Glycothermal법을 이용한 심미치과 보철재료용 ZrO2와 3Y-ZrO2 분말의 합성 및 구조적 성질 = Synthesis and structural properties of ZrO2 and 3Y-ZrO2 powders as a esthetic dental prosthesis materials by the glycothermal method

다국어 초록 (Multilingual Abstract)

The zirconia(ZrO2) and yttria partially stabilized zirconia(3Y-ZrO2) nanopowders were synthesized by glycothermal method with various reaction temperatures and times. The precipitated precursor of pure zirconia and 3 mol%-yttria doped zirconia (3Y-ZrO2) was prepared by adding NH OH to starting solutions, and then put into an autoclave reactor. The optimal experimental conditions such as reaction temperatures and times, the amounts of stabilizer Y2O3 were carefully studied. The synthesized ZrO2 and 3Y-ZrO2 powders were characterized by XRD, SEM, TG-DTA. When the temperature was increased to 200℃, the pure ZrO2 powder synthesized by glycothermal method was identified as a mixture of monoclinic and tetragonal phase. However, the 3 mol%-yttria doped zirconia powder was obtained the only stable tetragonal phase at glycothermal temperature of above 200℃. To observe phase transition, the pure ZrO2 and 3Y-ZrO2 powders were heat treated from 00 to 00℃. The pure ZrO2 at heat treatment of above 800℃ was completely occurred phase transition from mixture phase to monoclinic. However, the 3 mol%-yttria doped zirconia was appeared the stable tetragonal phase after that heat treatment.
The result of this study therefore should be considered 3Y-ZrO2 powders prepared by glycothermal method as a dental materials.

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