- 學位論文
牙科用氧化鋯添加玻璃之燒結研究
A study on sintering of dental Y-TZP ceramics by using glass as additives
摘要
全瓷修復物在牙科領域上因具備高強度、耐磨耗性、優良的生物相容性和美觀而受到重視。近年來，由於釔安定氧化鋯陶瓷(Y-TZP)具優異的機械性能使它成為牙科修復物選用的材料。然而，此類的陶瓷通常經由高溫固態燒結製成，此法為較昂貴的製成方法且也會增加製作成本。 本研究主要使用MgO-CaO-Al2O3-SiO2-P2O5玻璃粉末作為添加劑，以降低Y-TZP的燒結溫度，並且評估玻璃對 Y-TZP之燒結與機械性質的影響。玻璃添加量分別為0、1、3、5、10 wt%，預燒結溫度為700、800 、900 ℃，緻密燒結溫度為1200 、1300 、1400 、1500 ℃。結果顯示，預燒結溫度為900 ℃有最佳切削性能，在1200 ℃下緻密燒結，添加5 %玻璃之氧化鋯其相對密度高達到94.8 %，除了700℃預燒結之試片外，XRD分析皆為t-ZrO2相，在1300℃下緻密燒結，添加3 %玻璃之氧化鋯有最佳的維氏硬度、彎曲強度值，分別為1098.9 HV、503.1 MPa。 由本實驗結果得知，以MgO-CaO-Al2O3-SiO2-P2O5玻璃作為添加劑，可有效幫助氧化鋯降低燒結溫度，並能在較低的燒結溫度達到適當的機械性質。
並列摘要
All-ceramic dental restorations are attractive to the dental community because of their higher strength, abrasion resistance, better biocompatibility, and aesthetics. Recently, Yttria stabilized tetragonal zirconia polycrystal(Y-TZP) is gaining recognition as a candidate material in dentistry owing to its excellent mechanical properties. However, these kinds of ceramics are usually fabricated via solid state sintering at high temperature, while it is a very expensive fabrication method and will inevitably increase the production cost. In this study, MgO-CaO-Al2O3-SiO2-P2O5 glass powders were introduced as additives to lower the sintering temperature of TZP and to evaluate the influence of glass additives on sintering and mechanical properties. Zirconia specimens containing 0, 1, 3, 5, 10 wt. % glass powders, respectively were presintered at 700, 800, 900 ℃ and sintered at 1200, 1300, 1400, 1500 ℃. The results indicate that the specimens presintered at 900 ℃ have an optimal cutting performance. The relative density with 5% glass additives achieved 94.8 % when sintered at 1200 ℃. X-ray diffraction patterns indicate that all specimens are tetragonal phase (t-ZrO2), except the specimen presintered at 700 ℃. The best mechanical strength was occurred with the specimen containing with 3 wt% glass when sintered at 1300℃. The hardness and bending strength were 1098.9 HV and 503.1 MPa, respectively. According to this work, the use of the MgO-CaO-Al2O3-SiO2-P2O5 glass as additives can decrease the sintering temperature of Y-TZP. The adapted mechanical strengths can be reached at relatively lower sintering temperatures.