Rare Metals

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Mechanism of fracture toughness property of aging-hardening eutectic Al–Si alloys
Rare Metals - Tập 42 - Trang 2795-2800 - 2019
Tao Hong, Gang Zhao
The microstructures and fracture toughness properties of the aged Al–12.5Si–0.7Mg alloy plate were studied by transmission electron microscopy (TEM), optical microscopy (OM), tensile, and fracture toughness (the fracture toughness value, KIC) testing. The mechanism of fracture toughness properties of the alloys was discussed for different sizes of silicon particle and aging precipitates. The resul...... hiện toàn bộ
Electrochemical characteristics of amorphous MgTi x Ni (x = 0, 0.1, and 0.2) hydrogen storage alloys
Rare Metals - - 2010
Suqin Liu, Wenjuan Zhao, Kelong Huang, Hongfeng Huang
Sensing mechanism of Ag/α-MoO3 nanobelts for H2S gas sensor
Rare Metals - Tập 40 Số 6 - Trang 1545-1553 - 2021
Shi-Kai Shen, Xinlei Cui, Chuanyu Guo, Xin Dong, Xian‐Fa Zhang, Xiaoli Cheng, Li-Hua Huo, Yingming Xu
Electrochemical behavior of Co3O4 microspheres in aqueous LiOH solution
Rare Metals - Tập 30 - Trang 90-93 - 2011
Yan Liu, Xiaogang Zhang, Ying Wu
Co3O4 microspheres were synthesized in mass production by a simple hydrothermal treatment using trisodium citrate as a template. The pristine, discharged and recharged specimens were characterized by XRD, SEM and Raman spectroscopy measurements. The electrochemical behavior was studied by CV curves of Co3O4 at various scan rates in LiOH solution. Co3O4 particles underwent a reversible insertion of...... hiện toàn bộ
Synergistic effect of cobalt and niobium in Co3-Nb-Ox on performance of selective catalytic reduction of NO with NH3
Rare Metals - Tập 41 - Trang 166-178 - 2021
Bo-Lin Zhang, Li-Feng Deng, Bo Liu, Chun-Yun Luo, Michael Liebau, Shen-Gen Zhang, Roger Gläser
Combining the redox properties of Co and the acid properties of Nb in a Co3-Nb-Ox catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH3 (NH3-SCR). Co3O4 shows average activity, however, it exhibits a poor N2 selectivity. Nb2O5 is not active for NH3-SCR. However, the mixed Co3-Nb-Ox catalyst shows higher NO conversion and N2 selectivity than the singl...... hiện toàn bộ
Effects of electric parameters on microstructure and properties of MAO coating fabricated on ZK60 Mg alloy in dual electrolyte
Rare Metals - Tập 31 - Trang 172-177 - 2012
Jing Chen, Zexin Wang, Sheng Lu
Micro-arc oxidation (MAO) process was carried out in a dual electrolyte system of NaAlO2 and Na3PO4 on ZK60 Mg alloys to explore the effect of electric parameters including current density, frequency, duty cycle and oxidation time on the evolution of coatings and other characteristics. The microstructural characteristics of coatings were observed by scanning electron microscopy (SEM) combined with...... hiện toàn bộ
Microstructure and thermal properties of copper matrix composites reinforced with titanium-coated graphite fibers
Rare Metals - Tập 32 - Trang 75-80 - 2013
Hao-Ming Zhang, Xin-Bo He, Xuan-Hui Qu, Qian Liu, Xiao-Yu Shen
Milled form of mesophase pitch-based graphite fibers were coated with a titanium layer using chemical vapor deposition technique and Ti-coated graphite fiber/Cu composites were fabricated by hot-pressing sintering. The composites were characterized with X-ray diffraction, scanning/transmission electron microscopies, and by measuring thermal properties, including thermal conductivity and coefficien...... hiện toàn bộ
Study of ultrahigh-purity copper billets refined by vacuum melting and directional solidification
Rare Metals - Tập 30 - Trang 304-309 - 2011
Yabo Fu, Jie Chen, Ning Liu, Yiping Lu, Tingju Li, Guomao Yin
The purpose of this paper is to study large-sized copper billets refined with 5N ultrahigh purity after vacuum melting and directional solidification (VMDS). The precise impurity analysis of copper billets was carried out with a glow discharge mass spectrometer (GDMS). The results demonstrate that the total concentration of twenty-two impurities is decreased by 63.1wt.%–66.5 wt.%. Ag, P, S, Na, Mg...... hiện toàn bộ
Semisolid forging electronic packaging shell with silicon carbon-reinforced copper composites
Rare Metals - Tập 32 - Trang 191-195 - 2013
Kai-Kun Wang
To fabricate electronic packaging shell of copper-matrix composite with characteristics of high thermal conductivity and low thermal expansion coefficient, semisolid forming technology, and powder metallurgy was combined. Conventional mechanical mixing of Cu and SiC could have insufficient wettability, and a new method of semisolid processing was introduced for billets preparation. The SiC/Cu comp...... hiện toàn bộ
Electric field manipulation of magnetic skyrmions
Rare Metals - - 2022
Ya-Dong Wang, Zhi-Jian Wei, Hao-Ran Tu, Chen-Hui Zhang, Zhi-Peng Hou
Magnetic skyrmions are vortex-like swirling spin textures that are promising candidates for carrying information bits in future magnetic memories or logic circuits. To build skyrmionic devices, researchers must electrically manipulate magnetic skyrmions to enable easy integration into modern semiconductor technology. This operation generally uses a spin-polarized current, which unavoidably causes ...... hiện toàn bộ
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