Effects of powder properties and processing on soft magnetic performance of stainless steel

In recent years, innovative magnetic materials have been introduced in the field of electrical machines. In the ambit of soft magnetic materials, laminated steels guarantee good robustness and high magnetic performance but, in some high-frequency applications, can be replaced by Soft Magnetic Composite (SMC) materials. SMC materials allow us to reduce the eddy currents and to design innovative 3D magnetic circuits. In general, SMCs are characterized at room temperature, but as electrical machines operate at high temperature (around 100 °C), an investigation analysis of the temperature effect has been carried out on these materials; in particular, three SMC samples with different binder percentages and process parameters have been considered for magnetic and energetic characterization.

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Preparation and magnetic performance optimization of FeSiAl/Al2O3–MnO–Al2O3 soft magnetic composites with particle size adjustment

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-021-07355-7 ◽

2021 ◽

Author(s):

Zigui Luo ◽

Bo Feng ◽

Dingya Chen ◽

Zhenjia Yang ◽

Shangwei Jiang ◽

...

Keyword(s):

Particle Size ◽

Performance Optimization ◽

Soft Magnetic ◽

Magnetic Composites ◽

Magnetic Performance ◽

Soft Magnetic Composites ◽

Size Adjustment

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Combinatorial surface coating and greatly-improved soft magnetic performance of Fe/Fe3O4/resin composites

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2019.122478 ◽

2020 ◽

Vol 242 ◽

pp. 122478 ◽

Cited By ~ 1

Author(s):

Bingyang Meng ◽

Bai Yang ◽

Xixiang Zhang ◽

Bohui Zhou ◽

Xiaopan Li ◽

...

Keyword(s):

Surface Coating ◽

Resin Composites ◽

Soft Magnetic ◽

Magnetic Performance ◽

Combinatorial Surface

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316L Stainless Steel Powders for Additive Manufacturing: Relationships of Powder Rheology, Size, Size Distribution to Part Properties

Materials ◽

10.3390/ma13235537 ◽

2020 ◽

Vol 13 (23) ◽

pp. 5537

Author(s):

Robert Groarke ◽

Cyril Danilenkoff ◽

Sara Karam ◽

Eanna McCarthy ◽

Bastien Michel ◽

...

Keyword(s):

Particle Size ◽

Stainless Steel ◽

Additive Manufacturing ◽

Optical Microscope ◽

Stainless Steel 316L ◽

Powder Morphology ◽

Size And Shape ◽

Powder Rheology ◽

Powder Properties ◽

Particle Size And Shape

Laser-Powder Bed Fusion (L-PBF) of metallic parts is a highly multivariate process. An understanding of powder feedstock properties is critical to ensure part quality. In this paper, a detailed examination of two commercial stainless steel 316L powders produced using the gas atomization process is presented. In particular, the effects of the powder properties (particle size and shape) on the powder rheology were examined. The results presented suggest that the powder properties strongly influence the powder rheology and are important factors in the selection of suitable powder for use in an additive manufacturing (AM) process. Both of the powders exhibited a strong correlation between the particle size and shape parameters and the powder rheology. Optical microscope images of melt pools of parts printed using the powders in an L-PBF machine are presented, which demonstrated further the significance of the powder morphology parameters on resulting part microstructures.

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Hybrid Phosphate-Alumina Iron-Based Core-Shell Soft Magnetic Composites Fabricated by Sol-Gel Method and Ball Milling Method

Metals ◽

10.3390/met10020257 ◽

2020 ◽

Vol 10 (2) ◽

pp. 257

Author(s):

Yifan Pan ◽

Liwei Qian ◽

Xiang Wang ◽

Jingguang Peng ◽

Wei Lu

Keyword(s):

Ball Milling ◽

Eddy Current ◽

Loss Factor ◽

Sol Gel ◽

Core Loss ◽

Eddy Current Loss ◽

Soft Magnetic ◽

Magnetic Composites ◽

Magnetic Performance ◽

Soft Magnetic Composites

Novel Fe-based soft magnetic composites (SMCs) with hybrid phosphate-alumina layers were prepared by both sol–gel and ball-milling methods. The effects of the fabrication methods and the addition of Al2O3 particles on the microstructure and the soft magnetic performance of SMCs were studied. The formation of the hybrid phosphate-Al2O3 shell not only leads to the decrease of the total core loss, but also results in the reduction of the permeability and saturation magnetization. However, the degree of decrease caused by the different methods were not identical. The sample with 8% Al2O3 prepared by the sol–gel method showed the best magnetic performance, exhibiting a high-amplitude permeability (μa) of 85.14 and a low total core loss (Ps) of 202.3 W/kg at 50 mT and 100 kHz. The hysteresis loss factor and the eddy current loss factor were obtained by loss separation. The results showed that the samples with the same Al2O3 content prepared by different methods exhibited almost the same total core loss. However, the contribution of the hysteresis loss and the eddy current loss showed an obvious difference in behavior because of the change of the particle shapes and the refinement of the particle size during the ball-milling process.

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Soft magnetic stainless steel resists corrosion

Anti-Corrosion Methods and Materials ◽

10.1108/acmm.1999.12846cab.005 ◽

1999 ◽

Vol 46 (3) ◽

Keyword(s):

Stainless Steel ◽

Soft Magnetic

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Effects of powder properties on mechanical properties of injection moulded stainless steel

Metal Powder Report ◽

10.1016/s0026-0657(99)80093-9 ◽

1998 ◽

Vol 53 (12) ◽

pp. 36

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Powder Properties

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Machinability Improvement on High Speed Ultrasonic Turning - The Effect of Tool Oscillating Direction and Tool Chip Shape

Materials Science Forum ◽

10.4028/www.scientific.net/msf.874.302 ◽

2016 ◽

Vol 874 ◽

pp. 302-307

Author(s):

Keisuke Hara ◽

Ryo Sasaki ◽

Hiromi Isobe

Keyword(s):

Surface Roughness ◽

Stainless Steel ◽

Processing Speed ◽

High Speed ◽

Principal Direction ◽

Cutting Speed ◽

Soft Magnetic ◽

Chip Shape ◽

Fine Surface ◽

Ultrasonic Cutting

Ultrasonic cutting is a technique that can improve machinability such as fine surface, reduce tool worn out and etc. To improve processing speed of ultrasonic cutting is difficult due to the effects of tool oscillation are invalidated when cutting speed exceeds maximum tool oscillating velocity. In previous report, high speed principal direction ultrasonic turning experiments for stainless steel were carried out to improve processing speed and products quality. In ultrasonic turning, tool worn out and built up edge generation were reduced compare with ordinary turning. In this study, the effects of tool oscillating direction and tool chip shape for cutting properties of soft magnetic stainless steel were investigated. Cutting properties such as turned surface roughness, cutting force and ejected chip were compared.

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