*Seong-Min Jeong1, Yong-Jin Kwon1, Si-Young Bae1, Jae-Hwan Pee2, Younghee Kim1, Won-Jae Lee3, Soonil Lee4
(1. Inst. of Ceramic Eng. and Tech.(Korea), 2. Inst. of Ceramic Eng. and Tech. Icheon branch(Korea), 3. Department of Advanced Materials Engineering, Dong-Eui Univ.(Korea), 4. School of Materials Science and Engineering, Changwon National Univ.(Korea))