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Jin L.,Beijing Aeronautical Science and Technology Research Institute | Liu G.,Changzhou LanXiang machinery Co. | Li P.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co. | Zhou H.,Beijing Aeronautical Science and Technology Research Institute | And 2 more authors.
Ceramics International | Year: 2015

The effects of ceramic dopant species and amount on adhesive strength and thermal shock resistance behavior of nanostructured thermal barrier coatings (TBCs) were investigated in detail. Firstly, nanostructured 5wt% La2O3+3wt% TiO2+92wt% YSZ(5La3TiYSZ), 8wt% La2O3+92wt% YSZ (8LaYSZ) and 8wt% CeO2+92wt% YSZ(8CeYSZ) coatings were prepared using atmospheric plasma spraying (APS) technology under the same technic parameters. Secondly, microstructure, adhesion strength and thermal shock behavior of three kinds of coatings were discussed. The results show that 5La3TiYSZ has the highest adhesion strength and the best thermal shock resistance in three kinds of coatings. The adhesion strength and thermal shock life for nanostructured TBCs heavily depend on ceramic materials. Among dopants nanostructured TiO2, La2O3 and CeO2 oxides, TiO2 can take relatively good effects in YSZ and the reason are also discussed using first principles. © 2015 Elsevier Ltd and Techna Group S.r.l. Source

Fu X.,Wuhan University of Science and Technology | Chen Y.,Wuhan University of Science and Technology | Yu G.,Wuhan University of Science and Technology | Zhang K.,Wuhan University of Science and Technology | And 2 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2011

With Pr 6O 11 and Mn(NO 3) 2 as raw materials, ultrafine perovskite PrMnO 3 was prepared by sol-gel method and vacuum drying technology. The perovskite was characterized by TG-DTA, XRD, TEM, and FT-IR. The photocatalytic activity was tested by photocatalysis degrading methyl orange solution in the system of PrMnO 3 suspension, irradiated under ultraviolet lamp. The results showed that at 170°C, the Pr-Mn xerogel was loose khaki powder with good dispersibility. The xerogel was made up of a mass of global grains with uniform size whose diameters were about 10~20 nm. In the process of thermal treating on Pr-Mn xerogel, the crystalline phase Pr 6O 11 and Mn 2O 3 appeared at 500 and 700°C, respectively; The crystallization process of manganese oxide was affected by Pr; After thermal treating at 900°C, the pure crystalling phase ultrafine perovskite PrMnO 3 was prepared, and the particle size was smaller than 100 nm. Taking the 300 W UV lamp as the photo source, 10 mg · L -1 methyl orange degradated by the superfine PrMnO 3 powder, the degradation efficiency was 100% at the radiation time 2 h, this degeneration process was the dynamics first-level reaction. Source

Chen H.-C.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co.
Chinese Rare Earths | Year: 2014

Based on the analysis of distribution and occurrence of rare earth in Bayan Obo, this paper studied the beneficiation of Bayan Obo rare earth minerials associated with iron minerals by using floatation. Effects of grinding granularity, dosage of reagents, temperature, pulp density and pH value on floatation index of rare earth were investigated. The results show that the optimal floatation conditions are grinding granularity 20 μm~50 μm, temperature higher than 60℃ and pulp density for rougher floatation 55%~65%. Source

Zhu X.,Northeastern University China | Sun S.,Northeastern University China | Lu S.,Northeastern University China | Huang X.,Northeastern University China | And 5 more authors.
Thermochimica Acta | Year: 2016

The surface tensions of REF3-LiF (RE = La and Nd) molten salts (REF3 mol% = 20-40%) were measured using the slide method over the temperature range1223-1423 K which was specifically chosen for meeting the actual electrolysis temperature (about 1323 K). The temperature and composition dependences of the surface tensions were investigated. The results showed that the surface tension decreased linearly with the increasing of temperature and increased nonlinearly with the increasing mole fraction of REF3. At 1323 K (near the practical electrolysis temperature), the surface tension of REF3-LiF-RE2O3 molten salts firstly increased with the increasing RE2O3 and reached the maximum value near the solubility of RE2O3 (2-3 g) in REF3-LiF molten salts, and then decreased with the continuously adding RE2O3. The accurate knowledge of the surface tension factor of RE2O3 can be useful for well understanding the solubilizing mechanisms of RE2O3 in REF3-LiF molten salts system. Results of this study well supplemented the experimental data of physiochemical property on surface tension of rare earth fluoride electrolytes. © 2016 Published by Elsevier B.V. Source


Rare earths; rare earth metals; salts from rare earth metals; alloys of rare earth metals; rare earth oxide.

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