A study on sintering of dental Y-TZP ceramics by using glass as additives

• Main Authors: Yun-Fen Peng, 彭韻芬
• Other Authors: Shih-Ching Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/zj385m

碩士 === 中臺科技大學 === 醫學工程暨材料研究所 === 97 === 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.