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저온소결 세라믹기판용 Cordierite계 결정화유리의 합성 및 특성조사에 관한 연구;(II) $CeO_2$를 첨가한 Cordierite계 결정화유리의 특성
이근헌,김병호,임대순,정재현 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.10
The effects of CeO2 on the properties of cordierite-based glass-ceramics and its applicability to low firing temperature substrate were examined. Glass-ceramics were prepared by sintering the glass powder compacts at 900~100$0^{\circ}C$ for 3 h. Density, bending strength, dielectric constant and thermal expansion coefficient of the glass-ceramics were measured as functions of CeO2 contents and sintering temperatures. By adding CeO2, dense glass-ceramics were obtained below 100$0^{\circ}C$. dielectric constant and bending strength were more dependent on the porosity of glass-ceramics containing 5 wt% CeO2, sintered at 100$0^{\circ}C$ for 3 h, were as follows; relative density is 95.3%, bending strength is 178$\pm$11 MPa, dielectric constant is 4.98$\pm$0.20 (at 1 MHz) and thermal expansion coefficient is 33.7$\times$10-7/$^{\circ}C$. Therefore, the glass-ceramics containing 5 wt% CeO2 appeared to be suitable for low firing temperature substrate of electronic devices.
저온소결 세라믹 기판용 Cordierite계 결정화유리의 합성 및 특성조사에 관한 연구: (I) $MgO-Al_2O_3-SiO_2$계 유리분말의 결정화 및 수축거동
이근헌,김병호,임대순 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.6
Dense glass-ceramics for low firing temperature substrate were prepared by addition of CeO2 flux to the glass of MgO-Al2O3-SiO2 system. Glass powders were fabricated by melting at 150$0^{\circ}C$ and ball milling. Glass powder compacts were sintered at 800~100$0^{\circ}C$ for 3h. The crystallization and the shrinkage behaviors of glass powder compacts were analyzed by XRD, DTA and TMA. The shrinkage of glass powder compact increased with increasing the amount of CeO2. Because the softening temperature decreased and the crystallization temperature increased with increasing the amount of CeO2. Apparently, addition of CeO2 prevented formation of $\mu$-cordierite phase from the glass-ceramics and improved formation of $\alpha$-cordierite phase. Therefore crystallization properties were enhanced.
저온소결 세라믹기판용 Cordierite계 결정화 유리의 합성 및 특성조사에 관한 연구;(III) Tape casting에 의한 기판 제조
김병호,문성훈,이근헌,임대순 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.10
Low firing temperature substrate were synthesized through tape casting and sintering of glass with cordierite composition and then their properties were investigated. Even though the dielectric properties and XRD patterns of substrates, obtained by tape casting and sintering at 900~100$0^{\circ}C$ for various periods, were similar to those of substrates obtained by dry pressing, the sinterability was enhanced. The substrates were thin and the size was 0.6$\times$50$\times$50mm. From the results of dielectric properties, the sinterability and X-ray diffraction pattern, the proper condition for cofiring process with conductor, Cu, was 90$0^{\circ}C$ for 1h. The properties of the substrate are as follows; the dielectric constant was 5.31(at 1MHz), the dissipation factor was 0.0028, the apparent porosity was 0.28% and the main crystalline phase was $\alpha$-cordierite.