MATEC Web Conf.
Volume 130, 2017The International Conference on Composite Material, Polymer Science and Engineering (CMPSE2017)
|Number of page(s)||5|
|Section||Composites of metal and ceramic materials|
|Published online||25 October 2017|
Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets
1 Department of Engineering Science, National Cheng Kung University, Tainan, 70101, Taiwan
2 Department of Electronic Engineering, Minghsin University of Science and Technology, Hsinchu, 30401, Taiwan
a Corresponding author: firstname.lastname@example.org
During the preparation of thermosetting encapsulation molding compounds (EMCs) for semiconductor packaging, metal debris are always present in the EMC powders due to the hard silica fillers in the compound. These metal debris in the EMC powders will cause circuit shortage and therefore have to be removed before molding. In this study, Nd-Fe-B permanent magnets are used to remove these debris. The results show that the metal debris can be removed effectively as the rate of accumulation of the metal debris increases as time proceeds in the removing operation. The removal effectiveness of the debris is affected by both the magnetic flux density and the flow around the magnet. The wake flow behind the magnet is a relatively low speed recirculation region which facilities the attraction of metal debris in the powders. Thus, the largest amount of the accumulated EMC powders occurs downstream of the magnet. Hence, this low speed recirculation region should be better utilized to enhance the removal efficiency of the metal debris.
© The authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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