상용 이트리아 안정화 정방정 지르코니아 분말의 소결 물성

Abstract

Tetragonal zirconia polycrystals (Y-TZP) with 3 to 5 mol% of yttria are mainly used as a dental zirconia implant material. For good mechanical properties and thermal stability, high sintered density over 99.5% and the particle size under 0.3 ㎛ are required. In this study, commercially available 3Y-TZP powders for zirconia implants were analyzed, and investigated the sintered properties, for examples, phase composition, sintered density, and microstructural evolution. The primary particles and granules of the commercial 3Y-TZP powders showed the different morphology and size, depending on the powder manufacturing company, and powder type caused the difference of phase composition, sintered density and microstructure. After the sintering at 1500℃ for 2 hours, each specimen showed a particle size of 0.23~0.33 ㎛, which was suitable for implant materials, but the sintered density varied from 98.5% to 99.3%.