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Novel synthesis of single-crystalline TbCu_(7)-type Sm-Fe powder by low-temperature reduction-diffusion process using molten salt

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Journal of Rare Earths 2022年第7期40卷 1126-1133页

作者： Shusuke Okada Kenta Takagi Magnetic Powder Metallurgy Research Center National Institute of Advanced Industrial Science and Technology(AIST)2266-98 AnagahoraShimoshidami MoriyamaNagoya463-8560Japan

In this study,molten salt was used as a solvent for calcium(Ca)to let a reduction-diffusion(R-D)reaction occur below the melting point of Ca(1115 K),which is the lower limit temperature of the co nventional RD *** the R-D reaction is conducted below 923 K with LiCl molten salt,submicron-sized TbCu_(7)-type Sm-Fe powder is *** c/a ratio of the powder estimated by a synchrotron X-ray diffraction pattern is 0.8456,which is consistent with the Sm_(0.67)Fe_(5.667)(SmFe_(8.5))*** electron backscatter diffraction analysis reveals that single-crystalline TbCu_(7)-type SmFe_(8.5) powder was synthesized for the first time.

关键词： Reduction-diffusion TbCu_(7) Molten salt Permanent magnet Rare earths

Effect of microstructures on superplasticity of Al-11%Si alloy

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中国有色金属学会会刊：英文版 2007年第3期17卷 509-513页

作者：江静华马爱斌 N. SAITO A. WATAZU 林萍华 Y. NISHIDA Department of Materials Science and Engineering Hohai University National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora Shimoshidami Moriyama-ku Nago ya 463-8560 Japan

Three kinds of Al-11%Si (mass fraction) alloy samples with different processes were produced to investigate the effect of microstructures on its superplasticity. Among them, the as-ECAP sample pressed 16 passes has ultrafine grains (300 nm) and the finest secondary particles. The ECAP-T6 sample, with ECAP 16 passes followed by T6 treatment, has fine secondary particles (3 μm) but the largest grains (8 μm). Contrarily, the T6-ECAP sample, with T6 treatment followed by ECAP 16 passes, has ultrafine grains and the large secondary particles (7 μm). The tensile testing results show that the as-ECAP sample exhibits superplasticity at high strain rate of 5.75×10-1 s-1 due to its fine secondary particles and ultrafine grains. The ECAP-T6 sample, however, does not exhibit superplasticity at the same high strain rate of 5.75×10-1 s-1 because it has relatively large secondary particles and large grains. Remarkably, the T6-ECAP sample does not have superplasticity even at the lower strain rate of 1.15×10-1 s-1, attributing to its comparatively large secondary particles. When most secondary particles are larger than 7 μm, the high strain rate superplasticity could not be obtained even if this sample has ultrafine grains.

关键词：硅铝合金微结构粒子超塑性能

Corrosion behavior of hypereutectic Al-23%Si alloy (AC9A) processed by severe plastic deformation

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Transactions of Nonferrous Metals Society of China 2010年第2期20卷 195-200页

作者：江静华马爱斌宋丹 N. SAITO 袁玉春 Y. NISHIDA College of Materials Science and Engineering Hohai University Nanjing 210098 China National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora Shimoshidami Moriyama-ku Nagoya 463-8560 Japan

Ultrafine-grained(UFG) hypereutectic Al-23%Si (mass fraction) alloy was achieved through equal-channel angular pressing(EACP) procedure. And the electrochemical properties after various ECAP passes were investigated in neutral NaCl solution. Potentiostatic polarization curves show that the corrosion potential of the ECAPed sample after 4 passes decreases markedly, while the corrosion current density reaches 1.37 times that of the as-cast alloy. However, the φcorr and Jcorr values after 16 passes are improved and approach those of the as-cast alloy. Immersion tests also show that the mass-loss ratio of ECAPed alloy decreases with increasing the pressing pass, which is lowered to 28.7% with the increase of pass number from 4 to 16. Pitting susceptibility of the ECAPed alloy after initial 4 passes is boosted, due to the presence of biggish voids resulted from the breakage of brittle large primary silicon crystals during ECAP. Increasing ECAP pass makes the voids evanesce and results in the homogeneous ultrafine-grained structure, contributing to a higher pitting resistance. These results indicate that enough ECAP passes are beneficial to increasing corrosion resistance of the hypereutectic Al-23%Si alloy.

关键词： aluminum casting alloys ECAP corrosion behavior ultrafine grained microstructure

Enhanced biodegradation behavior of ultrafne-grained ZE41A magnesium alloy in Hank's solution

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Progress in Natural Science:Materials International 2013年第4期23卷 420-424页

作者： Fan Zhang Aibin Ma Jinghua Jiang Honglu Xu Dan Song Fumin Lu Yoshinori Nishida College of Mechanics and Materials Hohai University Jiangsu Collaborative Innovation Center of Advanced Micro/Nano Materials & Equipment 3. Changzhou Hohai Technology CO. LTD National Institute of Advanced Industrial Science and Technology 2266-98AnagahoraShimoshidamiMoriyama-ku

The biodegradation behavior of an ultrafne-grained(UFG) magnesium alloy ZE41A containing rare-earth(RE),obtained through multi-pass of equal channel angular pressing(EACP),was investigated by electrochemical measurements in Hank’s *** highest value of charge transfer resistance was obtained in the electrochemical impedance spectroscopy plots of the ECAPed samples with the largest pressing pass,while a movement of corrosion potential toward noble direction and a decrement of corrosion current density were observed in the potentiodynamic polarization curves of the ECAPed samples with further pressing *** results indicated that ECAP could be an effcient way to reduce the biodegradation rate of the ZE41A alloy.

关键词： Mg alloy ECAP UFG Hank’s solution Biodegradation

INFLUENCE OF ARGON GAS PRESSURE ON THE CRYSTALLINITY OF A-SIC EPITAXIAL FILMS FABRICATED BY ND: YAG PULSED-LASER DEPOSITION

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INFLUENCE OF ARGON GAS PRESSURE ON THE CRYSTALLINITY OF A-SI...

第8届国际材联电子材料国际研讨会

作者： Takeshi Kusumori Hachizo Muto National Institute of Advanced Industrial Science and Technology (AIST) Chubu 2266-98 Anagahora Shimoshidami Moriyama-ku Nagoya 463-8560 Japan

Silicon carbide (SiC) has attracted much attention as a wide band-gap semiconductor. Preparation of α-SiC epitaxial film is essential for electronic device application. Various techniques such as CVD, MBE and so forth are applied for fabricating the films. High-temperature (α-) type SiC (6H and 4H α-SiC) is formed above a transition temperature T～1600℃, therefore a deposition temperature above～1700℃is usually needed to prepare α-SiC epitaxial films by conventional vapor phase epitaxy methods. Recently we have

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考虑水蒸汽蒸发和冷凝的超声空化特性研究

高校化学工程学报 2015年第4期29卷 809-815页

作者：沈阳朱彤由美雁糜彬韩进谢元华李现瑾 Kyuichi Yasui 东北大学机械工程与自动化学院过程装备与环境工程研究所辽宁沈阳110004 National Institute of Advanced Industrial Science and Technology(AIST)2266-98 Anagahora ShimoshidamiMoriyama-kuNagoya 463-8560Japan

超声空化泡在溃灭时能够产生局部高温高压等极端物理化学效应。今在现有超声空化理论的基础上,考虑了水蒸汽的蒸发和冷凝效应,建立了超声空化动力学方程。文中采用数值方法,模拟了超声空化气泡运动状态参量变换规律。结果表明,不考虑水... 详细信息

超声空化泡在溃灭时能够产生局部高温高压等极端物理化学效应。今在现有超声空化理论的基础上,考虑了水蒸汽的蒸发和冷凝效应,建立了超声空化动力学方程。文中采用数值方法,模拟了超声空化气泡运动状态参量变换规律。结果表明,不考虑水蒸汽的蒸发冷凝时,气泡在溃灭时最高温度和最大压力分别为27944 K和9.9072 GPa;而考虑水蒸汽的蒸发冷凝时,其最高温度和最大压力分别为3303.7 K和2.2342 GPa。因此水蒸汽的蒸发和冷凝对超声空化过程具有不可忽略的影响。

关键词：超声空化水蒸汽蒸发冷凝

Adsorption and Photocatalytic Decomposition of Methylene Blue on Monodispersed Nanoparticles M2O5-nH2O Catalyst

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Adsorption and Photocatalytic Decomposition of Methylene Blu...

2～(nd) Spring Meeting of the International Society of Electrochemistry

作者： J.Wang K.Ozawa T.Nonami Ceramics Research Institute National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora shimoshidami Moriyama Nagoya 463-8586 Japan National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047.Japan Ceramics Research Institute National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora shimoshidami Moriyama Nagoya 463-8586 Japan

Photocatalytic oxidation and reduction reactions on the surface of TiO have been widelyinvestigated as an effective method to environmental purification and a potential method tosolve the energy issue since the Honda-Fujishima effect [1] was discovered. We are interestedin development of new semiconductor oxide photocatalysts which their photocatalyticreactions are more efficient than TiO under the solar light irradiation [2-3]. It is veryimportant to prevent the recombination of the photogenerated holes and electrons in order to

关键词： Adsorption and Photocatalytic Decomposition of Methylene Blue on Monodispersed Nanoparticles M2O5-nH2O Catalyst

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利用工业废料研制再生陶瓷初探(英文)

陶瓷学报 2005年第1期26卷 35-38页

作者： Nagae Hajime Suzuki Kazuo Sugiyama Toyohiko 2266-98 Anagahora ShimoshidamiMoriyamaNagoya 463-8560 Japan Materials Research Institute for Sustainable DevelopmentNational Institute of Advanced industrial Science and Technology(AIST)2266-98 AnagahoraShimoshidamiMoriyamaNagoya 463-8560 Japan Materials Research Institute for Sustainable DevelopmentNational Institute of Advanced industrial Science and Technology(AIST)2266-98 AnagahoraShimoshidamiMoriyamaNagoya 463-8560 Japan Materials Research Institute for Sustainable DevelopmentNational Institute of Advanced industrial Science and Technology(AIST)226698

为了材料的充分循环,实现可持续发展,研究人员对回收工业废料用做陶瓷原料的技术进行了探索。本文阐述了再生陶瓷的研发状况,介绍了其粉体制备、坯料、配方、成型和烧成工艺,同时还针对节能环保的要求,研究了降低烧成温度和缩短烧成周... 详细信息

为了材料的充分循环,实现可持续发展,研究人员对回收工业废料用做陶瓷原料的技术进行了探索。本文阐述了再生陶瓷的研发状况,介绍了其粉体制备、坯料、配方、成型和烧成工艺,同时还针对节能环保的要求,研究了降低烧成温度和缩短烧成周期的策略。回收废瓷粉、废玻璃粉、燃烧灰烬、废粘土、废赤泥(氧化铝工业废料)和粉煤灰等工业废渣,配成多种陶瓷坯料,并测试了各种坯料配方的物理特性,确定了每种配方的烧成温度。配方中添加废玻璃可以有效地降低烧成温度。研制出的一种再生陶瓷的可行性坯料配方是:80-20%废瓷粉,20-80%燃烧灰烬,30%废玻璃粉。坯料干压成型,经1100℃烧成后,吸水率为9.9%,体积密度为2.52g/cm3。该坯料配方可采用速烧工艺。

关键词：工业废料再生研制烧成温度坯料配方废玻璃粉可持续发展陶瓷原料研究人员研发状况粉体制备烧成工艺节能环保烧成周期工业废渣陶瓷坯料物理特性干压成型体积密度废瓷粉粉煤灰氧化铝吸水率回收灰烬

A Computation Model of Echo Avoidance in Human Audition

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A Computation Model of Echo Avoidance in Human Audition