Impact of La on Inclusions and Corrosion Resistance of Pure Steel

JIANG Xue-zhi;WANG Bao-feng;LI Chun-long;WANG Quan

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 28-31

Study is made of the impact of La on the corrosion resistance of pure steel through the observation of the morphology of RE inclusion in the pure steel, testing of electro-chemic corrosion EIS and polarization curve. The test results showed that addition of La into the pure steel can modify the inclusion and improve the morphology of the inclusion thus to improve the corrosion resistance of the pure steel.

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Application of Mathematic Method in the Spectrophotometric Analysis of Tungsten

LI Bo

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 32-34

Systematic description is made of the application of mathematic method in the spectrophotometric analysis of tungsten. And brief introduction is made to the testing principle, method and applicable range.

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Determination of Phosphor in Ta Powder through Induction Coupling Plasma Mass Spectrometer

LIU Shi-yi;YU Xiao-qing;WANG Jing;SONG Jin-hua

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 35-37

Description is made of the determination of trace impurity phosphor in Ta powder through ICP-MS. Based on the investigation into the testing condition, hydrofluoric acid-resistant inert feed system, shielded torch and cold plasma technology,phosphor concentration in Ta powder is determined by standard dosage method.

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Research on Connection and Interface Thermal Stress of W/Cu for Plasma Facing Components of Tokamak Unit

ZHONG Fa-li;CHEN Jun-ling;LI Jian-gang

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 38-41

Discussion is focused on the following connection methods of W/Cu composite material for plasma facing components of Tokamak unit：electron beam welding,brazing, hot isostatic pressing,sintering and infiltration,vacuum plasma spray. Description is made of the heat load test under electron beam irradiation upon successful connection of PFM with heat sink material. Then stress solution and distribution of W/Cu material under heat load test is also discussed.

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The Latest Research on Separation and Recovery of Gallium and Indium with Chelating Resins

LIU Jun-shen;LI Gui-hua

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 42-45

Based on the types of chelating resins, the paper reviews the research on Ga and In separation with chelating resins mainly of phosphate and hydroxyl-acid types. The separation with chelating resin is characterized by high selectivity,large absorption capacity and good stability as a new alternative for separation and recovery of Ga and In.

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The Current Research and the Development Trend of Hydrogen Storage Alloy

LIU Sheng-lin;SUN Dong-bai

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 46-51

Description is made of the development and latest research of hydrogen storage alloys. The developing trend of hydrogen storage alloy is predicted.

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Latest Research on Tungsten Electrode

YANG Xiao-qing;LUO Zhen-zhong;GUO Rong-hui;HE Yue-hui

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 52-54

Tungsten electrode materials are classified in this paper. And brief description is made of the performance of the different types of tungsten electrodes. Detailed preparation and latest research on several typical tungsten electrodes are reviewed together with the introduction of the application and development of the tungsten electrodes.

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Environmental Pollution and Treatment ofrom Tantalum and Niobium Hydrometallurgy

XUE Mei

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 55-59

Analysis and discussion is made on the source,type, nature and harm of the pollution from tantalum and niobium hydrometallurgy. Primary pollutants include waste residue,waste water,exhaust gas containing with fluoride,radioactive waste,organic extractant. Pollutant control measures are put forward.

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Calculation and Plotting of Standard Gibbs Free Energy Change for TiC Coating Reaction

LIU Sha;ZHANG Jing-qiu

Rare Metals and Cemented Carbides | Vol., Issue 4, 2005 | pp. 60-62

Based on the example of CVD （chemical vapor deposition） TiC coating reaction, calculation is made and plotting model is established for standard Gibbs free energy change. Accurate calculation and plotting of the standard free energy change for CVD TiC coating reaction are realized based on the developed calculation and plotting programs.

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Study of Separation of Tungsten and Molybdenum from High W-containing Molybdate Acid Sodium Solution by Fe(OH)_3 Adsorption

LV Ying;SUN Fang

Rare Metals and Cemented Carbides | Vol., Issue 3, 2005 | pp. 1-3

Study is made of the possibility and technical requirements of separating tungsten from high W- containing Na2MO4 solution by Fe （OH）3 adsorption. The results showed that each absorption resulted in 70 % ～80 % tungsten separation from molybdenum at pH = 7.0 and with consumption 2～4 times more than that of WO4^2- . When WO3/Mo = 0. 445, WO3/Mo is reduced down to 0.17～ 0.18 through the first absorption. A new method is developed to neutralize sodium molybdate solution with HCl and NH4Cl as neutralizer, which can notably improve recovery and separating effect.

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