Papers by Keyword: Amorphous Alloy

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Authors: Zeng Zin Li, Guo Ming Wang, Wen Jun Li
Abstract: Furfuryl alcohol is an important organic chemical material. The traditional catalysts of furfural hydrogenation to produce furfuryl alcohol contain Cr, which is harmful to people’s health and causes severe environmental pollution. Developing new highly active catalysts in furfuryl alcohol is of great practical significance. The progress of non-chrome catalysts for hydrogenation of furfural to produce furfuryl alcohol has been reviewed. Some environmental-friendly non-chrome catalysts, such as copper catalysts, CuO-CaO/SiO2 catalysts, Cu-Zn-Al catalysts, load Ni and ultra-fine Ni-B amorphous alloy catalysts, had been discussed and their preparations and structure characterizations were described. Some constructive strategies are presented for the research and applications of such catalysts.
Authors: Shubhra Mathur, Rishi Vyas, S.N. Dolia, Kanu Sachdev, S.K. Sharma
Abstract: Corrosion studies were carried out using potentiodynamic polarization method on amorphous, nanocrystalline and crystalline states of the alloy Ti60Ni40 in 0.5 M H2SO4 and 0.5 M HNO3 aqueous media at room temperature. The nanocrystalline state of Ti60Ni40 was obtained by removing about 10 μm from the air side surface (crystalline state) by polishing. The presence of nanocrystalline phase was confirmed by X-ray diffraction (XRD). It was found from polarization results that the corrosion current density was higher in the amorphous state than in the nanocrystalline state in both 0.5 M H2SO4 and 0.5 M HNO3 aqueous media. These results are corroborated by the weight loss studies which were carried out in both of these media. Results are discussed in the paper in the light of data reported in the literature on similar type of alloys.
Authors: Hyoung Seop Kim, Sun Ig Hong, Min-Seok Sohn
Authors: Heyun Zhao, Xing Hui Wu, Qing Ju Liu, Jin Zhong Xiang, Zuo Quan Liu
Authors: Yan Ping Shi
Abstract: In order to solve some problem of stress sensor in dynamic weigh rail, a new kind of inductive stress sensor based on magnetostriction effect of amorphous alloy was developed. First, the principle of sensor, and inferred its output equation were discussed. Second, the static characteristic experiment and the actual experiment on the material testing machine and the mine haulage rail were separately made. The results of the test have showed that this stress sensor has some characteristics as high measurement sensitiveness and accuracy. Also being simple, convenient and solid to install and use, so it is feasible to apply the sensor for the dynamic weigh rail.
Authors: Yu Ying Zhu, Qiang Li, Yun Hua He, Ge Wang, Xing Hua Wang
Abstract: A new quaternary amorphous alloy powder Ti50Fe22Ni22Sn6 are prepared by mechanical alloying. The milling was performed under an argon atmosphere in a high-energy planetary ball mill. After milled 70h, fully amorphous Ti50Fe22Ni22Sn6 powders can be obtained, with the condition of the milling speed, 300rpm, and the weighs ratio of ball to powder, 10:1. Crystal structure of the milled powders is investigated by XRD. Thermal analysis show that when the heating rate increasing from 10K/min to 40K/min, the super-cooled liquid region of milled amorphous alloy increased from 93K to 110K.
Authors: Zhong Yuan Suo, Jian Jun Chen, Yan Ling Song, Ke Qiang Qiu
Abstract: A new Ti-based amorphous alloy Ti35Zr21Cu40Si4 with about 80 μm thickness and 5~8 mm width was fabricated by melt spinning method. The phase structure and thermal stabilities of the Ti35Zr21Cu40Si4 amorphous alloy were investigated by the X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. The Ti35Zr21Cu40Si4 amorphous alloy was cultivated in the simulate body fluid (SBF) for 15 days. And the blood compatibility was evaluated by dynamic clotting time and hemolysis rate test. The Ti35Zr21Cu40Si4 alloy exhibits fully amorphous phase and high thermal stability with a supercooled liquid region (ΔTx) of 80K. The Ca phosphates depositions on alloy surfaces were gained after 15 days. Moreover, n (Ca)/n (P) atom ratio of the deposition is about 1.65/1, which approaches to that of human bone 1.66/1, suggesting that the Ti35Zr21Cu40Si4 amorphous alloy is with an excellent biocompatibility. The Ti35Zr21Cu40Si4 amorphous ribbon has lower hemolysis ratio of 0.562%, which can reduce wrecking degree of erythrocytes, compared with medical standards of the hemolysis rate (less than 5%). These are favorable for application to biomaterials.
Authors: Aurel Raduta, Mircea Nicoară, Cosmin Locovei
Abstract: A research program has been completed in order to analyze structural changes during heating of amorphous alloys belonging to Fe-Ni-P system. Special attention has been given to thermodynamics and mechanism of crystallization, to determine some aspects of development for crystalline phases. Experimental material used to determine characteristics of crystallization consisted in long ribbons, 30 thick and 18 mm wide, fabricated by mean of “Planar Flow casting” as amorphous Fe42Ni38P16B4 alloy. Differential Thermal Analysis (DTA) and X-rays diffraction have been used to determine crystallization temperature of this alloy. Curves of differential thermal analysis for heating rates ranging between 1°C/minute and 20 °C/minute have been used to determine activation energy of crystallization.
Authors: Kazumasa Yamada, M. Ito, Masaaki Tatsumiya, Yoshiaki Iijima, Kazuaki Fukamichi
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