） and Auger electron spectroscopy （AES） analysis. New composite antirust agent was prepared using multi-element recombina- tion based on the synergistic effect of different antirust. The experimental data shows that the antirust in- cluding p-nitro-benzoic acid tri-ethanolamine ester, sodium oleate soap, sodium borate and sodium molybdate can effectively inhibit the oxidation and dissolution of WC. The leaching rate of tungsten on the sur- face of carbide blade is only 2.85% ,which is significantly lower than the leaching rate in aqueous media.

The large-sized coal mill gear shaft was repaired by supersonic thermal spraying with WC-Co composite powder synthesized by in-situ reaction. The microstructure, phase composition and mechanical properties of the coating are characterized. The test results show that the coating prepared by supersonic thermal spraying with ultrafine WC-Co composite powder could tightly bond with the matrix of the gear shaft with compact microstructure, small amount of decarburized phases formed at high temperature in the coating, distinctly better surface hardness and wear resistance. Therefore, the excess wear of the shaft can be remedied,and the life of the machine can be prolonged with remarkable economic benefit.

Cu-5 0/40 C alloy powder is prepared by mechanical alloying and copper-carbon alloy enforced copper -graphite composite,Cu-（Cu-5 % C）-C is prepared by powder metallurgy. Study is made of the power manu- facturing technology and the influence of Cu-Swt%C alloy powder on the physical performance and micro- structure of composites. The results show that with the ball milling time increases, the lattice constant of Cu goes up first then falls down, the diffraction peak strength of copper and graphite is decreased, while FWHM is gradually increased. After 40 h ball milling,the graphite peak disappears. Upon 3 h annealing at 400℃ the secondary phase Cu20 peaks disappear and the graphite peaks is not reproduced when the graph- ite content is 4% and carbon content in the alloy is ≤1.5% ,the electrical conductivity of Cu-（Cu-5%C）-C composite sample can be up to 61% IACS. And when carbon content in the alloy is 1. 0%, the yield strength of the composite is remarkably increased. When carbon content in the alloy is 1. 5%, the alloy phase in the composite is seriously decomposed, resulting in much lower enhancing effect.

Nitrogen content in uranium-niobium alloy was determined by pulse melting heat conduction with LECO TC-436 analyzer. The effect factors such as analysis power, flux types, sample weight on determination results were discussed and the optimum analytical conditions were identified. The results show that the RSD for determination of nitrogen content in uranium-niobium alloy is less than 15 %, and the recovery of the nitrogen is 84%～93%, detection lower limit is 20μg/g, which is basically consistent with that by Kjeldahl for the determination of the nitrogen content.

四川航空工业川西机器有限责任公司（原名四川航空工业川西机器厂）始建于1965年，隶属于中国航空工业集团公司，是集科研、制造、服务于一体的国有大型二类企业。

Tungsten and molybdenum were extracted from scheelite chemical beneficiation acidic leachate with the organic system of 15 % N235 ＋ 10 %TBP＋75 % sulfonated kerosene. The saturated loading capacity for Mo and WO3 of the organic system reaches 90.73 g/L,and the extracted complex ratio between N235 and Mo and WOa is 0. 886. Mo and W are extracted mainly in the form of MoO2Cln（n-2）- and H2WO4 ,respectively, Fe in the form of complex anion and P in the form of H3 PO4. The single stage extraction rates of Mo,WO3,Fe and P are 76.3%,94.8%,99.1% and 7.5% ,respectively. The loaded organic phase was eluted using dilute HC1 solution （pH=2）. The removal rates of Fe and P reach 99.6% and 77% ,respectively. The single stage stripping rates of Mo and WOa are 88.35% and 66.52% ,respectively by using 2 mol/L NaOH solution.

Sodium tungstate was prepared by roasting plus sodium-leaching-ion exchange and with waste tungsten-nickel hydrogenation catalyst as the raw material. The results show that the tungstate leaching rate from waste catalyst can reach 99% when the catalyst grinding size is 0. 15 ram, the ratio of Na2CO3 dosage to WO3 dosage 0.69, leaching temperature 90℃, and leaching time 1 h. The saturation ion-exchange capacity of WO3 is 332.9 gw%/L-dry resin with the method of serial column absorption. The WO3 desorption rate is 98.2% with 2 mol/L NaCl and 1 mol/L NaOH mixture solution as the desorption agent. The purity of sodium tungstate is 99% after recrystallization.