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.

本论文的研究分为两个部分：一是添加剂低温烧结锰锌铁氧体的研究进展，二是金属/氧化物复合材料的研究进展。用介质搅拌磨粉碎共沉淀粉，制得了具有结构变形的亚微米级颗粒(~0.18μm)的高烧结性锰锌铁氧体粉末。在氮气气氛中加热900℃可以制备出致密的纯锰锌铁氧体(约为理论值的98%)。其磁导率μ为5 2 0~6 35，电阻率ρ为0.8~1.6Ω·m。在铁氧体中加入少量的硼硅酸锂玻璃，可获得较高的μ=1015和ρ=474Ω·m，玻璃加入量为0.1wt%时，铁氧体的μ为900wt/12h，ρ为474Ω·m。采用放电等离子烧结技术，在850μ℃和130 Mpa的条件下，在空气中烧结5min，获得了由超细晶(86.5Fe-6Si-4Al-3.5Niwt%)和镁铁氧体(75/25%)组成的致密复合材料(占理论的98.6%)。它们的饱和磁化强度B_5为1.2T，电阻率ρ为1×10~(-2)Ω·m，在1 kHz处的磁导率为μ&gt；1000。在超Sendust(~30μm)大球晶的晶界处有细小的铁氧体颗粒(~0.6μm)，并制备了连续梯度的超·Sendust/Mg·铁氧体材料，并对其性能进行了研究。

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)

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, 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。

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)

T.Aoyama, K.Hirota, O.Yamaguchi, Y.Aono, and N.Matsutani: "Characterization and Low-Temperature Sintering of Reactive Mn-Zn Ferrite Powder"J.Am.Ceram.Soc.. 79 [10]. 2792-94 (1996)

T.Aoyama、K.Hirota、O.Yamaguchi、Y.Aono 和 N.Matsutani：“活性锰锌铁氧体粉末的表征和低温烧结”J.Am.Ceram.Soc. 79 [10]。