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유리의 조성에서 MgO, Li_2O의 함량변화가 유리침투 알루미나 세라믹 재료의 강도와 색조의 변화에 미치는 영향
배태성,원대희,원상용,윤여은 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.3
This study was performed to investigate the effect of composition changes in glasses on the strength and shade of glass-infiltrated alumina ceramics. Six different borosilicate glasses containing MgO, Li₂O and ZrO₂ in the glass composition were prepared, porous alumina compacts were prepared by slip casting and sintered at 1100℃ for 2 hours. Dense composites were made by infiltration of molten glass into partially sintered alumina at 1110℃ for 6 hours. Specimens were polished sequentially form #800 to #2000 diamond wheel, and the final surface finishing on the tensile side was received an additional polishing sequence through 0.3 ㎛ diamond paste. To evaluate the effect of composition change in glass on the shade changes of glass-infiltrated alumina core ceramics, the color was measured by the CIE L^*, a^*, b^* color scale relative to standard source C. The biaxial flexure strength was measured using the ball-on-three-ball method at a crosshead speed if 0.5mm/min. The color change of composites infiltrated with experimental glasses to In-Ceram Glass AL1 showed that L^* values increased but a^* and b^* values decreased with addition of MgO, Li₂O and ZrO₂ in the glass composition. Maximum color difference of experimental glass-infiltrated alumina core ceramics was obtained in the Group B containing 2.4 mol% MgO in the glass composition. The maximum biaxial flexure strength values 47.41 MPa was obtained in the Group E containing 0.3 mol% Li₂O in the glass composition. The observation of fracture surfaces indicated the microstructurally rough surface with a tendency of toughening by crack deflection and crack bridging.