Fabrication of bulk magnetic composite materials consisting of controlled nano-structures

由受控纳米结构组成的块体磁性复合材料的制造

• 批准号: 17360332
• 负责人: HIROTA Ken
• 金额: $ 9.44万
• 依托单位: Doshisha University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360332/
• 关键词: Composite materials. physical properties; Electronic and electric materials; Magnetic properties; Nano-structured materials; Ceramics; Interfaces

With aiming at developing new bulk magnetic materials having both high saturation magnetization density and high magnetic permeability for high-frequency electric applications, fabrication of MgFe_2O_4/Fe-Ni alloy bulk nano-composites, in which Fe-Ni grains (〜5μm in diameter) are fully surrounded with thin MgFe_2O_4layer (〜0.3μm in thick), has been tried: the former metal grains have high saturation magnetization density and the latter has high electric resistivity.The first stage, the best chemical compositions of MgFe_2O_4 have been investigated. Mg(Fe_<1-x>Mn_x)_2O_4 solid solution ferrites were prepared using both conventional solid reactions and sol-gel process, and their magnetic properties were measured precisely ; x=0.2 composition gave the best data. The second stage, plastic deformation of Mg(Fe_<1-x>Mn_x)_2O_4 ferrites were evaluated at temperature 1200 to 1350℃ in air.Finally MgFe_2O_4/Fe-Ni alloy bulk composites has been tried by adopting high-pressure sintering two powder … More s: Composite Powder I and Composite Powder II . The former was prepared as follows; fine MgO particle-coated Fe-Ni powders were heat-treated under various oxygen partial pressures at 600°and 700℃. The latter was fine MgO+a-Fe_2O_3 mixed powder particles-coated Fe-Ni powders. For the composite powders, two sintering processes were tried; i.e., pulsed-electric current pressure sintering PECPS (800℃/30MPa/3min) or HIP (950°-1250℃/196MPa/2h). Phase identification by XRD and SEM observation revealed that dense microstructure consisting of two phases (spinel MgFe_2O_4 and Fe-Ni alloy) was attained from the combination of composite powders II, PECPS and a re-oxidation process. However, other process resulted in formation of Wusteit phase of Mg_<1-x>Fe_xO and FeO in addition to Fe-Ni due to highly reductive atmosphere during the sintering. Thus obtained composite materials consisting two phases showed good magnetic properties at room temperature as expected from their compositions and microstructures: saturation magnetization density B_s of 1.20 T, and permeabilityμ〜15-30 at 1 MHz, and a Curie point above 460℃. Less

为了开发具有高饱和磁化强度和高磁导率的新型高频电子用块体磁性材料，制备了MgFe_2O_4/Fe-Ni合金块体纳米复合材料。（直径约为1.5 μm）的MgFe_2O_4薄膜完全包围（厚度约为0.3μm）的MgFe_2O_4陶瓷，前者具有高的饱和磁化强度，后者具有高的电阻率。采用<1-x>传统固相反应法和溶胶-凝胶法制备了Mg（Fe_ Mn_x）_2O_4固溶体铁氧体，并对其磁性能进行了精确的测量，x=0.2的组分得到了最佳的数据。第二阶段是Mg（Fe_<1-x>Mn_x）_2O_4铁氧体在1200 ~ 1350℃空气中的塑性变形，最后采用双粉高压烧结法制备了MgFe_2O_4/Fe-Ni合金块体复合材料 ...更多信息 S：复合粉末I和复合粉末II。前者的制备方法是：将MgO包覆Fe-Ni微粉在600°和700℃下进行不同氧分压的热处理。后者为MgO+a-Fe_2 O_3混合细粉颗粒包覆Fe-Ni粉。对于复合粉末，尝试了两种烧结工艺;即，脉冲电流加压烧结（PECPS）（800℃/30 MPa/3 min）或热等静压（HIP）（950°-1250℃/196 MPa/2 h）。XRD和SEM分析结果表明，复合粉末II与PECPS复合后，再经氧化处理，可获得由尖晶石MgFe_2O_4和Fe-Ni合金两相组成的致密组织。但在烧结过程中，由于<1-x>还原气氛的影响，除Fe-Ni相外，还形成了由Mg_ Fe_xO和FeO组成的Wusteit相。由此得到的两相复合材料在室温下表现出良好的磁性能：饱和磁化强度B s为1.20 T，磁导率μ s为15-30（1 MHz），居里点高于460℃。少

项目成果

Fabrication of carbon nanofiber(CNF)/SiAlON composites by pulsed electric-current pressure sintering and their mechanical and electrical properties

脉冲电流压力烧结碳纳米纤维（CNF）/SiAlON复合材料的制备及其力学和电学性能

• 发表时间: 2007
• 作者: K. Hirota;T. Shibata;M. Kato;T. i Nishimura
• 通讯作者: T. i Nishimura

Simultaneous synthesis and consolidation of carbon nanofiber(CNF)-dispersed composites by spark plasma sintering(SPS)

放电等离子烧结（SPS）同时合成和固结碳纳米纤维（CNF）分散复合材料

• 发表时间: 2007
• 作者: K. Hirota;H. Hara;T. Shibata;M. Kato;T. Nishimura
• 通讯作者: T. Nishimura

Low-temperature sintering of Mg(Fe_<1-x> Mn_x)_2O4(0≦x≦0.4) powders prepared via a citric acid route

柠檬酸法制备Mg(Fe_<1-x>Mn_x)_2O4(0≤x≤0.4)粉末的低温烧结

• 发表时间: 2008
• 期刊: Sci.& Eng.Rev.of Doshisha Univ. 49
• 作者: K.Hirota;K.Saruwatari;M.Kato;K.Nakade;M.Yoshinaga
• 通讯作者: M.Yoshinaga

Sintering and electric and magnetic properties of spinel-type Mg(Fe_<1-x>Mn_x)_2O4(0〓x〓0.4) powders prepared via a citric acid route

柠檬酸法制备尖晶石型Mg(Fe_<1-x>Mn_x)_2O4(0〓x〓0.4)粉末的烧结及电磁性能

• 发表时间: 2005
• 期刊: 1st International Symposium on Functional Materials, Kuala Lumpur, Malaysia C-2-6
• 作者: K. Hirota;Y. Shoda;K. Saruwatari;K. Nakade;M. Kato
• 通讯作者: M. Kato

Mn添加Mgフェライト[Mg(Fe_<1-x>Mn_x)_2O4(0≦x≦0.4)]の高温クリープ特性

掺锰镁铁氧体[Mg(Fe_<1-x>Mn_x)_2O4(0≤x≤0.4)]的高温蠕变性能

• 发表时间: 2007
• 作者: 猿渡 啓一;加藤 将樹;廣田 健;岡本 泰則
• 通讯作者: 岡本 泰則