Electric insulation of a FeSiBC soft magnetic amorphous powder by a wet chemical method: Identification of the oxide layer and its thickness control

被引：59
作者：
Nakahara, S. [1 ,2 ]
Perigo, E. A. [1 ,3 ]
Pittini-Yamada, Y. [1 ]
de Hazan, Y. [3 ]
Graule, T. [3 ]
机构：
[1] Empa, Swiss Fed Labs Mat Sci & Technol, Adv Mat Proc, CH-3602 Thun, Switzerland
[2] Univ Tokyo, Grad Sch Frontier Sci, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan
[3] Empa, Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland
来源：
ACTA MATERIALIA | 2010年 / 58卷 / 17期
关键词：
Amorphous materials; Oxidation; Powder processing; Soft magnets; Saturation magnetization; COMPOSITE-MATERIALS; SURFACE OXIDATION; ALLOYS; MOTOR;
D O I：
10.1016/j.actamat.2010.06.044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An electrical insulating layer formed on the surface of an Fe79.3Si5.7B13.3C1.7 soft magnetic amorphous powder was characterized and its layer thickness was evaluated. The insulating layer was prepared by chemical oxidation of the powder in 10% nitric acid-ethanol solution. The insulating layer mainly consisted of magnetite and/or maghemite. Moreover, the insulating layer avoided further oxidation up to T approximate to 940 K, which is above the crystallization temperature of the amorphous powder. A correlation of the layer thickness with density and saturation magnetization is presented and discussed. Layer thicknesses calculated either from density or saturation magnetization of either magnetite or maghemite were in good agreement with each other. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：5695 / 5703
页数：9
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