Research on Preparation and Properties of Fe-Si-Al Soft Magnetic Composites

The Fe-Si-Al soft magnetic composites were produced by cold pressing of water-atomized Fe-Si-Al powder using organic binder. The effect of shaping pressure, annealing temperature, magnetic annealing and dielectric content on properties of Fe-Si-Al soft magnetic composites was investigated. The results showed that increasing shaping pressure increases density and radial crushing strength of Fe-Si-Al soft magnetic cores, and decreases coercivity and total loss. Increasing annealing temperature can increase effective permeability and decrease total loss owing to decreasing hysteresis loss, and over-annealing (＞660°C) can deteriorate magnetic properties. The magnetic annealing can decrease total loss of Fe-Si-Al magnetic powder core. Increasing dielectric content can reduce the eddy current loss of Fe-Si-Al magnetic powder core and decrease the real part of permeability. Fe-Si-Al magnetic powder core with shaping pressure of 1800 MPa, annealing temperature of 660 °C and dielelctric content of 0.7% presented the optimum magnetic properties with an effective permeability of 127, a total loss of 78mW/cm3 and a radial crushing strength of 18MPa.

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FeSiAl Powder Core Coated by Ba-B-P-O System Insulating Layer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.303-306.2469 ◽

2013 ◽

Vol 303-306 ◽

pp. 2469-2472

Author(s):

Ding Wei ◽

Xin Wang ◽

Z K Feng ◽

R Z Gong

Keyword(s):

Annealing Temperature ◽

Compaction Pressure ◽

Thin Layers ◽

Total Loss ◽

Soft Magnetic ◽

Magnetic Composites ◽

Insulating Layer ◽

X Ray ◽

Soft Magnetic Composites ◽

Magnetic Powder Core

Sendust soft magnetic composites coated by a thin Ba-B-P-O system insulating layer were produced; SEM spectroscopy and Energy dispersive X-ray analysis spectroscopy confirmed that thin layers of Ba-B-P-O system covered the alloy powders. The influence of various compaction pressures on composites permeability, DC properties and total loss was investigated. The Fe-Si-Al magnetic powder core with compaction pressure of 1932MPa, annealing temperature of 953K with a permeability of 94, a total loss of 108 mW/cm3.

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Influence of Compaction Pressure on Magnetic Properties of Sendust Powder Core

Materials Science Forum ◽

10.4028/www.scientific.net/msf.852.79 ◽

2016 ◽

Vol 852 ◽

pp. 79-83

Author(s):

Ru Wu Wang ◽

Feng Quan Zhang ◽

Ding Wei ◽

Ze Min Fang ◽

Chun Zeng ◽

...

Keyword(s):

Magnetic Properties ◽

Alloy Powder ◽

Power Loss ◽

Effective Permeability ◽

Annealing Temperature ◽

Compaction Pressure ◽

Magnetic Powder ◽

Soft Magnetic ◽

Dc Bias ◽

Quality Factor Q

Toroid-shaped soft magnetic powder cores (SMCs) were produced by cold pressing of the commercial sendust alloy powders. The characteristics of the commercial sendust alloy powder and the effect of compaction pressure on the magnetic properties, i.e., effective permeability μe, quality factor Q, DC-bias properties and volume power loss of sendust alloy powder cores were investigated. The results showed that the sendust alloy powder core with shaping pressure of 1932 MPa, annealing temperature of 953 K for 1 h and dielectric content of 0.96% presents the optimum magnetic properties with an effective permeability of 90, a total loss of 386 mW/cm3 at f=50 kHz and Bm=0.1 T, a DC-bias property of 64% at H=50 Oe.

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Annealing effects on magnetic properties and strength of organic-silicon epoxy resin-coated soft magnetic composites

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406213515112 ◽

2013 ◽

Vol 228 (12) ◽

pp. 2049-2058 ◽

Cited By ~ 20

Author(s):

Ling Xiao ◽

Yanhua Sun ◽

Chunhua Ding ◽

Lihua Yang ◽

Lie Yu

Keyword(s):

Magnetic Properties ◽

Epoxy Resin ◽

Strength Analysis ◽

Soft Magnetic ◽

Magnetic Composites ◽

Coating Materials ◽

Maximum Heat ◽

Iron Powders ◽

Organic Silicon ◽

Soft Magnetic Composites

Soft magnetic composites (SMCs) can be described as soft magnetic powders covered by electrically insulating layers. In this work, iron powders with high purity and organic-silicon epoxy resin were chosen for good magnetic properties, thermal stability, and mechanical properties, respectively. The effect of amount of resin, different annealing temperatures on the microstructure, and performance of SMCs was investigated. Results show that organic-silicon epoxy resin has excellent properties as dielectric coating materials for coating iron powders and maximum heat-resistant temperature is about 400 ℃. According to magnetic properties and flexural strength analysis, the optimum annealing temperature of organic-silicon epoxy resin-coated composite is 200 ℃. Furthermore, the finite element analysis indicates that the strength of the whole composites is related to the adhesion of resin and iron and the strength of resin itself.

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