A Study on Co-Firing of Multilayer Chip LC Filter by Control of Shrinkage

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J. Korean Ceram. Soc. > Volume 28(9); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(9): 675.

수축율 조절에 의한 적층 칩 LC Filter의 동시 소성에 관한 연구

김경용, 이종규, 김왕섭, 최환¹

한국과학기술원 세라믹스 재료연구단
¹한국쌍신전기주식회사

A Study on Co-Firing of Multilayer Chip LC Filter by Control of Shrinkage

ABSTRACT

Among many problems that need to be solved in the process of preparing multilayer chip LC filters, we studied the control of shrinkage in order to prevent the crack, warpage, and/or delamination which occurs at the interface between the inductance (L part) and the capacitance (C part). Shrinkage was controlled by compositions, powder size, calcining temperature and amount of organic binder. Capacitance sheet was prepared by mixing 65 wt% binder with the composition of 96 wt% TiO2 having an average particle size of 0.5 $mutextrm{m}$, 3 wt% CuO. After small amount of MnO2 and SiO2 added, it was calcined at 750$^{circ}C$ for 2 hr. Inductance sheet was prepared by mixing 60 wt% binder with the composition of 49.5% mol% Fe2O3, 20.5 mol% ZnO, 20 mol% NiO and 10 mol% CuO which was calcined at 775$^{circ}C$ for 2 hr. These sheets was laminated at 250 kg/$textrm{cm}^2$, and cofired at 900$^{circ}C$ for 2 hr to give rise to a multilayer chip LC filter without any warpage.