Fabrication and Evaluation of Composite Magnetic Materials

复合磁性材料的制备与评价

• 批准号: 09450248
• 负责人: HIROTA Ken
• 金额: $ 7.74万
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09450248/
• 关键词: Mn-Zn ferrite; low-temperature sintering; additives; B_2O_3 (boron oxide); lithium silicate glass; Super-Sendust; Mg-ferrite; Spark plasma sintering; 傾斜機能材料; 微小X線回折; 残留応力; 磁性材料; アグネシウムフェライト; センダスト; Ni-Zn-フェライト; Mn-Zn-フェライト; ガラス

The present study is based on two parts : one deals with the development of low-temperature sintering Mn-Zn ferrite with additives and the other is concerned with metal/oxide composite materials. Highly sinterable Mn-Zn ferrite powder consisting of submicrometer-size particles (〜0.18μm) with structural distortion has been prepared by grinding a coprecipitated powder with a media agitation mill. Dense pure Mn-Zn ferrites (>98% of theoretical) can be fabricated by heating at 900℃ in a nitrogen atmosphere. They show magnetic and electric properties in which their permeability μ and electric resistivity ρ are 520-635 and 0.8-1.6Ω・m, respectively. These properties have been further improved by adding a small amount of lithium borosilicate glass ; especially, high values of μ=1015 and ρ=474Ω・m are achieved in ferrites (900℃/12h) with 0.1wt% glass addition. The microstructures consist of large grains (〜35μm) with high resistive layers at grain boundaries.Dense composite materials (98.6% of theoretical) consisting of Super-Sendust (86.5Fe-6Si-4Al-3.5Ni wt%) and MgFe_2O_4 (75/25 vol%) have been fabricated by spark plasma sintering in air for 5 min at 850℃ and 130 MPa. They exhibit a high saturation magnetization density B_5 of 1.2 T and high electrical resistivity ρ of 1×10^<-2>Ω・m. Permeabilities μ>1000 at 1 kHz are obtained. Fine ferrite grains (〜0.6 μm) are located at the boundaries of the large spherical grains of Super Sendust (〜30 μm).Furthermore, continuously graded Super・Sendust/Mg・ferrite materials have been fabricated and their properties are under investigation.

本研究基于两个部分：一种涉及添加剂的低温烧结Mn-Zn铁氧体的发展，另一种涉及金属/氧化物复合材料。高度可烧毁的Mn-Zn铁素粉由亚微米大小的颗粒（〜0.18μm）组成，并通过与媒体搅动厂磨成共沉淀的粉末来制备结构失真。密集的纯Mn-Zn铁氧体（> 98％的理论）可以通过在氮气中的900℃加热来制造。它们显示出磁性和电性能，其中其渗透率为μ和电抗性ρ分别为520-635和0.8-1.6Ω・M。通过添加少量硼硅酸盐玻璃，可以进一步改善这些特性。特别是，高值= 1015和ρ=474Ωm在铁氧体（900℃/12H）中实现，并增加0.1Wt％玻璃。微观结构由大谷物（〜35μm）组成，在晶界处具有高耐药层。密度的复合材料（占理论上的98.6％）由超级sendust（86.5Fe-6-Si-4al-3.5ni wt％）组成MPA。它们表现出1.2 T的高饱和磁化密度B_5，高电阻ρ向1×10^<-2> ω・m。获得1 kHz时的渗透率μ> 1000。细铁矿晶粒（〜0.6μm）位于超级散发器（〜30μm）的大球形晶粒的边界上。FURTHERMORE，连续分级的超级・Strust/mg ・铁矿材料已制造，其性能正在研究中。

项目成果

Hirota et al.: "Microstructure and Magnetic and Electric Properties of Low-Temperature Sintering Mn-Zn Ferrites without and with Addition of Lithium Borosilicate Glass"J.Mag.Mag.Mater.. 205. 283-89 (1999)

Hirota 等人：“添加和添加硼硅酸锂玻璃的低温烧结锰锌铁氧体的微观结构和磁电性能”J.Mag.Mag.Mater.. 205. 283-89 (1999)

K.Hirota, T.Aoyama, S.Enomoto, M.Yoshinaka, and O.Yamaguchi: "Microstructures and Magnetic and Electric Properties of Low-Temperature Sintering Mn-Zn Ferrites without and with Addition of Lithium Borosilicate Glass"J.Mag.Mag.Mater.. 205. 283-89 (1999)

K.Hirota、T.Aoyama、S.Enomoto、M.Yoshinaka 和 O.Yamaguchi：“添加和添加硼硅酸锂玻璃的低温烧结锰锌铁氧体的微观结构和磁电性能”J.Mag。

Y.Aono, N.Matsutani, T.Aoyama, K.Hirota, and O.Yamaguchi: "Improvement of Magnetic and Electric Properties of Low-Temperature Sintering Mn-Zn Ferrite by Adding B_2O_3"Mater.Sci.Res.Int'l.. 2 [4]. 275-76 (1996)

Y.Aono、N.Matsutani、T.Aoyama、K.Hirota 和 O.Yamaguchi：“通过添加 B_2O_3 改善低温烧结锰锌铁氧体的磁电性能”Mater.Sci.Res.Intl

K.Hirota, Y.Takano, M.Yoshinaka, and O.Yamaguchi: "A New Composite Material with High Saturation Magnetization Density and High Electrical Resistivity"Mat.Res.Bull.. 35 [5]. 1137-41 (2000)

K.Hirota、Y.Takano、M.Yoshinaka 和 O.Yamaguchi：“一种具有高饱和磁化密度和高电阻率的新型复合材料”Mat.Res.Bull.. 35 [5]。

Aoyama et al.: "Electric and Magnetic Properties of Low-Temperature Sintering Mn-Zn Ferrite by Addition of Lithium Borosilicate Glass"J.Mater.Sci.Lett.. 18. 363-65 (1999)

Aoyama 等人：“通过添加锂硼硅酸盐玻璃实现低温烧结 Mn-Zn 铁氧体的电和磁性能”J.Mater.Sci.Lett.. 18. 363-65 (1999)