The influence of MgO addition on the densification and microstructure of alumina (Al2O3) was studied. Compacted alumina specimens were manufactured using ball-milling and one-directional pressing followed by sintering at temperatures below 1700oC. Relative density, shrinkage, hardness, and microstructure were investigated using analytical tools such as FE-SEM, EDS, and XRD. When the MgO was added up to 5.0 wt% and sintered at 1500oC and 1600oC, the relative density exhibited an average value of 97% or more at both temperatures. The maximum density of 99.2% was with the addition of 0.5 wt% MgO at 1500oC. Meanwhile, the specimens showed significantly lower density values when sintered at 1400oC than at 1500oC and 1600oC owing to the relatively low sintering temperature. The hardness and shrinkage data also showed a similar trend in the change in density, implying that the addition of approximately 0.5 wt% MgO can promote the densification of Al2O3. Studying the microstructure confirmed the uniformity of the sintered alumina. These results can be used as basic compositional data for the development of MgOcontaining alumina as high-dielectric insulators.

1. 서 론
2. 실험 방법
3. 결과 및 토론
    3.1 MgO의 함량 및 소결 온도에 따른 밀도 변화
    3.2 MgO의 함량 및 소결 온도에 따른 결정 구조 분석
    3.3 MgO의 함량 및 소결 온도에 따른 미세구조 분석
4. 결 론
감사의 글

• 김리주(성신여자대학교 청정융합에너지공학과) | Ri Joo Kim (Department of Environment & Energy Engineering, Sungshin University, Seoul 01133, Republic of Korea)
• 정한결(성신여자대학교 청정융합에너지공학과) | Han Gyeol Jeong (Department of Environment & Energy Engineering, Sungshin University, Seoul 01133, Republic of Korea)
• 손예지(성신여자대학교 청정융합에너지공학과) | Ye Ji Son (Department of Environment & Energy Engineering, Sungshin University, Seoul 01133, Republic of Korea)
• 고상기(코닉스 기술연구소) | Sang Ki Ko (R&D center, KO-NICS, Anseong 17554, Republic of Korea)
• 홍현선(성신여자대학교 청정융합에너지공학과) | Hyun Seon Hong (Department of Environment & Energy Engineering, Sungshin University, Seoul 01133, Republic of Korea) Corresponding Author