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Spark plasma sintering on mechanically activated W-Cu powders

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Rare Metals 2004年第3期23卷 269-273页

作者： jiachengchang LIZhigang HEYuntao QUXuanhui SchoolofMaterialsScienceandEngineering UniversityofScienceandTechnologyBeijingBeijing100083China

Mechanically activated W-Cu powders were sintered by a spark plasma sinteringsystem (SPS) in order to develop a new process and improve the properties of the alloy. Propertiessuch as density and hardness were measured. The microstructures of the sintered W-Cu alloy sampleswere observed by SEM (scanning electron microscope). The results show that spark plasma sinteringcan obviously lower the sintering temperature and increase the density of the alloy. This processcan also improve the hardness of the alloy. SPS is an effective method to obtain W-Cu powders withhigh density and superior physical properties.

关键词： powder metallurgy W-Cu alloy spark plasma sintering mechanical activation

Effects of rare earth element lanthanum on the microstructure of copper matrix diamond tool materials

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Rare Metals 2002年第2期21卷 90-94页

作者： jiachengchang SONGYueqing YUMing WANGTing ResearchInstituteofPowderMetallurgyUniversityofScienceandTechnologyBeijing Beijing100083China GeneralResearchInstituteofNon-ferrousMetal Beijing100088China

Effects of rare earth element La on the microstructure of Cumatrix diamond tools were researched under the conditions of variousmaterials components and the process parameters in order to improvematerials properties. SEM, XPS and X-ray were used to investigate thefracture section, microstructure and the element valence inmaterials. The Results shown that the combination of rare earthelement La and transition element Ti is advantageous to the bondingstate Between diamond particles and matrix, so it can improve thematerials properties. Suitable sintering temperature is 790 deg. C.

关键词： rare earth element La interface reaction Copper matrix diamond tool titanium

Combustion synthesis of radioactive waste immobilization

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Rare Metals 2005年第2期24卷 119-124页

作者： ZHANGRuizhu GUOZhimeng LUXin jiachengchang LINTao MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China／／NorthChinaInstituteofWaterConservancyandHydroelectricPowerZhengzhou450011China

Using chromium oxide (CrO3) as an oxidant, the immobilization of simulating radioactive waste in perovskite (CaTiO3) structure by a combustion synthesis (CS) method was tested. The products were characterized by Archimedes liquid displacement technique, microhardness technique, X-ray diffraction, and scanning electron microscopy. The leaching rate was measured by the method of MCC-1 or MCC-2. The primary results show that the CS method can be used to solidify the immobilizate waste effectively.

关键词： combustion synthesis radioactive waste Immobilization perovskite