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Materials 2019, 12(5), 824; https://doi.org/10.3390/ma12050824

Densification Mechanism of Soft Magnetic Composites Using Ultrasonic Compaction for Motors in EV Platforms

1
EV Components & Materials R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Korea
2
Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
3
Robotics and Virtual Engineering, Korea University of Science and Technology, Daejeon 34113, Korea
*
Author to whom correspondence should be addressed.
Received: 22 January 2019 / Revised: 28 February 2019 / Accepted: 3 March 2019 / Published: 11 March 2019
(This article belongs to the Special Issue Mechanical and Physical Properties of Metallic Composites)
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Abstract

In this paper, the densification mechanism of ultrasonic compaction was analyzed using a force balance model. Ultrasonic compaction is quite a promising way to solve the lower mechanical property problem of green compact in the compaction process, although it has some obstacles to overcome for its various applications. Our model proposes that the resultant density is achieved as the applied and resistance forces reach the equilibrium state. Based on the proposed model, the ultrasonic compaction increases the density of green compact by reducing the internal friction between the powder and compaction die, as well as the internal friction among particles themselves. It was also found that during the powder compaction, the ultrasonic vibration mostly contributes to slipping and the rearrangement of the particles. View Full-Text
Keywords: ultrasonic; compaction mechanism; internal friction reduction; SMCs (soft magnetic composites) ultrasonic; compaction mechanism; internal friction reduction; SMCs (soft magnetic composites)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hwang, M.-H.; Lee, H.-S.; Han, J.-H.; Kim, D.-H.; Cha, H.-R. Densification Mechanism of Soft Magnetic Composites Using Ultrasonic Compaction for Motors in EV Platforms. Materials 2019, 12, 824.

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