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J. Korean Ceram. Soc. > Volume 43(6); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(6): 338.
doi: https://doi.org/10.4191/kcers.2006.43.6.338
Lead-Borosilicate Glass계 LTCC용 유전체에 대한 고찰
윤상옥, 오창용, 김관수, 조태현, 심상흥1, 박종국1
강릉대학교 세라믹공학과
1강원대학교 삼척캠퍼스 전기공학과
Investigation on Lead-Borosilicate Glass Based Dielectrics for LTCC
Sang-Ok Yoon, Chang-Yong Oh, Kwan-Soo Kim, Tae-Hyun Jo, Sang-Heung Shim1, Jong-Guk Park1
Department of Ceramic Engineering, Kangnung National University
1Department of Electrical Engineering, Kangwon National University, Samcheok Campus
ABSTRACT
The effects of lead-borosilicate glass frits on the sintering behavior and microwave dielectric properties of ceramic-glass composites were investigated as functions of glass composition of glass addition ($10{sim}50vol%$), softening point (Ts) of the glass, and sintering temperature of the composites ($500{sim}900^{circ}C$ for 2 h). The addition of 50 vol% glass ensured successful sintering below $900^{circ}C$. Sintering characteristics of the composites were well described in terms of Ts. PbO addition in to the glass enhanced the reaction with $Al_{2}O_3$ to form liquid phase and $PbAl_{2}Si_{2}O_8$, which was responsible to lower Ts. Dielectric constant(${epsilon}_r$), $Q{times}f_0$ and temperature coefficient of resonant frequency (${tau}_f$) of the composite with 50 vol% glass contents ($B_{2}O_{3}:PbO:SiO_{2}:CaO:Al_{2}O_3$ = 5:40:45:5:5) demonstrated 8.5, 6,000 GHz, $-70;ppm/^{circ}C$, respectively, which is applicable to substrate requiring a low dielectric constant. When the same glass composition was applied sinter $MgTiO_3;and;TiO_2,;at;900^{circ}C$ (50 vol% glass in total), the properties were 23.8, 4,000 GHz, $-65ppm/^{circ}C$ and 31.1, 2,500 GHz, $+80ppm/^{circ}C$ respectively, which is applicable to filter requiring an intermidiate dielectric constant.
Key words: LTCC, Substrate, Glass-Ceramic, Lead-borosilicate, Dielectric constant
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