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Magnetic Properties of Composite Amorphous Powder Cores

Published online by Cambridge University Press:  26 February 2011

Hong-Yow Chang ,
Pei-Chih Yao ,
Der-Ray Huang  and
Shu-En Hsu
Hong-Yow Chang
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and TechnologyP. O. Box 1-26-6, Lungtan, Taiwan 32500, Republic of China
Pei-Chih Yao
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and TechnologyP. O. Box 1-26-6, Lungtan, Taiwan 32500, Republic of China
Der-Ray Huang
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and TechnologyP. O. Box 1-26-6, Lungtan, Taiwan 32500, Republic of China
Shu-En Hsu
Affiliation:
Materials R&D Center, Chung Shan Institute of Science and TechnologyP. O. Box 1-26-6, Lungtan, Taiwan 32500, Republic of China
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Abstract

Composite amorphous powder core made by field-annealing with new insulations could improve the high frequency AC magnetic and mechanical properties. All of the amorphous ribbons with composition Fe78B16Si5C and Fe40Ni38Mo4B17Si were annealed at temperature higher than their embrittlement temperature but lower than the crystallization temperature. After the ribbons become brittle, they were mechanically crushed and milled to produce powders with size about 50 ∼ 250μm. To make a core, the amorphous powders combined with insulation binder were put into an evacuted toroidal followed by hot mechanical compaction. The weight percentages of binder were about 3 wt%, 5 wt% and 10 wt%. Field-annealings were carried out for different conditions in an Ar (or N2) atmosphere chamber at elevated temperature with applied field about 10 Oe. The initial magnetization curve and saturation magnetization were measured by vibrating sample magnetometer (O≤H≤10 KOe). DC and AC magnetic properties such as permeability, coercive force, core loss, etc. were tested by B-H loop tracer. It shows the AC properties can be improved by increasing the particle size of the amorphous powder and by increasing the interparticle contacts at high frequency.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 423
Copyright
Copyright © Materials Research Society 1987

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