| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | A. 전자/반도체 재료 분과 |
| 제목 | Crystallization behavior of Cordierite (Mg2Al4Si5O18) Glass-ceramic and their microwave/mm-wave dielectric properties |
| 초록 | For applications in microwave/mm-wave wireless communication devices, dielectric ceramic materials are requested to have low dielectric constant(εr) and high-quality factor (Q) to minimize time delay and high signal selectivity. Furthermore, for integrated electronic components, low-temperature sinterability of the ceramics needs to be achieved to co-process with highly conductive metal electrodes. Crystalline cordierite (Mg2Al4Si5O18), which has a low εr~5 and high Q, is considered as a promising material for the millimeter-wave application. However, cordierite has a low sinterability caused by high sintering temperature (＞1300°C) and incongruent melting at 1460°C. In this study, the cordierite-based glass-ceramic system was explored to achieve low-temperature densification with excellent dielectric properties at high frequencies. The nano-sized amorphous cordierite particles were prepared by a two-step process of sol-gel method and hydrothermal synthesis at 240°C. The amorphous cordierite was sintered at below 900°C, and dense microstructures with nano-grains were obtained. In the crystallization study, annealing temperature and times, which were acted as crystallization variables, were adjusted to obtain glass-ceramic, and the phase formation, including α-cordierite with μ-cordierite, was identified at each step. Dielectric properties of the crystalized cordierite ceramics at microwave and mm-wave frequencies were analyzed. |
| 저자 | 권석은, 성우준, 김정윤, 권도균 |
| 소속 | 한국항공대 |
| 키워드 | microwave; mm-wave; cordierite; glass-ceramic; crystallization |
