Showing papers in "Rare Metals in 2015"

TL;DR: In this article, a review of the main processes that were developed in the past toward greener hydrometallurgy of rare earths in China is presented, with the focus on comprehensive utilization and cleaner production to support the sustainable development.

TL;DR: In this article, the effect of Al content on the microstructure and solidification characteristics of Ti-Al-Nb-V-Cr alloys in as-cast and isothermally treated states was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectroscope (EDS), and transmission electron microscope (TEM).

TL;DR: In this article, the magnetic field-induced shape memory effect in Ni-Mn-Ga, NiMnZ (Z = In, Sn, Sb, Al), and NiCoMnz (Z −1, Sn −2, Al) Heusler-type MSMAs is discussed.

TL;DR: In this article, the differences in the leaching and mass transfer characteristics of ion-adsorption type rare earth ore between rare earth and non-rare earth impurities were investigated.

TL;DR: In this article, the effects of various structure factors on the properties (superelasticity mainly) of Cu-based shape memory alloys (SMAs) were systematically evaluated in a review article through literatures combining with our work.

TL;DR: In this article, the corrosion behavior of the as-cast and extrusion and aging treatment Mg-2Zn-0.2Mn alloy in simulated body fluid (SBF) were studied.

TL;DR: In this paper, the effect of feed rate on spheroidization efficiency was investigated and the phase composition, oxygen content, morphology, and particle size distribution of spherical tungsten and titanium powders were characterized by X-ray diffraction (XRD), nitrogen/oxygen analyzer, and scanning electron microscopy (SEM).

TL;DR: In this article, the authors investigated the catalytic performance of the unsupported Cu and Ag catalysts with different oxidation states for propylene epoxidation and found that adding Ag to the metallic Cu catalysts can prevent the oxidation of Cu and make AgCu>>\s more stable under the condition of propylene Epoxidation.

TL;DR: In this paper, the effects of carboxylic acid collector, benzohydroxamic acid (BHA), sodium hexametaphosphate (SHAP), sodium silicate, and oxalic acid on scheelite flotation were studied through flotation tests, quantum chemical calculation, and flotation solution computational chemistry.

TL;DR: Predicted results show that the relative error of OD algorithm is smaller than those of BP and RBF neural network methods.

TL;DR: In this article, a detailed analysis of the wet-etching technique for AlGaN/GaN heterostructure using dry thermal oxidation followed by a wet alkali etching was performed.

TL;DR: Dry sliding wear tests were performed for 7075 Al alloy under a load of 25-250 N at 25-200°C as discussed by the authors The wear behaviors and mechanisms under various testing conditions were explored A mild-to-severe wear transition is noticed to occur with an increase in the load at 25−200 °C With the temperature increasing, the wear loss decreases constantly under the low load of less than 50 n.

TL;DR: In this paper, a high-temperature pyrometallurgical process was developed in order to recover valuable rare earth elements from Nd-Fe-B permanent magnet scraps, and the effects of temperature and reaction time on the reduction of B2O3 in oxide phase were investigated.

TL;DR: In this article, the effect of temperature on the formation of oxidation film and decomposition behavior of titanium hydride is more significant than that of oxidation time, and the onset temperature and peak value of TiH2 decomposition shift from left to right through elevating temperature and extending time.

TL;DR: In this article, a small amount of Si has been added into the alloys to improve the electrochemical cycle stability of the RE-Mg-Ni-based A2B7-type electrode alloys.

TL;DR: Sorption characteristics of ion exchange resins as mentioned in this paper regarding rare earth metals (REM) during extraction from a barren solution of uranium sorption in dynamic conditions were investigated and it was identified that using desorption solution based on ammonium nitrate allows to achieve acceptable recovery degree of REM from the resin.

TL;DR: In this article, Ni45 was chosen as the transition layer and NiCr-Cr3C2 coating was indirectly cladded on 20Cr2Ni4A substrate to make the hardness increase gradually from substrate to coating surface.

TL;DR: In this article, the α + β → β phase transformation of Ti-1300 alloy was investigated using dilatometric method and the overall activation energy of the α+ β →β transformation of the alloy is 797 kJ·mol−1.

TL;DR: In this article, the optical basicity (L B ) of the CaO-SiO2 slag and the distribution coefficient of boron was investigated and the local minimum and maximum L B values of 0.72 and 1.58 were obtained when Λ = 0.56 and Λ= 0.71, respectively.

TL;DR: In this article, the microstructure and tribological properties of the composite coatings were investigated, and the results showed that the composite coating contained the phases of NiAl, Ni3Al, Al3Ni2, TiB2,TiB, TiC, CrB, and Cr23C6.

TL;DR: In this paper, the rare earth (RE) elements in CTMA were dissolved by HCl completely after alkaline fusion, and the relationship between the temperature and various properties of the compounds were examined by various techniques to elucidate their roles in the expected CTMA disintegration.

TL;DR: In this paper, a columnar grain and favorable orientation along axial direction of rods was investigated by electron backscattering diffraction, and the deviation is smaller than 10°.

TL;DR: In this article, the effects of isothermal holding process on the microstructure evolution of semi-solid 7075 strength aluminum alloy produced by the recrystallisation and partial remelting (RAP) process were investigated.

TL;DR: In this paper, a self-propagating high-temperature combustion synthesis with the pseudo-hot isostatic pressing process was employed to fabricate high-pure Ti3AlC2 (Φ 240mm).

TL;DR: By mineral liberation analyzer (MLA) automated quantitative system, the niobium-tantalum ore in this study was classified as refractory mineral of low-grade which was mainly composed of fergusonite, polycrase, ilmenorutile, and bastnasite as discussed by the authors.

TL;DR: In this article, the laser micro cladding deposition (LμCDM) is used to obtain the finer microstructures and the improved mechanical properties, and the results show that the components fabricated by LμCDm are fully dense free of cracks or pores and exhibit columnar prior β grains with a finer acicular α′ phase microstructure.

TL;DR: In this paper, a luminescent polystyrene microspheres were fabricated from poly (styrene-co-methacrylic acid) and aqueous RE(III) chloride solution (RE=Eu, Tb) in the presence of 2,2′-bipyridine as second ligand.

TL;DR: In this paper, a process of NaOH molten salt roasting and water leaching to treat titanium-vanadium slag obtained by direct reduction of titanomagnetite concentrates was investigated.

TL;DR: In this paper, the phase structure characteristics of high titanium slag were analyzed by means of energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM) analysis.

TL;DR: In this paper, the microstructure of Mg-Zn-RE (Gd, Y) alloys with different Gd/Y atomic ratios was studied by multiple means.