Title :
Fabrication and characterization of glass-ceramic+Al2O3 composition for LTCC(low temperature co-fired ceramic)
Author :
Lim, Mi-Hwa ; Park, Jeong-Ho ; Kim, Ho-Gi ; Yoo, Myung-Jae
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
The glass+ceramic compositions for LTCC dielectric materials have been investigated. The glass+ceramic mixtures consist of cordierite based crystallizable glass (MgO-Al2O3-SiO2-GeO2), Al2O3 as a filler and zinc borate as a sintering additive. The GAZ series had superior characteristics to GA series. Densification was almost finished in GAZ series (glass+Al2O3+zinc borate) after sintering at 850°C, while in GA series (glass+Al2O3) it was finished after sintering at 900°C. Especially the loss tangent of GAZ series was much lower than that of GA series. GAZl sintered at 900°C showed promising microwave properties having the Qf (quality factor×frequency in GHz) of 5594.9 and a dielectric constant of 5.92 at 8.4 GHz.
Keywords :
Q-factor; aluminosilicate glasses; densification; dielectric losses; dielectric materials; germanate glasses; glass ceramics; magnesium compounds; microwave materials; permittivity; sintering; 8.4 GHz; 850 degC; 900 degC; MgO-Al2O3-SiO2-GeO2-ZnB2O3; crystallizable glass; densification; dielectric constant; dielectric materials; glass ceramic Al2O3 preparation; glass ceramic Al2O3 properties; glass-Al2O3-zinc borate; loss tangent; low temperature co-fired ceramic; microwave properties; sintering; Ball milling; Ceramics; Crystallization; Dielectric measurements; Fabrication; Glass; Scanning electron microscopy; Surface cracks; Temperature; Zinc;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218528
