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Cheng L.,Inner Mongolia University of Science and Technology | Cheng L.,Baotou Tianjiao Seimi Rare Earth Polishing Powder Co. | Ren H.-P.,Inner Mongolia University of Science and Technology | Ren H.-P.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | And 2 more authors.
Chinese Rare Earths | Year: 2015

Ceria-based rare earth polishing powder was prepared with lanthanum cerium carbonate and neodymium-poor RE carbonate as precursor. The influence of fluorine content on phase composition and morphology and the change of morphology of polishing powder particles before and after grinding were investigated. The results show that the ceria-based rare earth polishing powder consists of the base phase Ce1-xLaxO2 and the second phase which distribute in the base phase. The second phase is changed from CeF2 to LaF2 and LaF3 with the increase of fluorine content. By comparing what happened before and after the experiment, the particles are obviously grinded at the particles sharp angle. The grinding occurs at (001) direction. It is find that (100) crystal plane is increased and (111) crystal plane is induced at the end of grinding. © 2015, Editorial Office of "Chinese Rare Earths". All right reserved. Source


Chen W.-P.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Chen W.-P.,Inner Mongolia University of Science and Technology | Zhang H.,Inner Mongolia University of Science and Technology | Xie Z.-H.,Inner Mongolia University of Science and Technology | Ji Y.-P.,Inner Mongolia University of Science and Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Isothermal oxidation experiment at 950-1250℃ in vertical tube furnace for a low-carbon and low-alloy steel containing anthanum-cerium rare earth compound was carried out. The oxidation kinetics curves were plotted by thermal gravity analysis (TGA) method. Morphology of the surface oxidation films was observed by scanning electron microscopy (SEM). The results show that the isothermal oxidation kinetic curves at 950℃, 1050℃, 1150℃ and 1250℃ all conform to the parabolic laws and the oxide film has the protective effect. The reaction activation energy of the low-carbon and low-alloy steel is increased and the oxidation rate constant is reduced by the addition of rare earth, so the high-temperature oxidation resistance of the steel is improved, and the steel with higher content of rare earth exhibits the higher high-temperature oxidation resistance. By adding the lanthanum-cerium rare earth compound, the grains of the surface oxidation films of the low-carbon and low-alloy steel are refined and the binding strength between the oxidation films and the matrix is improved, so the oxidation films are not easy to peel off, which is beneficial to improving the oxidation resistance of the steel. © 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved. Source


Liu Z.-X.,Inner Mongolia University of Science and Technology | Hu Y.-S.,University of Science and Technology of China | Wu Y.-F.,Inner Mongolia University of Science and Technology | Wu Y.-F.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | And 2 more authors.
Chinese Rare Earths | Year: 2015

In this paper a mathematic model of 3KA rare earth electrolysis cell was developed by using the finite-element analysis software ANSYS WORKBENCH to analyze the impact of several different common anode carbon block material on the electric filed of rare earth electrolysis cell. Calculation results show that melt voltage of semi-graphitic, semi-graphitized and graphitized anode carbon block are 5.8575V, 5.7699V, 5.6791V. Through the comprehensive consolidation, choosing graphitized electrode can reduce costs and improve the overall economic benefits of rare earth industry. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved. Source


Hou J.,Inner Mongolia University of Science and Technology | Ji Y.,Inner Mongolia University of Science and Technology | Jin X.,Inner Mongolia University of Science and Technology | Jin Z.,Inner Mongolia University of Science and Technology | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

The microstructure and mechanical properties of 20MnCrNi2Mo wear resistant cast steel alloyed with rare earth La and Ce were investigated by means of scanning electron microscope, transmission electron microscope, Rockwell hardometer, electronic universal testing machine and electronic pendulum impact testing machine. Then the relationship between microstructure and mechanical properties of the tested steel was analyzed. The results show that the microstructure of 20MnCrNi2Mo wear resistant cast steel is granular bainite with high density dislocation. The hardness of 20MnCrNi2Mo wear resistant cast steel alloyed with 0.0092% RE is 32.11 HRC. The tensile strength and impact absorbtion energy (-40℃) are 1128. 48 MPa and 9.887 J respectively. The high-density dislocation can improve the hardness of the tested steel, but can decrease the plasticity. The (M/A) islands in bainite may increase the hardness and tensile strength, but decrease the toughness of the steel. The rare earth elements in the tested steel can modify the inclusions and then improve the toughness of the steel. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved. Source


Hou J.,Inner Mongolia University of Science and Technology | Ji Y.,Inner Mongolia University of Science and Technology | Jin X.,Inner Mongolia University of Science and Technology | Ren H.,Inner Mongolia University of Science and Technology | Ren H.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Bainite tempering transformation of 20MnCrNi2Mo steel was investigated by Rockwell hardness tester, scanning electron microscope and transmission electron microscope. The results show that when the granular bainite of 20MnCrNi2Mo steel is tempered at 200 ℃, the decomposition of M/A islands are not happened basically. M/A islands decompose gradually with the increase of tempering temperature. When tempered at 500 ℃, a lot of M/A islands decompose, the dislocation density decreases and the carbides precipitate. When tempered at the range of 200-500 ℃, the change of hardness is not obvious. The hardness decreases sharply when the tempering temperature is higher than 500 ℃ because of complete decomposition of M/A islands and growing up of carbides. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved. Source

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