牙科全瓷材料3Y-TZP粉体粒度对烧结性能与微观结构的影响

Effects of Particle Size on Sintering Properties and Microstructure of 3Y-TZP.

目的:探讨不同粉体粒度对全瓷材料3Y-TZP烧结性能与微观结构的影响。方法:选取不同粒度的A、B两种高纯纳米3Y-TZP材料,采用模压成型,常压烧结工艺制备试件,然后采用Archimedes法测量烧结线收缩率,气孔率,吸水率,计算体积密度,相对密度等烧结性能指标,并检测试件的微观形貌和物相组成。结果:以B粒度纳米粉制备的3Y-TZP陶瓷材料的烧结温度为1500℃,相对密度98.7%,比A粒度纳米粉制备的材料烧结温度低100℃左右,致密度高1.2%,且色泽优于A粉体烧结试件;微观结构上B材料烧结体晶粒细小,均匀致密,少见气孔、微裂纹等缺陷相;物相组成上,B材料纳米粉烧结试件断面的应力诱发相变所导致的四方相含量变化率也高于A材料烧结试件。结论:纳米粉体B制备的试件烧结温度较低,烧结性能优于A粉体制备的试件,微观结构均匀致密,断裂相变率较高,提示B纳米粉体制备的3Y-TZP材料更适宜作为全瓷桥的支架材料。

Objective： To study the effects of particle size on sintering properties and microstructure of 3Y-TZP for choosing the better one used as all-ceramic dental material especially for framework of multi-unit posterior bridges. Methods： A＆B nano-sized powders of 3Y-TZP were dry -pressed and sintered at certain range of ending temperature. Sintering properties were measured by Archimedes method. Microstructure and crystalline phase composition were analyzed by SEM and XRD apparatus. Results： Nano -3Y -TZP powder B could be sintered at 1500℃ which was lower than 3Y-TZP powder A by 100℃. Microstructure of specimens sintered by nano-sized powder B was finer and more condensed, with more t-m phase transformation than specimens by powder A wheu fractured. Conclusion ： Nano-sized powder B of 3Y-TZP could be sintered at lower temperature with higher density and better gloss than powderA. Material made of nano-sized 3Y -TZP powder B is promising as all ceramic dental materials, especially for framework of multi -unit posterior bridges.