Production of Non-Equilibrium Transition Metal Fine Particles by Mechanical and Chemical Fragmentation

通过机械和化学破碎生产非平衡过渡金属细颗粒

• 批准号: 06452323
• 负责人: SUMIYAMA Kenji
• 金额: $ 4.86万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452323/
• 关键词: mechanical milling; leaching; ultrasonic fragmentation; nonequilibrium phase; metal particle; magnetism; hydrogel; thermal analysis; 非平衡微粒子; 強磁性体; EXAFS; メカニカル・アロイング; 遷移金属合金; 希土類金属合金

In this project, we tried to produce nonequilibrium metal and compound fine powders using the combined process of mechanical milling and chemical reaction, and observed their structures and magnetic properties. The following is the summary of our experimental results.1) Combined Process of Mechanical Milling and LeachingNonequilibrium precursory particles of Ni-Al, Mn-Al, Ru-Al, Ni-Fe-Al and Cu-Fe-Al were produced using mechanical milling. The main portion of Al was leached out of these milled powders in basic solution. The X-ray diffraction measurements indicate that the nonequilibrium structures, bcc Ni, alpha-Mn, bcc Ru, bcc Ni-Fe and bcc Cu-Fe, retain even after leaching, where Cu-Fe powders are highly oxidized. The DSC traces of these powderes show a exothermic peak owing to nonequilibrium-to equilibrium-phase transformation. Magnetic measurements indicate that bcc Ni and bcc Ru are paramagnetic, while alpha-Mn and bcc Ni-Fe(25at%Fe) are ferromagnetic. These results clearly demons … More trate formation of nonequilibrium phases.2) Enhanced Decomposion of Chemical Solution by Ultrasonic IrradiationPentacarbonyl, Fe(CO)_5 solutions in decane were irradiated using a high-intensity ultrasonic probe and sooty powders were obtained by filtereing and rinsing with dry pentane. The X-ray diffraction experiment show a halo pattern, indicating these powderes are amorphous-like. Magnetization of these powders is one order smaller than that of bulk Fe. This indicates insufficient decomposion of carbonyl solutions, being consistent with presence of C and O detected by the chemical analyzes.3) Homogeneous Complex Formation in Mixed Hydrogel by Mechanical MillingProcesses of complex formation between alumina and titania hydrogels was verified by X-ray diffraction, DSC, NMR and EXAFS.The Knight shift and symmetric to asymmetric change in the of ^<27>Al as well as modification of Ti-K edge EXAFS sepctra clearly demonstratethe chemical bonding, Al-O-Ti is formed during the millig process. Less

本课题尝试采用机械球磨和化学反应相结合的方法制备非平衡金属微粉和复合微粉，并对其结构和磁性进行了观察。1)机械球磨-浸出联合工艺用机械球磨法制备了Ni-Al、Mn-Al、Ru-Al、Ni-Fe-Al和Cu-Fe-Al等非平衡前驱体粒子。在碱性溶液中，Al的主要部分被从这些粉碎的粉末中浸出。X-射线衍射仪测量表明，浸出后仍存在体心立方Ni、α-Mn、体心立方Ru、体心立方Ni-Fe和体心立方Cu-Fe等非平衡结构，其中Cu-Fe粉末的氧化程度较高。这些粉末的DSC曲线显示出一个非平衡到平衡相变的放热峰。磁性测量表明体心立方的Ni和体心立方的Ru是顺磁性的，而α-Mn和体心立方的Ni-Fe(25at%Fe)是铁磁性的。这些结果显然让…心烦意乱2)超声强化化学溶液的分解用高强度超声波探头照射正庚烷中的五酮、Fe(CO)_5溶液，经过过滤和干戊烷漂洗，得到煤烟粉末。X-射线衍射实验显示出一种晕状，表明这些粉末是无定形的。这些粉末的磁化强度比块体Fe的磁化强度小一个数量级。用X-射线衍射仪、DSC、核磁共振和EXAFS分析证实了氧化铝和二氧化钛水凝胶之间形成络合物的过程。Al的奈克位移和对称到不对称的变化以及Ti-K边EXAFS的改变清楚地证明了Al-O-Ti的化学键是在微细化过程中形成的。较少

项目成果

Y. Kojima: "Comparison of Mechanical Complexation and Themal Behaviour of Metal, Oxide and Hydrogel Mixtures of the Al-Ti-O System," Int. J. Mechanochemistry and Mechanical Alloying. 1. 32-41 (1994)

Y. Kojima：“Al-Ti-O 系统的金属、氧化物和水凝胶混合物的机械络合和热行为的比较”，Int。

K. J. Kim: "Structure and Magnetic Properties of Mechanically Ground ε-Fe_<2.3>N" Jpn. J. Appl. Phys.33. 6539-6541 (1994)

K. J. Kim：“机械研磨 ε-Fe_<2.3>N 的结构和磁性”J. Appl. 33 (1994)。

Y.Kojima, T.Isobe, M.Senna, M.Sherif El-Eskandarany, K.Sumiyama and K.Suzuki: "Comparison of Mechanical Complexation and Thermal Behavior of Metal, Oxide and Hydrogel Mixtures of the Al-Ti-O System" Int. J.Mechanochemistry and Mechnical Alloying. 1. 32-41

Y.Kojima、T.Isobe、M.Senna、M.Sherif El-Eskandarany、K.Sumiyama 和 K.Suzuki：“Al-Ti-O 系统金属、氧化物和水凝胶混合物的机械络合和热行为比较

K. J. Kim: "Formation of Nanocrystalline and Amorphous Phases in Cu_<80>P_<20>, Ni_<82>P_<18> and Cu_<87>Ni_<13> Mechanically Alloyed Systems," J. Non-Cryst. Solids. 168. 232-246 (1994)

K. J. Kim：“Cu_<80>P_<20>、Ni_<82>P_<18> 和 Cu_<87>Ni_<13> 机械合金系统中纳米晶相和非晶相的形成”，J. Non-Cryst。

Y. Xu: "Nanocrystalline B2 Type Ru_<40>Al_<60> and Ru Powders Produced by Mechanical Alloying and Leaching," Nano Structured Materials. 4. 437-444 (1994)

Y. Xu：“通过机械合金化和浸出生产的纳米晶B2型Ru_<40>Al_<60>和Ru粉末”，纳米结构材料。