Layer separation behavior in Ni-Zn-Cu ferrite green sheets with using poly (Butyl methacrylate) copolymer

Shi Yeon Kim, Dong Hun Yeo, Hyo Soon Shin, Ho Gyu Yoon

Research output: Contribution to journalArticle

Abstract

The increasing use of NFC antennae in mobile phones has led to the increase in usage of ferrite sheets. In accordance with the trend for mobile terminals to be high intensity and to have thinner layers, and the need for high-strength materials that can withstand external shocks has increased In this study, the manufacturing process of the green sheet was optimized by using PVB and acrylate binder in the ferrite sheet fabrication process. In this process, a skin forms on the sheet surface in the acrylate binder drying process. This phenomenon was determined to be caused by non-uniform drying due to the high Peclet number of the acrylate binder. In order to resolve this skin problem in the drying process, change in Tg was induced by varying the plasticizer content in the binder. Its relationship with the layer separation phenomenon was defined. As a result, layer separation was reduced by increasing the P/B ratio, and fabrication of a uniform sheet was possible when the P/B ratio was 0.5. Also, layer separation was reduced when using a binder of lower molecular weight among the various acrylate binders. This result was in good agreement with the reported effects related to the Peclet number. Furthermore, changes in the binder distribution state within the sheet, binder adhesion condition, and mechanical properties of the green sheet were observed according to the P/B ratio variation.

Original languageEnglish
Pages (from-to)555-559
Number of pages5
JournalJournal of Ceramic Processing Research
Volume16
Issue number5
Publication statusPublished - 2015

Fingerprint

Binders
Ferrite
Copolymers
Drying
Peclet number
Skin
Plasticizers
Fabrication
poly(butyl methacrylate)
Mobile phones
Adhesion
Molecular weight
Antennas
Mechanical properties
acrylic acid

Keywords

  • Acrylate binder
  • Green sheets
  • Layer separation
  • Ni-Zn-Cu ferrite
  • Skin effect

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Layer separation behavior in Ni-Zn-Cu ferrite green sheets with using poly (Butyl methacrylate) copolymer. / Kim, Shi Yeon; Yeo, Dong Hun; Shin, Hyo Soon; Yoon, Ho Gyu.

In: Journal of Ceramic Processing Research, Vol. 16, No. 5, 2015, p. 555-559.

Research output: Contribution to journalArticle

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