지르코니아-유리복합체용 글래스의 조성에서 MgO의 함량 변화가 강도에 미치는 영향
Effect of MgO addition in glass composition on the strength of zirconia-glass composites
이규선, 이창완, 이채현,
소속 상세정보
이규선 ( Lee Gyu-Sun ) - 동남보건대학 치기공과
이창완 ( Lee Chang-Wan ) - 배재대학교 재료공학과
이채현 ( Lee Chae-Hyun ) - 배재대학교 재료공학과
KMID : 0362120070290010024
Abstract
The quantity of MgO in the Zirconia of 20wt% Frit has been varied and the sintering temperature has been differentiated to monitor the changes in the mechanical features. The rise of sintering temperature from 1100 to 1300 was followed by higher sintering density. And, at a sintering temperature, the increase of the quantity of MgO was followed by lower sintering density. The bending strength has been lowered as the quantity of MgO increases in the Zirconia of 20wt% Frit, which seems to be because the MgO functions as impurities degrading the mechanical features. In terms of micro-structure analysis, the pore has been greatly enlarged, while the density varied very little, when the MgO of 3wt% was added. The size of pore became smaller as the added quantity of MgO increased larger in the sequence of 5wt% and 7wt%. But, the pore-generating rate became higher as the added quantity of MgO increased in the sequence of 3wt%, 5wt% and 7wt%. Thus, it is possible to summarize that the small quantity of MgO, say, of 3wt%, promotes the grain growth, and the large quantity of MgO, say, of 7wt%, hinders the grain growth. Also, if the quantity of MgO exceeds some level, the MgO hinders substances from moving, which, ultimately, keeps blowholes from becoming enlarged or extinct, and makes pores small and dispersed in broad area. In conclusion, the study on the change in the size of pore shows that the larger the quantity of MgO is, the more the micro pores are, thereby degrading the mechanical features.
키워드
Zirconia-glass;MgO;Strength
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