Abrasive Wear Caused by EMC Particles

Liaw, Yow Ching; Chou, Jung-Hua

doi:10.4028/www.scientific.net/amr.126-128.559

Cited by 1 publication

(1 citation statement)

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“…The metal debris in the molding compounds can originate from several sources such as metals in the raw materials or those generated during the manufacturing process [3]. The latter situation typically occurs because EMCs are thermosetting materials and presently silica is the most common EMC filler with a large weight percentage of approximately 75%.…”

Section: Introductionmentioning

confidence: 99%

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

2017

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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.

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Section: Introductionmentioning

confidence: 99%