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

旨在开发具有高饱和度磁化密度和高频电动应用的高磁渗透性的新大量磁性材料，MGFE_2O_4/Fe-Ni合金散装纳米材料的制造，Fe-Ni晶粒（直径约为5μm）均匀地包围了MGFE_2O_2O_4 layerer（〜0.3μmmmmmmm）饱和磁化密度和后者具有高电阻性。第一阶段已经研究了MGFE_2O_4的最佳化学成分。 Mg（Fe_ <1-X> Mn_x）_2O_4使用常规的固体反应和Sol-Gel工艺制备固体溶液铁氧体，并准确测量其磁性。 x = 0.2组成给出了最佳数据。第二阶段，在1200至1350的温度下对Mg（Fe_ <1-X> MN_X）_2O_4的塑性变形进行了评估。通过使用高压力的sinter sister两种粉末，可以尝试使用高压力的MGFE_2O_4/Fe-Ni合金散装组成。前者的准备如下。在600°和700°的各种氧气压力下，将细Mgo颗粒涂层的Fe-Ni粉末进行热处理。后者是精细的MGO+A-FE_2O_3混合粉末颗粒涂层的Fe-Ni粉末。对于复合粉末，尝试了两个烧结过程。即，脉冲电流压力烧结PECP（800℃/30MPA/3min）或髋部（950°-1250℃/196MPA/2H）。通过XRD和SEM观察结果鉴定相位表明，由两个相（尖晶石MGFE_2O_4和Fe-Ni合金）组成的密集微观结构与复合粉II，PECPS和一个重新氧化过程的组合相连。但是，其他过程还导致Mg_ <1-X> Fe_xo和FeO的Wusteit相，除了Fe-Ni之外，由于烧结过程中的大气高度减少。获得的两个相组成的复合材料在室温下的组成和微观结构所预期显示出良好的磁性特性：饱和磁化密度B_S为1.20 t，在1 MHz时在1 MHz时透透性〜15-30，以及高于460℃的curie点。较少的

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
• 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